This document discusses biomechanical principles of human motion. It covers topics such as kinetics, kinematics, Newton's laws of motion, forces, levers, and stability. Key points include:
- Kinetics deals with forces causing movement, while kinematics involves time, space, and mass aspects of motion.
- Newton's first law states an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force.
- Torque is the tendency of a force to cause rotation, and is equal to the force magnitude multiplied by the distance from the axis of rotation.
- Stability depends on the relationship between an object's center of gravity and its base of support
The document provides a review of literature on motor control assessment. It discusses various aspects of motor control assessment including history taking, functional activity assessment, body structure and function assessment, outcome measures, and evaluation of specific areas like stability, mobility, strength, range of motion, and functional activity status. It also summarizes various studies that have evaluated methods and tools for motor control assessment like use of dynamometers, goniometers, and activity monitors.
Biofeedback machines commonly used in the physiotherapy practice are described along with available evidences for clinical use.
Most of the feedback modalities are described along with its use and the mechanism behind it.
22- Force platform- is the device used to measure the ground reaction forces in steady and/or in moving phase. Sensors in the force platform give visual feedback on the screen attached to therapist as well as patient about the weight distribution and other parameters of gait can also be measured.
33- Mirror -used as visual feedback to treat the pain as well as disability in different conditions. It healps to activate the mirror neuron in the brain. Mirrior therapy proposed by Ramchandran et al has been found most beneficial treatment in the phantom limb pain treatment
The document discusses disablement, its process, and common models used to describe it. It defines disablement and outlines Nagi, ICIDH, and ICF models of the disablement process. These models progress from pathology and impairment at the tissue/organ level to functional limitation and disability at the personal level to participation restrictions at the societal level. The document also discusses how therapeutic exercise can impact different levels of the disablement process by reducing impairments and improving function. Common physical therapy impairments, limitations, activity categories, and risk factors are also outlined.
- Centripetal force is the force required to move an object in a circular path with constant speed. It acts towards the center of the circular path.
- An object moving in a circular motion experiences centripetal acceleration even if its speed is constant, because its direction is continuously changing.
- Centripetal acceleration is the acceleration produced in circular motion by the centripetal force. It is calculated as v^2/r, where v is the object's speed and r is the radius of the circular path.
This document outlines the key topics to be covered in the BIOE 3200 biomechanics course for Fall 2015. Students will learn to define and distinguish between kinematics, which describes motion without regard to causes, and kinetics, which analyzes the forces that cause motion using Newton's laws. The course will teach how to draw free body diagrams, apply equations of motion, and use kinematic relationships to solve biomechanics problems involving subjects extending their legs as quickly as possible.
This document outlines the physiotherapy management for obstetric brachial plexus injury. It involves initial rest, followed by gentle range of motion exercises to maintain flexibility and strength. Specific exercises target the shoulder, elbow, wrist and hand. Positioning and splinting are also used to prevent contractures while allowing the involved arm to function. Sensory re-education helps address any loss of sensation. The overall goals are to maintain range of motion, muscle suppleness and strength, prevent contractures, and maximize functional recovery of the affected arm.
Here discuss some important bio mechanical aspects of the orthosis we use use in daily physio-therapeutic rehabilitation.
We also discuss the principles under which all the orthosis works. references are various articles from pubmed. For furthur read refer Atlas of orthosis and assistive aids.
This document discusses angular kinetics and its application to human movement. It provides explanations of key concepts such as torque, moment of force, moment arm, and inertia. Examples are given to illustrate how these principles can be used to analyze human motions like sprinting starts, gymnastic skills, and strength testing positions. Key points covered include definitions of torque and inertia, factors that influence torque magnitude, and how to calculate and sum torques at joints to determine net torque and equilibrium.
This document discusses the center of gravity (COG) and its importance in human movement and sports performance. It defines the COG as the point where the entire mass of an object can be considered to be concentrated and balanced. The location of the human body's COG depends on limb positioning and can change with movement. Maintaining stability is important in many sports and depends on factors like base of support and the distance between the COG and the edge of the support. Two methods for calculating a person's COG are described: the reaction board method and the segmental method.
Gait, Phases of Gait, Kinamatics and kinetics of gait
Intended for BPT 1st year undergraduate students.
Acknowledgement: Swathi Ganesh, my classmate during MPT prepared the slide which I modified for the purpose of teaching students.
This presentation is detail about Volta therapy which is commonly used in paediatric neurological conditions and also for adults. this presentation explains what are the various techniques, methods of application of Volta therapy, indications, contraindications, etc.
This document discusses ethics in physiotherapy. It outlines seven principles of ethics: selflessness, integrity, objectivity, accountability, openness, honesty, and leadership. It also discusses moving from an "ethics of trust" to an "ethics of rights" approach. Some ethical issues in physiotherapy are discussed like using uncalibrated equipment or treating certain patients. The four main principles of ethics - nonmaleficence, beneficence, justice, and respect for autonomy - are also outlined. The document concludes with guidelines for ethical behavior and sources for further information on physiotherapy ethics.
Biomechanics is the study of mechanics as they relate to living organisms, especially to human movement and sports activities. Biomechanists use tools like video analysis, force platforms, and wind tunnels to analyze human performance, the causes of injuries, and ways to optimize sports equipment and techniques. The goals of biomechanics are to improve sports performance, prevent injuries, design better equipment, and develop training methods to transfer skills from practice to competition.
Various types of muscle imbalance occurs in human body due to either articular, fascial or neural causes. as described by Janda this slide show elaborates on the same aspect and also differentiates two schools of thoughts on muscle imbalance, its assessment and treatment in the view of physiotherapy.
This document discusses the biomechanics of posture. It defines posture as the relative arrangement of body parts in relation to gravity. There are static and dynamic types of posture. The biomechanics of posture involves analyzing the kinetics and kinematics of all body segments. Perfect posture reduces stress on muscles and joints. However, the erect human posture is less stable than quadrupedal postures due to a smaller base of support and the location of the center of gravity being further from the base. Proper balance and control of posture depends on compensating for forces from gravity and maintaining stability of individual body segments and the whole body.
1) The sit-to-stand movement involves raising the body from a sitting to standing position and requires coordination of limbs to transfer weight while maintaining balance.
2) Individuals with knee osteoarthritis display different movement strategies during sit-to-stand, such as greater muscle co-contraction, earlier hamstring activation, and reduced hip and knee range of motion.
3) Altered movement strategies in osteoarthritis are thought to compensate for pain and weakness, helping to accomplish the task while protecting the affected knee joint.
First-year BPO - Biomechanics. here are the essential notes required to understand basic biomechanics regarding the human body and the forces acting on it.
This document discusses mechanical advantage in exercise and describes the three classes of levers. It defines key terms like moment, moment arm, force couple, and mechanical advantage. It explains that first class levers have the fulcrum between the input and output forces, second class levers have the output between the fulcrum and input, and third class levers have the input between the fulcrum and output. Most skeletal muscles act as third class levers, allowing for rapid movement with little muscle shortening. The document also covers centripetal force.
The document discusses different positions related to gravity and their effect on muscles. Against gravity positions involve moving a limb upwards perpendicular to the floor, opposing the force of gravity. Gravity eliminated positions involve moving a limb parallel to the floor, where the force of gravity is perpendicular. Gravity assisted positions involve moving downwards perpendicular to the floor, where gravity aids the movement. Simplified, movements can be parallel or perpendicular to the floor, with perpendicular movements either towards or away from the floor.
The document discusses different positions related to gravity and their effect on muscles. Against gravity positions involve moving a limb upwards perpendicular to the floor, opposing the force of gravity. Gravity eliminated positions involve moving a limb parallel to the floor, where the force of gravity is perpendicular. Gravity assisted positions involve moving downwards perpendicular to the floor, where gravity aids the movement. Simplified, movements can be parallel or perpendicular to the floor, with perpendicular movements either towards or away from the floor.
Train the trainer class presentation 2019 ( week 3 biomechanics )
This document provides an overview of biomechanics and human motion terminology in 3 parts:
1. It introduces biomechanics and the subfields of kinematics and kinetics. It describes different types of motion including rotary, translatory, and curvilinear.
2. It discusses fundamental movements in the sagittal, frontal, and transverse planes. It also covers anatomical locations and terminology used to describe human motion.
3. It explains forces including motive, resistive, and isometric muscle actions. It discusses the roles of agonists, antagonists, and synergists. It concludes with the importance of stability and mobility in different parts of the body.
This document discusses muscle and skeletal physiology, including:
- The relationship between stability and mobility, and how losing harmony between the two increases injury potential.
- Classifications of muscle types (voluntary vs involuntary) and fascicle patterns (pennate vs fusiform).
- Principles of biomechanics related to levers, force, resistance, and movement mechanics.
- Concepts like ligament creep and hysteresis - how applying constant stress over time can elongate ligaments and tendons.
- The document discusses the biomechanics and pathomechanics of the elbow joint. It describes the ligaments of the elbow, the articulations between the humerus, ulna, and radius, and the range of motion of the elbow joint. It also examines the muscles that flex, extend, pronate, and supinate the forearm, discussing their attachments, actions, innervation, and the effects of joint positioning on their function. Key concepts covered include torque, moment arms, classes of levers, and the screw home mechanism of the elbow.
The document discusses key concepts in biomechanics including:
- Characteristics of linear, angular, and general motion.
- Centre of gravity and how it can change depending on body position.
- Line of gravity and base of support in relation to stability.
- Newton's laws of motion and how they apply to human movement.
- Force summation and how multiple body parts can work together to maximize force.
- Projectile motion principles like gravity, speed, height, and angle of release that influence how objects are thrown or projected.
The document discusses postural control and balance, defining it as the ability to control body position in space. It describes static and dynamic postural control, and notes an intervention program should be based on an accurate evaluation. The summary provides exercises to improve postural alignment, control of movement, adaptation to tasks/environments, and fall prevention. A balance training program incorporates steady state, anticipatory and reactive exercises focusing on static and dynamic postural control.
Knee joint anatomy, biomechanics, pathomechanics and assessmentRadhika Chintamani
the knee complex complete anatomy, biomechanics, pathomechanics and its physical assessment in one single slideshow.a brief table given for easy understanding of what special test to be performed in which condition along with evidences of each special test.
small correction in slide number: 10
during flexion of tibia over femur in OKC; tibia glides and rolls posteriorly
during extension of tibia over femur in OKC: tibia glides and rolls anteriorly
The document provides a review of literature on motor control assessment. It discusses various aspects of motor control assessment including history taking, functional activity assessment, body structure and function assessment, outcome measures, and evaluation of specific areas like stability, mobility, strength, range of motion, and functional activity status. It also summarizes various studies that have evaluated methods and tools for motor control assessment like use of dynamometers, goniometers, and activity monitors.
Biofeedback machines commonly used in the physiotherapy practice are described along with available evidences for clinical use.
Most of the feedback modalities are described along with its use and the mechanism behind it.
22- Force platform- is the device used to measure the ground reaction forces in steady and/or in moving phase. Sensors in the force platform give visual feedback on the screen attached to therapist as well as patient about the weight distribution and other parameters of gait can also be measured.
33- Mirror -used as visual feedback to treat the pain as well as disability in different conditions. It healps to activate the mirror neuron in the brain. Mirrior therapy proposed by Ramchandran et al has been found most beneficial treatment in the phantom limb pain treatment
The document discusses disablement, its process, and common models used to describe it. It defines disablement and outlines Nagi, ICIDH, and ICF models of the disablement process. These models progress from pathology and impairment at the tissue/organ level to functional limitation and disability at the personal level to participation restrictions at the societal level. The document also discusses how therapeutic exercise can impact different levels of the disablement process by reducing impairments and improving function. Common physical therapy impairments, limitations, activity categories, and risk factors are also outlined.
- Centripetal force is the force required to move an object in a circular path with constant speed. It acts towards the center of the circular path.
- An object moving in a circular motion experiences centripetal acceleration even if its speed is constant, because its direction is continuously changing.
- Centripetal acceleration is the acceleration produced in circular motion by the centripetal force. It is calculated as v^2/r, where v is the object's speed and r is the radius of the circular path.
11 kinematics and kinetics in biomechanicsLisa Benson
This document outlines the key topics to be covered in the BIOE 3200 biomechanics course for Fall 2015. Students will learn to define and distinguish between kinematics, which describes motion without regard to causes, and kinetics, which analyzes the forces that cause motion using Newton's laws. The course will teach how to draw free body diagrams, apply equations of motion, and use kinematic relationships to solve biomechanics problems involving subjects extending their legs as quickly as possible.
This document outlines the physiotherapy management for obstetric brachial plexus injury. It involves initial rest, followed by gentle range of motion exercises to maintain flexibility and strength. Specific exercises target the shoulder, elbow, wrist and hand. Positioning and splinting are also used to prevent contractures while allowing the involved arm to function. Sensory re-education helps address any loss of sensation. The overall goals are to maintain range of motion, muscle suppleness and strength, prevent contractures, and maximize functional recovery of the affected arm.
Here discuss some important bio mechanical aspects of the orthosis we use use in daily physio-therapeutic rehabilitation.
We also discuss the principles under which all the orthosis works. references are various articles from pubmed. For furthur read refer Atlas of orthosis and assistive aids.
This document discusses angular kinetics and its application to human movement. It provides explanations of key concepts such as torque, moment of force, moment arm, and inertia. Examples are given to illustrate how these principles can be used to analyze human motions like sprinting starts, gymnastic skills, and strength testing positions. Key points covered include definitions of torque and inertia, factors that influence torque magnitude, and how to calculate and sum torques at joints to determine net torque and equilibrium.
This document discusses the center of gravity (COG) and its importance in human movement and sports performance. It defines the COG as the point where the entire mass of an object can be considered to be concentrated and balanced. The location of the human body's COG depends on limb positioning and can change with movement. Maintaining stability is important in many sports and depends on factors like base of support and the distance between the COG and the edge of the support. Two methods for calculating a person's COG are described: the reaction board method and the segmental method.
Gait, Phases of Gait, Kinamatics and kinetics of gaitSaurab Sharma
Intended for BPT 1st year undergraduate students.
Acknowledgement: Swathi Ganesh, my classmate during MPT prepared the slide which I modified for the purpose of teaching students.
This presentation is detail about Volta therapy which is commonly used in paediatric neurological conditions and also for adults. this presentation explains what are the various techniques, methods of application of Volta therapy, indications, contraindications, etc.
This document discusses ethics in physiotherapy. It outlines seven principles of ethics: selflessness, integrity, objectivity, accountability, openness, honesty, and leadership. It also discusses moving from an "ethics of trust" to an "ethics of rights" approach. Some ethical issues in physiotherapy are discussed like using uncalibrated equipment or treating certain patients. The four main principles of ethics - nonmaleficence, beneficence, justice, and respect for autonomy - are also outlined. The document concludes with guidelines for ethical behavior and sources for further information on physiotherapy ethics.
Biomechanics is the study of mechanics as they relate to living organisms, especially to human movement and sports activities. Biomechanists use tools like video analysis, force platforms, and wind tunnels to analyze human performance, the causes of injuries, and ways to optimize sports equipment and techniques. The goals of biomechanics are to improve sports performance, prevent injuries, design better equipment, and develop training methods to transfer skills from practice to competition.
Various types of muscle imbalance occurs in human body due to either articular, fascial or neural causes. as described by Janda this slide show elaborates on the same aspect and also differentiates two schools of thoughts on muscle imbalance, its assessment and treatment in the view of physiotherapy.
This document discusses the biomechanics of posture. It defines posture as the relative arrangement of body parts in relation to gravity. There are static and dynamic types of posture. The biomechanics of posture involves analyzing the kinetics and kinematics of all body segments. Perfect posture reduces stress on muscles and joints. However, the erect human posture is less stable than quadrupedal postures due to a smaller base of support and the location of the center of gravity being further from the base. Proper balance and control of posture depends on compensating for forces from gravity and maintaining stability of individual body segments and the whole body.
1) The sit-to-stand movement involves raising the body from a sitting to standing position and requires coordination of limbs to transfer weight while maintaining balance.
2) Individuals with knee osteoarthritis display different movement strategies during sit-to-stand, such as greater muscle co-contraction, earlier hamstring activation, and reduced hip and knee range of motion.
3) Altered movement strategies in osteoarthritis are thought to compensate for pain and weakness, helping to accomplish the task while protecting the affected knee joint.
First-year BPO - Biomechanics. here are the essential notes required to understand basic biomechanics regarding the human body and the forces acting on it.
This document discusses mechanical advantage in exercise and describes the three classes of levers. It defines key terms like moment, moment arm, force couple, and mechanical advantage. It explains that first class levers have the fulcrum between the input and output forces, second class levers have the output between the fulcrum and input, and third class levers have the input between the fulcrum and output. Most skeletal muscles act as third class levers, allowing for rapid movement with little muscle shortening. The document also covers centripetal force.
The document discusses different positions related to gravity and their effect on muscles. Against gravity positions involve moving a limb upwards perpendicular to the floor, opposing the force of gravity. Gravity eliminated positions involve moving a limb parallel to the floor, where the force of gravity is perpendicular. Gravity assisted positions involve moving downwards perpendicular to the floor, where gravity aids the movement. Simplified, movements can be parallel or perpendicular to the floor, with perpendicular movements either towards or away from the floor.
The document discusses different positions related to gravity and their effect on muscles. Against gravity positions involve moving a limb upwards perpendicular to the floor, opposing the force of gravity. Gravity eliminated positions involve moving a limb parallel to the floor, where the force of gravity is perpendicular. Gravity assisted positions involve moving downwards perpendicular to the floor, where gravity aids the movement. Simplified, movements can be parallel or perpendicular to the floor, with perpendicular movements either towards or away from the floor.
Train the trainer class presentation 2019 ( week 3 biomechanics )fitnesscentral
This document provides an overview of biomechanics and human motion terminology in 3 parts:
1. It introduces biomechanics and the subfields of kinematics and kinetics. It describes different types of motion including rotary, translatory, and curvilinear.
2. It discusses fundamental movements in the sagittal, frontal, and transverse planes. It also covers anatomical locations and terminology used to describe human motion.
3. It explains forces including motive, resistive, and isometric muscle actions. It discusses the roles of agonists, antagonists, and synergists. It concludes with the importance of stability and mobility in different parts of the body.
This document discusses muscle and skeletal physiology, including:
- The relationship between stability and mobility, and how losing harmony between the two increases injury potential.
- Classifications of muscle types (voluntary vs involuntary) and fascicle patterns (pennate vs fusiform).
- Principles of biomechanics related to levers, force, resistance, and movement mechanics.
- Concepts like ligament creep and hysteresis - how applying constant stress over time can elongate ligaments and tendons.
- The document discusses the biomechanics and pathomechanics of the elbow joint. It describes the ligaments of the elbow, the articulations between the humerus, ulna, and radius, and the range of motion of the elbow joint. It also examines the muscles that flex, extend, pronate, and supinate the forearm, discussing their attachments, actions, innervation, and the effects of joint positioning on their function. Key concepts covered include torque, moment arms, classes of levers, and the screw home mechanism of the elbow.
Year 11 biomechanics with levers, force summationryanm9
The document discusses key concepts in biomechanics including:
- Characteristics of linear, angular, and general motion.
- Centre of gravity and how it can change depending on body position.
- Line of gravity and base of support in relation to stability.
- Newton's laws of motion and how they apply to human movement.
- Force summation and how multiple body parts can work together to maximize force.
- Projectile motion principles like gravity, speed, height, and angle of release that influence how objects are thrown or projected.
Musclar force regulation fram work and joints of the bodyPravinRaj54
This document discusses muscular force regulation in the body's framework and joints. It outlines the main types of forces - tension, compression, bending, shear, unloaded, and torsion. Healthy tissues can resist changes to their structure from these forces, but injured or weakened tissues may not. The ability of connective tissues to accept and disperse loads is important for rehabilitation. Forces can be internal, produced by muscles and connective tissues, or external, from gravity or loads. Muscles apply torques to joints through their moment arms. Muscles interact with joints by applying forces that cause torques and rotation. Muscles can be activated isometrically, concentrically, or eccentrically to produce pulling forces.
The patella acts as a fixed pulley at the knee joint. By changing the angle of the quadriceps tendon pulling on the tibia, the patella increases the mechanical advantage of the quadriceps muscle, allowing it to produce greater torque and angular acceleration at the knee for the same amount of force. Other examples of bones acting as anatomical pulleys are the lateral malleolus at the ankle and the epicondyles of the femur.
Biomechanics is the study of the structure and function of biological systems through mechanics. Sports biomechanics analyzes sport movements to improve performance and prevent injuries. It applies principles of mechanics like forces, motion, momentum and balance to understand athletic performance through modeling and measurement. Some key concepts are center of gravity, friction, axes/planes of movement and running biomechanics analyzes major muscles, gait cycles and phases of stance.
This document defines equilibrium and describes the key terms and concepts related to equilibrium and levers. It provides definitions for equilibrium, force, net force, tension, weight, vector, scalar, torque, and couple. It describes the conditions for static and rotational equilibrium. It also discusses the different types of equilibrium including stable, unstable, and neutral equilibrium. The document applies these concepts to levers in the human body and describes the classes of lever systems. It concludes by defining torque and the factors that affect torque such as distance, angle, and force.
Kinesiology is the study of human movement. It involves the analysis of motion from anatomical, mechanical, and physiological perspectives. Key topics covered in the chapter include osteokinematics, which describes bone motion; arthrokinematics, which describes joint motion; and kinetics, which describes the forces that produce movement. Proper understanding of these biomechanical principles is important for analyzing and evaluating human movement.
speed, velocity, axis and pulley and its typekomalsadiya1904
a brief description of speed, velocity, axis and planes, types of pulley and its uses. this content is taken from the book the principle of exercise therapy by dena gardiner 4th edition
This document summarizes key concepts about posture including:
1. Posture can be static or dynamic, with static involving maintaining certain body positions and dynamic involving body movement.
2. Maintaining upright posture allows humans to use their arms while increasing stress on the back and reducing stability.
3. Postural control involves the central nervous system integrating inputs from vision, vestibular, proprioceptive, and musculoskeletal systems.
4. Perturbations displace the body from equilibrium, requiring compensatory responses like ankle, hip, or change of support strategies to restore stability.
This document provides an analysis of posture including definitions, types of posture, and the key body structures and forces involved in maintaining posture. It discusses static and dynamic posture and defines the concepts of center of gravity, base of support, and line of gravity. It describes the various systems that contribute to postural control and different postural responses to perturbations. Finally, it analyzes posture in the sagittal plane and the forces acting on the ankle, knee, hip, and lumbosacral joint regions.
Similar to BIOMECAHNICS PRINCIPLES OF HUMAN MOTION.pptx (20)
These lecture slides, by Dr Sidra Arshad, offer a simplified look into the types of hypoxia.
Learning objectives:
1. Define hypoxia
2. Describe the causes and features of different types of hypoxia
3. Define cyanosis
4. Enumerate the causes of cyanosis
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 35, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Central and Peripheral Cyanosis - https://www.ncbi.nlm.nih.gov/books/NBK559167/
Westgard's rules and LJ (Levey Jennings) Charts.Reenaz Shaik
Quality Control is a process used to monitor and evaluate the analytical process that produces patients results. Planning, documenting and agreeing on a set of guidelines ensures quality.
TEST BANK For Katzung's Basic and Clinical Pharmacology, 16th Edition By {Tod...rightmanforbloodline
TEST BANK For Katzung's Basic and Clinical Pharmacology, 16th Edition By {Todd W. Vanderah, 2024,} Verified Chapter
TEST BANK For Katzung's Basic and Clinical Pharmacology, 16th Edition By {Todd W. Vanderah, 2024,} Verified Chapter
TEST BANK For Katzung's Basic and Clinical Pharmacology, 16th Edition By {Todd W. Vanderah, 2024,} Verified Chapter
Ontotext’s Clinical Trials Eligibility Design Assistant helps with one of the most challenging tasks in study design: selecting the proper patient population.
Top 10 Habits for Longevity [Biohacker Summit 2024]Olli Sovijärvi
Slides from my presentation in the 10th anniversary event of the Biohacker Summit 2024 in Helsinki. The theme of the whole event wast unifying science, technology and nature.
www.biohackersummit.com
Welcome to the third issue of the second volume of NutriConnect, a bi-monthly newsletter brought to you by the Makerere University Human Nutrition Students Association. This edition focuses on the critical link between nutrition and mental health, exploring how what we eat impacts our mood, cognitive function, and overall mental well-being. Join us as we delve into the latest research, practical tips, and inspiring stories to help you nourish both your body and mind.
Hemodialysis: Chapter 8, Complications During Hemodialysis, Part 3 - Dr.GawadNephroTube - Dr.Gawad
- Video recording of this lecture in English language: https://youtu.be/pCU7Plqbo-E
- Video recording of this lecture in Arabic language: https://youtu.be/kbDs1uaeyyo
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Ventilation Perfusion Ratio, Physiological dead space and physiological shuntMedicoseAcademics
In this insightful lecture, Dr. Faiza, an esteemed Assistant Professor of Physiology, delves into the essential concept of the ventilation-perfusion ratio (V˙/Q˙), which is fundamental to understanding pulmonary physiology. Dr. Faiza brings a wealth of knowledge and experience to the table, with qualifications including MBBS, FCPS in Physiology, and multiple postgraduate degrees in public health and healthcare education.
The lecture begins by laying the groundwork with basic concepts, explaining the definitions of ventilation (V˙) and perfusion (Q˙), and highlighting the significance of the ventilation-perfusion ratio (V˙/Q˙). Dr. Faiza explains the normal value of this ratio and its critical role in ensuring efficient gas exchange in the lungs.
Next, the discussion moves to the impact of different V˙/Q˙ ratios on alveolar gas concentrations. Participants will learn how a normal, zero, or infinite V˙/Q˙ ratio affects the partial pressures of oxygen and carbon dioxide in the alveoli. Dr. Faiza provides a detailed comparison of alveolar gas concentrations in these varying scenarios, offering a clear understanding of the physiological changes that occur.
The lecture also covers the concepts of physiological shunt and dead space. Dr. Faiza defines physiological shunt and explains its causes and effects on gas exchange, distinguishing it from anatomical dead space. She also discusses physiological dead space in detail, including how it is calculated using the Bohr equation. The components and significance of the Bohr equation are thoroughly explained, and practical examples of its application are provided.
Further, the lecture examines the variations in V˙/Q˙ ratios in different regions of the lung and under different conditions, such as lying versus supine and resting versus exercise. Dr. Faiza analyzes how these variations affect pulmonary function and discusses the abnormal V˙/Q˙ ratios seen in chronic obstructive lung disease (COPD) and their clinical implications.
Finally, Dr. Faiza explores the clinical implications of abnormal V˙/Q˙ ratios. She identifies clinical conditions associated with these abnormalities, such as COPD and emphysema, and discusses the physiological and clinical consequences on respiratory function. The lecture emphasizes the importance of understanding these concepts for medical professionals and students, highlighting their relevance in diagnosing and managing respiratory conditions.
This comprehensive lecture provides valuable insights for medical students, healthcare professionals, and anyone interested in respiratory physiology. Participants will gain a deep understanding of how ventilation and perfusion work together to optimize gas exchange in the lungs and how deviations from the norm can lead to significant clinical issues.
Descoperă Bucuria Vieții Sănătoase cu Jurnalul Fericirii Life Care - Iulie 2024!
Gata să te bucuri de o vară vibrantă și plină de energie? Life Care îți vine în ajutor cu Jurnalul Fericirii din Iulie 2024, un ghid complet pentru o viață armonioasă și echilibrată.
Pe parcursul a cateva de pagini pline de informații utile și inspirație, vei descoperi:
Sfaturi practice pentru o alimentație sănătoasă:
Rețete delicioase și ușor de preparat: Bucură-te de preparate gustoase și nutritive, perfecte pentru zilele călduroase de vară.
Recomandări pentru o alimentație echilibrată: Asigură-ți aportul necesar de nutrienți esențiali pentru un organism sănătos și plin de vitalitate.
Sfaturi pentru alegeri alimentare inteligente: Învață cum să faci cumpărături sănătoase și să eviți tentațiile nesănătoase.
Trucuri pentru un stil de viață activ:
Rutine de exerciții fizice adaptate nevoilor tale: Găsește antrenamente potrivite pentru a te menține în formă și energic pe tot parcursul verii.
Idei de activități în aer liber: Descoperă modalități distractive de a te bucura de vremea frumoasă și de a petrece timp de calitate cu cei dragi.
Sfaturi pentru un somn odihnitor: Asigură-ți un somn profund și reparator pentru a te trezi revigorat și pregătit pentru o nouă zi.
Sfaturi pentru o stare de bine mentală:
Tehnici de relaxare și gestionare a stresului: Învață cum să te relaxezi și să faci față provocărilor zilnice cu mai multă ușurință.
Sfaturi pentru cultivarea optimismului și a gândirii pozitive: Descoperă cum să abordezi viața cu o perspectivă optimistă și să atragi mai multă bucurie în ea.
Recomandări pentru a te conecta cu natura: Bucură-te de beneficiile naturii asupra stării tale mentale și emoționale.
Bonus:
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2. INTRODUCTION
Mechanics is the branch of physics dealing
with the study of forces and the motion
produced by their actions.
Biomechanics involves taking the
principles and methods of mechanics and
applying them to the structure and
function of the human body
3. Kinetics is a description of motion with regard to
what causes motion.
Torque is the tendency of force to produce
rotation about an axis.
Friction is a force developed by two surfaces,
which tends to prevent motion of one surface
across another.
Kinetics deals with forces causing movement in a
system, whereas kinematics involves the time,
space, and mass aspects of a moving system
4. Kinematics can be divided into
osteokinematics and arthrokinematics.
Osteokinematics deals with the manner in
which bones move in space without regard to
the movement of joint surfaces, such as
shoulder flexion/extension.
Arthrokinematics deals with the manner in
which adjoining joint surfaces move in
relation to each other, that is, in the same
or opposite direction. Force is a push or pull
action.
5. Newton’s first law of motion:law of inertia
states that an object at rest tends to stay
at rest, and an object in motion tends to
stay in motion.
Inertia is the tendency of an object to stay
at rest or in motion.
A force is needed to overcome the inertia
of an object and cause the object to move,
stop, or change direction.
6. Newton’s 2nd law: The acceleration of the
object depends on the strength of the
force applied and the mass of the object
Acceleration is inversely proportional to
the mass of an object.
Newton’s third law of motion, the law of
action-reaction: for every action there is
an equal and opposite reaction.
The strength of the reaction is always
equal to the strength of the action, and it
occurs in the opposite direction.
7. There are basically two types of force that
will cause the body to move.
Forces can be internal, such as muscular
contraction, ligamentous restraint, or bony
support.
Forces can also be external, which could be
gravity or any externally applied resistance
such as weight, friction, and so on
Force can either be a push, which creates
compression, or pull, which creates tension.
Movement occurs if one side pushes (or
pulls) harder than the other
8. The characteristics of force include:
1. Magnitude
2. Direction
3. Point of application
Forces can be described by the effect
they produce
A linear force results when two or more
forces are acting along the same line.
9. Forces can be described by the effect they
produce. A linear force results when two or more
forces are acting along the same line.
Parallel forces occur in the same plane and in the
same or opposite direction. An example of this
would be the three-point pressures of bracing.
Two forces, in this case the X and Y, are parallel
to each other and pushing in the same direction,
while a third parallel force, the back brace, is
pushing against them.
This third force must always be located between
the two parallel forces. To be effective, it must
be of sufficient strength to counter the two
forces
10. Linear forces. (A) Two people pulling in same
direction.
(B) Two people pushing
with same force in opposite directions.
11. To produce concurrent forces, two or more forces
must act from a common point but pull in
different (divergent) directions.
The net effect of these two divergent forces is
called the resultant force, and lies somewhere in
between.
An example of resultant force in the body is the
anterior and posterior parts of the deltoid
muscle.
Both parts have a common attachment (the
insertion) but they pull in different directions.
12. A parallelogram shows
graphically the resultant
force of two divergent forces
pulling on the boat.
Resultant force of unequal
forces moves
toward the stronger force.
13. When both parallel forces are equal, the resultant
force causes the shoulder to abduct.
If the pull of the two forces were not equal, that
is, if the pull of the anterior deltoid were
stronger than that of the posterior, the resultant
force would show that the motion would be more
in the direction of the anterior deltoid
The shoulder would flex and abduct in a forward,
diagonal direction
14. A force couple occurs when two forces act in an
equal but opposite direction resulting in a turning
effect.
Torque, also known as moment of force, is the
ability of force to produce rotation about an axis.
It can be thought of as rotary force. The amount
of torque a lever has depends on the amount of
force exerted and the distance it is from the
axis.
Torque is also the amount of force needed by a
muscle contraction to cause rotary joint motion.
15. Torque about any point (axis) equals the product of
the force magnitude (how strong the force is) and
its perpendicular distance from the line of action
of the force to the axis of rotation.
The perpendicular distance is called the moment
arm or torque arm .
Therefore, the moment arm of a muscle is the
perpendicular distance between the muscle’s line
of pull and the center of the joint (axis of
rotation).
Torque is greatest when the angle of pull is at 90
degrees and decreases as the angle of pull either
decreases or increases from that perpendicular
position.
16. Effect of Moment Arm on Torque.
Moment arm and angular force are greatest at 90
degrees.
Moment arm decreases as joint moves toward 0
degrees and stabilizing force increases.
Moment arm decreases as joint moves beyond 90
degrees toward 180 degrees and dislocating force
increases.
In both cases, when the stabilizing and dislocating
forces are increasing, the angular force is decreasing.
17. Stated another way, a muscle is most efficient at
moving a joint or rotating when the joint is at 90
degrees. It becomes less efficient at moving or
rotating when the joint angle is either increasing
or decreasing
No torque is produced if the force is directed
exactly through the axis of rotation.
For example, if the biceps contracts when the
elbow is nearly or completely extended, there is
very little torque produced
18. Moment arm of biceps is the
perpendicular distance between
the muscle’s point of attachment
and the center of the joint.
Effect of moment arm on torque. (A) Moment
arm and angular force are greatest at 90 degrees. (B) Moment
arm decreases as joint moves toward 0 degrees and stabilizing force
increases. (C) Moment arm decreases as joint
moves beyond 90 degrees toward 180 degrees and dislocating force
increases. In both cases, when the stabilizing and
dislocating forces are increasing, the angular force is
decreasing
19. The perpendicular distance between the joint axis
and the line of pull is very small.
Therefore, the force generated by the muscle is
primarily a stabilizing force, in that nearly all of the
force generated by the muscle is directed back into
the joint, pulling the two bones together
Contrary to that, when the angle of pull is at 90
degrees , the perpendicular distance between the joint
axis and the line of pull is much larger. Therefore, the
force generated by the muscle is primarily an angular
force (or movement force), in that most of the force
generated by the muscle is directed at rotating the
joint and not stabilizing the joint.
20. As a muscle contracts through its range of
motion (ROM), the amount of angular or
stabilizing force changes.
As the muscle increases its angular force, it
decreases its stabilizing force and vice versa.
At 90degrees, or halfway through its range, the
muscle has its greatest angular force.
Past 90 degrees, the stabilizing force becomes a
dislocating force because the force is directed
away from the joint
21. Some muscles have a much greater stabilizing
force than angular force throughout the range,
and therefore are more effective at stabilizing
the joint than moving it
The coracobrachialis of the shoulder joint is a
good example. Its line of pull is mostly vertical
and quite close to the axis of the shoulder joint.
Therefore, it has a very short moment arm, which
makes this muscle more effective at stabilizing
than at flexing the shoulder joint
22. The angular force of the quadriceps muscle is
increased by the presence of the patella which
increases the moment arm of the quadriceps
muscle, allowing the muscle to have a greater
angular force.
Without a patella, the moment arm is smaller and
much of the force of the quadriceps is directed
back into the joint
Although this is good for stability, it is not
effective for motion. To have effective knee
motion, it is vital that the quadriceps provide a
strong angular force.
23. Moment arm of quadriceps muscle with a
patella (A) and without a patella (B)
24. STABILITY
When an object is balanced, all torques acting on
it are even, and it is in a state of equilibrium.
How secure this state of equilibrium is depends
primarily on the relationship between the object’s
center of gravity (COG) and base of support
(BOS)
COG is the balance point of an object at which
torque on all sides is equal.
It is also the point at which the planes of the
body intersect
In the human body, the COG is located in the
midline at about the level of, though slightly
anterior to S2 of an adult.
25. LEVERS
A lever is a rigid bar that can rotate about a
fixed point when a force is applied to
overcome resistance.
The fixed point about which the lever rotates
is the axis (A)/fulcrum.
In the human body, the force (F) that causes
the lever to move is usually, but not always
muscular
The resistance (R) that must be overcome for
motion to occur can include the weight of the
part being moved,gravity, or an external
weight.
26. The arrangement of the axis A in relation to
the force F and the resistance R determines
the type of lever.
27. FIRST CLASS LEVERS
In a first-class lever, the axis is located between the
force and the resistance
Best designed for balance e.g the head sitting on the
first cervical vertebra, moving up and down. The
vertebra would be the axis, the weight of one side of
the head would be the resistance, and the muscles,
pulling down on the opposite side of the head, would
be the force.
28. If you lowered your head to your
chest, your head would rotate about
the vertebra (axis).
To return to the upright position,
your posterior neck muscles (force)
must contract to pull the weight of
your head up against gravity
(resistance).
If you look up to the sky, your head
would rock back, and you would need
to use your anterior neck muscles to
pull your head back to the upright
position.
Although force and resistance may
change places, depending on the
motion, the axis is always in the
middle.
29. SECOND CLASS LEVERS
A second-class lever has
the axis at one end, the
resistance in the middle,
and the force at the other
end:
The wheelbarrow is a
second-class lever . The
wheel at the front end is
the axis, the contents of
the wheelbarrow are the
resistance, and the person
pushing the wheelbarrow is
the force.
30. The second-class lever is best
used for power e.g the action of
the ankle plantar flexor muscles
when a person stands on tiptoes.
The axis is the MP
(metatarsophalangeal) joints in the
foot, the resistance is the tibia
and the rest of the body weight
above it, and the force is provided
by the ankle plantar flexors.
The plantar flexors do not have to
move the joint very far, but they
do have a great deal of weight or
resistance to overcome.
31. THIRD CLASS LEVERS
A third-class lever has the axis at one end with
the force in the middle and resistance at the
opposite end
An example of this type of lever would be a
screendoor that has a spring attachment. The
axis is the door hinges, the force is the spring
that closes the door, and the resistance is the
door itself
The advantage of the third-class lever is ROM
(also called speed and distance). This is, by far,
the most common lever in the body.
32. • For the biceps muscle during elbow flexion .
The axis is the elbow joint, the force is that
exerted by the biceps muscle attached to
the proximal radius, and the resistance is
the weight of the forearm and hand.
• For the hand to be truly functional, it must
be able to move through a wide ROM. The
resistance will vary depending on what, if
anything, is in the hand
• There so many third-class levers, which
• favor ROM (speed and distance), and few
second class levers, which favor power, in
the body because the advantage gained
from increased ROM is more important than
the advantage gained from increased power.
33. Because the main function of the upper extremity
is to allow the hand to move through a wide range, it
is necessary that most of these muscles act as third
class levers
34. FACTORS THAT CHANGE CLASS OF LEVER
1. Change in location of Weight
Under certain conditions a muscle may change
from a second-class to a third-class lever, and
vice versa.
E.g brachioradialis is a second-class lever with
the weight of the forearm located between the
axis (elbow) and the force (distal muscle
attachment) being the main resistance.
However, with a weight in the hand, that weight
now becomes the resistance and is located
farther from the axis than the force (muscle) .
Therefore, the brachioradialis is now working as a
third-class lever.
35. 2. The direction of the movement in relation to
gravity
E.g the biceps is a third class lever because it
contracts concentrically to flex the elbow. The
muscle is the force and the forearm is the
resistance. The force is between the axis and
resistance
As the elbow extends, moving the same direction
as the pull of gravity, the biceps must contract
eccentrically to slow the pull of gravity. Gravity
and its pull on the forearm becomes the force.
The biceps becomes the resistance slowing elbow
extension
36. With the resistance now in the middle between
the force and the axis, the biceps becomes a
second-class lever.
37. MECHANICAL ADVANTAGE
This is defined as the ratio between the force
arm and the resistance arm
When the force arm (FA) is greater than the
resistance arm (RA), as with a second-class lever,
the mechanical advantage (MA) is greater than 1.
If the force arm has twice the length as the
resistance arm, it has twice the torque (rotary
force).
Whatis gained in force is lost in distance, and vice
versa. To move an object using less force (MA > 1)
will also require that the force arm move a
greater distance.
38. Conversely, by using more force (MA< 1), the force arm will
need to move a shorter distance.
If the MA = 1, the force arm and resistance arm would be
equal and the system would be balanced,as in a first-class
lever so no motion will occur..
In the application of force to a patient’s lower leg while the
patient tries to keep the knee extended, it takes less force
on your part if you place your hand distally versus
proximally
In this case the axis (A) is the knee joint, the resistance
(R) is the insertion of the quadriceps muscle, and the force
(F) is your hand on the lower leg.
Therefore, less force is needed to cause motion when the
mechanical advantage is greater.