Angle-or,,,,,-Pull-of-Muscleexercise therapy.pptx
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angle of pull of muscle with example of upper extrimity
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TYPES OF MUSCLE CONTRACTION
There are four types of muscle contraction: isotonic, concentric, eccentric, and isometric. Isotonic contraction occurs when tension remains constant but length changes. Concentric contraction is when the muscle shortens to produce movement in the direction of pull. Eccentric contraction is when the muscle lengthens while opposing a greater external force, causing movement opposite the direction of pull. Isometric contraction happens when muscle length remains constant, resulting in no movement.
Body Mechanics and Physiology in Function
The document discusses principles of body mechanics and muscle physiology related to function. It covers topics like stability, equilibrium, effort distribution, muscle fiber types, motor unit recruitment, and roles of different muscles. Some key points are:
- The wider the base of support and lower the center of gravity, the greater the stability. Equilibrium is maintained as long as gravity passes through the base.
- Using larger muscle groups and keeping the center of gravity close to the work load prevents strain. Different muscle fiber types (slow oxidative, fast oxidative, fast glycolytic) support different functions.
- A motor unit is all the fibers innervated by a motor neuron. Maximum strength occurs when all motor units fire together
chapter 03 week 2 lecture 2
This lecture discusses the structure and function of skeletal muscle. It describes the different types of muscle contractions - concentric, eccentric, and isometric. It explains the sliding filament theory of muscle contraction and how cross-sectional area, shape, and line of pull determine a muscle's functional potential. It also describes how the length of a muscle affects its force production and discusses principles of stretching and strengthening muscle.
Acute knee injury
An acute knee injury commonly seen in adolescent female football players is an anterior cruciate ligament (ACL) tear, which often occurs due to hyperflexion and internal rotation of the knee. A Lachman test is used to diagnose an ACL injury by attempting to displace the tibia forward while stabilizing the femur. A prevention program including a 15-minute neuromuscular warm-up performed twice weekly was shown to reduce the rate of ACL injuries by 64% in the study. Knee injuries are generally treated initially with RICE (rest, ice, compression, elevation) and physical therapy, with surgery such as ACL reconstruction or knee arthroscopy sometimes required.
strength PDHPE
There are three main types of resistance training: isometric, isotonic, and isokinetic. Isometric training involves contracting muscles without movement through static positions. Isotonic training uses weights and allows muscle movement through a range of motion with constant resistance. Isokinetic training uses machines to provide resistance equal to the force exerted through a full range of motion at a controlled speed. Each method has advantages like targeting specific muscles or joints and disadvantages such as limited range of motion or expensive equipment requirements.
Knee biomechanics dr.bhuvanesh
This document discusses knee biomechanics and provides definitions of key concepts. It summarizes the biomechanics of the knee joint, including range of motion, meniscus function, ligament function, and alignment. Key points are that the knee is a hinge joint with rolling and sliding motion. The menisci absorb shock, distribute load, and aid lubrication. The ACL and PCL prevent unwanted translation of the tibia. Proper lower extremity alignment and the Q-angle are important for knee function.
Peripheral joint mobilization
The document discusses peripheral joint mobilization and manipulation techniques. It defines these techniques as passive manual therapy applied to joints to address range of motion limitations from altered joint mechanics. The techniques can be non-thrust oscillations or sustained distraction, or high-velocity thrusts applied at the end of available motion. Proper positioning, stabilization, and application of specific sliding forces are described to safely stretch tight joint capsules while avoiding compression. The effects of increased motion on joint health are also summarized.
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Angle-or,,,,,-Pull-of-Muscleexercise therapy.pptx
- 1. ANGLE OF PULL OF MUSCLE Dr. kavita Meena Department of Physiotherapy
- 2. Skeletal muscles are attached to bones on each end by tendons. The origin: is the fixed attachment The insertion: moves with contraction.
- 3. DEFINITION Angle between muscle insertion and bone on which it inserts. Rotary component Nonrotary component
- 4. INTRODUCTION A force is most effective when it is applied at right angle. Muscle’s angle of pull changes with every degree of joint motion.
- 5. MECHANICAL EFFICIENCY OF A MUSCLE Mechanically the pull is most efficient when the muscle is inserted at right angles to the bone. Rotary Component: Force of a muscle contributing to bone's movement around a joint axis.
- 6. ANGLE OF PULL IS REDUCED… <90° This efficiency is decreased as the angle of pull is reduced, because some of the force is used in pulling the bone of insertion towards the joint representing the fulcrum.
- 7. Most resting muscles have an angle of pull < 90°. Helps to maintain stability of the joint. Closer the angle of pull is to 90° greater the Rotary component.
- 8. ANGLE OF PULL….. 90° The approximation of the articular surfaces has a stabilizing effect upon the joint which is greatest when the direction of the pull of muscle is longitudinal.
- 9. ANGLE OF PULL IS INCREASED… >90° The mechanical efficiency of the muscle pull is also reduced when the angle of insertion is increased from the right angle.
- 10. ANGLE OF PULL IS INCREASED… >90° (CONTI…) In this case the joint becomes less stable as the angle increases. Can not exert much force.
- 12. EFFICIENCY OF A RESISTANCE The sustained pull of a force offering resistance will also be maximal when it is applied at right angle to a lever. It will decrease as the angle of pull becomes acute / obtuse.
- 13. Resistance can be applied with the help of rope / therapist hand. Right angle pull is employed in that part of the ange in which maximum resistance is required.