KNES 377 Lecture Notes - Lecture 5: Ultimate Tensile Strength, Myocyte, Motor Neuron
19 Sep 2016
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Document Summary
Motor unit: nerve, motor neuron, and muscle fiber it innervates, number of motor units depends on size and function of muscle. Small ratio of fibers to neurons: fine activities. Sarcomere: smallest contractile element of muscle fiber, actin and myosin. Type i: tonic muscles; slow twitch resistance to fatigue. Type iia and iib: phasic; fast twitch. Maximum force that a muscle or muscle group can exert. Measured by: 1 rm in healthy, 10 rm in rehab. Strength applied over a distance for a specific amount of time. Strength that is incorporated with speed and endurance. Ability of muscle to tolerate prolonged activity at a less than maximum (low) load. Neural adaptations: motor unit recruitment and rate of firing: decreases sensitivity of golgi tendon. Skeletal muscle: hypertrophy, hyperplasia, fiber type adaptation: fibers turn to type 2. Connective tissue adaptations: tensile strength of tendons and ligaments increases, increased bone-mineral content.
