Motor unit recruitment: Is the activation of motor units based on the strength needed to perform a task. It proceeds from large to smaller motor units. It is an all-or-none phenomenon. It is not always the same for every muscle action. What does EMG measure? EMG measures the strength of muscle contraction. EMG measures the number of MU recruited. EMG measures electrical signals on the skin. EMG measures the voltage produced by muscle contraction. EMG measures both C and D. 3. In which fiber type will the contraction phase of a muscle twitch be shorter? a. Type I b. Type II
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Motor unit recruitment: The activation of motor units is based on the strength needed to perform a task. This means that as the force required for a task increases, more motor units are recruited to generate the necessary force. Show more…
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Which description is characteristic of a motor unit? a. A single motor unit's muscle fibers vary among the slow/fast aerobic and slow/fast anaerobic forms. b. When receiving an action potential, a motor unit is controlled by a single efferent axon that causes all its fibers to contract. c. When a motor unit contracts, certain sections of the muscle as a whole remain relaxed. d. If a motor unit controls walking, it is found in large numbers in the same volume of muscle. e. If a motor unit controls finger movement, it contains a large number of muscle fibers that are stimulated over a large area.
During increases in the force of skeletal muscle contraction, what is the order of recruitment of the different types of motor units?
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Which of the following do NOT result from synchronous recruitment in motor units? A. improved rate of force development B. more capability to exert steady force C. more forceful contraction D. increased protein synthesis after training
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