Within 1 week of beginning resistance exercise of the shoulder external rotators as a component of a rehabilitation program after a shoulder injury, your patient, Mr.K, is able to increase the level of resistance by using a heavier grade of elastic tubing.This improvement in muscle performance is due primarily to which of the following adaptive changes?
A)Increased recruitment of motor units
B)Increased oxygen to the muscle
C)Hypertrophy of muscle fibers
D)Fiber-type transformation from slow twitch to fast twitch

Question

Quizplus · Accepted Answer

The ability to increase resistance within a short period of time suggests that the improvement in muscle performance is due to increased recruitment of motor units, rather than hypertrophy of muscle fibers, fiber-type transformation, or increased oxygen supply to the muscle. The central nervous system becomes more efficient at activating motor units in response to resistance training, leading to increased strength and power.

Within 1 Week of Beginning Resistance Exercise of the Shoulder