Certified Personal Trainer (NSCA) Practice Exam

What is most likely to happen during a set of 10 repetitions at 75% of the 1RM for the squat exercise?

1. Motor unit recruitment increases

2. Rate coding increases

3. Muscle pH increases

4. ATP stores increase

The correct answer is: Motor unit recruitment increases

During a set of 10 repetitions at 75% of the one-repetition maximum (1RM) for the squat exercise, motor unit recruitment is indeed most likely to increase. At this intensity and volume, the body requires the activation of a larger number of motor units to generate the necessary force to complete the repetitions. As one approaches higher intensities, especially in resistance training, the central nervous system recruits more motor units to overcome the load, which in turn stimulates more muscle fibers, leading to greater overall muscle activation. This increase in motor unit recruitment is crucial for improving strength and muscular endurance, making it essential for personal trainers to understand how the body adapts to resistance training. By training at this intensity, individuals can effectively enhance their neuromuscular coordination and muscle performance.