Registered Kinesiologist Practice Test 2025 – Your All-in-One Guide to Exam Success!

Muscle hypertrophy specifically refers to the increase in muscle size that occurs as a result of strength training or resistance exercise. This physiological process involves an increase in the cross-sectional area of muscle fibers, primarily stimulated by mechanical overload during exercise. When muscles are subjected to stress from lifting weights or other resistance activities, they adapt and grow in size to better handle that stress. Such changes can lead to improved performance, strength, and endurance in physical activities.

In contrast, a decrease in muscle size would indicate muscle atrophy rather than hypertrophy. Improvement of flexibility relates to the ability of joints to move through their full range of motion but does not directly involve muscle size increases. Reduction of muscle fatigue pertains to endurance and recovery rather than the physiological growth of muscle tissue. Hence, the correct answer aptly captures the fundamental definition of muscle hypertrophy in the context of kinesiology.