What term describes the shrinking of muscle fibers in size?

The term that describes the shrinking of muscle fibers in size is atrophy. Atrophy occurs when there is a decrease in the size or mass of muscle fibers due to factors such as inactivity, malnutrition, or injury. This process leads to a decline in muscle strength and can occur in many muscles across the body when they are not regularly engaged in physical activity or when there is a significant lack of stimulation.

This concept is important, especially in contexts such as rehabilitation and exercise, as understanding atrophy can help individuals recognize the need for regular movement and strength training to maintain muscle health and performance.