Which term describes a reduction in muscle fiber elasticity due to aging?

The term that most accurately describes a reduction in muscle fiber elasticity due to aging is muscle elasticity decline. As individuals age, muscle fibers undergo changes that can result in decreased elasticity, making them less able to stretch and contract effectively. This decline can contribute to an increased risk of injuries, reduced range of motion, and overall decreases in physical performance.

Muscle hypertrophy refers to the increase in muscle size and is typically associated with strength training rather than aging. Muscle repair pertains to the process of healing and regrowth following injury or stress, which may not necessarily relate directly to aging effects on elasticity. Muscle atrophy, conversely, signifies a reduction in muscle mass, often due to disuse or aging but does not specifically address elasticity. Therefore, "muscle elasticity decline" is the most suitable term to encompass the specific loss of elasticity related to aging.