Which statement best describes how recovery time influences fatigue during repeated exercise?

• A. Allows muscle glycogen stores to be restored
• B. Increases lactate production during exercise
• C. Reduces fatigue by restoring energy and repairing tissue
• D. Reduces hydration needs

Answer: (C)

Recovery time matters because fatigue during repeated exercise comes from both depleted energy supplies and accumulated micro-damage in muscles. When you rest, your energy systems rebound: phosphocreatine stores are rebuilt so quick ATP resynthesis can occur again, and glycogen stores are replenished to fuel subsequent work. Rest also allows tissue repair and the clearing of by-products like lactate and hydrogen ions, which can interfere with muscle contraction. Put together, these processes reduce how fatigued you feel in the next bout and improve performance. Restoring glycogen is part of this, but the statement that focuses on restoring energy and repairing tissue captures the overall way recovery lowers fatigue. Increasing lactate production would make fatigue worse, and hydration needs aren’t a direct mechanism by which recovery time reduces fatigue.