Question from chapter tissues

Due to excessive workout, an athlete was suffering from fatigue. He was advised to take rest for some time and rejoin a. Why did he feel tired after the exercise? b. Why was he asked to take rest and then join the practice again?

A) The glucose undergoes metabolism in the presence of oxygen to form ATP(adenosine triphosphate) which is essential for muscle contraction. But during vigorous exercise, the body cannot meet the oxygen demand and the glucose undergoes metabolism in the absence of oxygen which results in the formation and accumulation of lactic acid. Feeling of fatigue after running fast for some time is due to the accumulation of lactic acid in muscles.

B)Taking rest will allow the body to replenish energy, stores and repair damaged tissues. Without sufficient time to repair and replenish, the body will continue to break down from intensive exercise.
Hope it helps :slightly_smiling_face: