Muscles need energy to contract. While exercising the muscles need additional energy as:
- breathing rate/volume of breaths increase to bring more oxygen in to the body and remove the carbon dioxide produced.
- heart rate increases to supply muscles with extra oxygen and remove carbon dioxide produced
During long periods of vigorous activity:
- lactic acid levels build up
- gycogen reserves in the muscles become low as more glucose is used for respiration, and additional glucose is transported from the liver
The build up of lactic acid produces oxygen debt.
As the body stores of glycogen become low, the person suffers from muscle fatigue.
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