Athletes... Use up most of their glucose during respiration, Generates heat as they respire more, and sweat to cool themselves down (this sweatin results in loss of water and mineral ions)
If the body doesnt maintain the correct amount of mineral ions or the water and ion content of the body gets too low it can cause to much water to move in and out of the cells therefore damaging them.
During prolonged exercise water and ions are lost and it happens at a faster rate which can cause dehydration.
Water can rehydrate the body but cant replace the ions and glucose which were lost
Sports drinks contain water, sugar and mineral ions at levels which are most effective at maintaining performance
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