Whether you need to replace electrolytes or not during exercise is an area well researched, but still somewhat of a debate. During exercise, stores of sodium, potassium and chloride barely alter, because as more fluid is lost than electrolytes, the concentration of electrolytes in plasma increases or remains constant. As part of the heat acclimatisation process, the body adapts to the stress of repeated episodes of dehydration by producing more abundant, yet dilute sweat.
However, a higher concentration of electrolytes in the digestive system can help to promote fluid absorption, thereby reducing the risk of dehydration.
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