Factors affect net body fluid retention in milk and its application to prevent heat illness.

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To prevent re-dehydration after exercise, we investigated the body fluid retention of various experimental drinks. We found strong activities in milk and soymilk on body fluid retention. These activities were caused by crude proteins in milk and soymilk not by a specific protein. Milk protein solution, which were prepared by removing electrolytes by dialysis, elevated plasma aldosterone level and maintained plasma sodium level and osmolality. Furthermore, carbohydrate protein solution were superior for glycogen recovery and fluid retention because addition of carbohydrate to protein solution did not decrease body fluid retention.