Water and mineral balance during exercise
1991
Costill, D.L.
The ability to lose body heat during exercise depends, for the most part, on the formation and evaporation of sweat. The amount of sweat lost during exercise, in turn, is dictated by exercise intensity, body size, and environmental heat stress. Exercising in warm weather may evoke sweat losses in excess of two quarts per hour (Nielsen 1938; Costill et al 1980). Despite efforts to drink fluids during an event such as the marathon, sweating and the loss of water in the air we breath may reduce body water content by 13 to 14 percent.
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