Exercise in the heat results in major alterations in circulatory, ther
moregulatory and metabolic function. Hyperthermia appears to be the cr
itical determinant of exercise performance in the heat. Thus, strategi
es that minimise the rise in core temperature during exercise in the h
eat are likely to contribute to enhanced performance. These include ac
climatisation to heat, adequate hydration prior to exercise and ingest
ion of fluids during exercise, and pre-exercise cooling.