Heat acclimation and hydration also can help to mitigate heat's effects on the older heart. Most heat illnesses occur during the first couple of exercise sessions in the heat. Pay attention to your fluid intake when exercising in hot weather. If you think it may be too hot to exercise at a certain time of day, it probably is. Learn the signs and symptoms of heat related illness and emergency treatments.
Prescription medication can affect thermoregulation in hot environments.
Ask your physician about these effects.