Presented at the Symposium on the Thermal Effects of Exercise in the Heat at the 25th Annual Meeting of the American College of Sports Medicine, May 24-27, 1978, Washington, D.C.
HUBBARD, ROGER W. Effects of exercise in the heat on predisposition to heatstroke. Med. Sci. Sports. Vol. 11, No. 1, pp. 66-71, 1979. This article reviews briefly the historical origins for both the cardiovascular and neural-anhidrotic concepts of heatstroke pathophysiology. It describes how deemphasis of the role of anhidrosis as the primary cause of heatstroke has resulted in: (a) an increased acceptance of animal models for heatstroke research; (b) further evidence that rigid reliance on the classic heatstroke symptoms (coma, anhidrosis, and a fever over 106°F) can result in underdiagnosis; and (c) new research consistent with the hypothesis that exhaustive physical effort, by worsening circulatory collapse and metabolic acidosis predisposes tissue to hyperthermic injury and, as a result, substantially lowers the threshold for heatstroke injury and mortality. Thus, a new hypothesis combining the essential features of both direct thermal injury and cardiovascular origins of heatstroke pathophysiology may be necessary.
EXERCISE, HEATSTROKE MODEL, SERUM TRANSAMINASES
US Army Research Institute of Environmental Medicine Natick, MA 01760
Submitted for publication October, 1978.
Accepted for publication November, 1978.