EXERCISE-INDUCED HYPERTHERMIA AND HORMONAL RESPONSES TO EXERCISE

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Authors
  1. Radomski, M.W.
  2. Cross, M.
  3. Buguet, A.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Changes in plasma hormonal concentrations during exericse have been ascribed to the type, duration, and intensity of exercise, physical fitness of subjects, oxygen availability and debt, and acid-base balance. However, relatively few studies have examined the possible role of exercise-induced hyperthermia. This paper reviews previous studies on this subject and describes a series of experiments carried out in our laboratories to define the role of changes in body temperature in the release of hormones during exercise. In a first series of experiments, we studied the relationship between thermoregulatory and growth hormone responses to severe exercise at 23C for 2 h in fit euhydrated subjects, controlling the core temperature increase to a maximum of 40C by varying wind speed. Exponential relationships were found between increases in core temperature and plasma growth hormone, prolactin, and catecholamines during exercise, suggesting the existence of a thermal threshold for stimulation of hormonal release during exercise. The effect of endurance exercise with and without a thermal clamp (immersion in cold and warm water) on hormonal and leukocyte responses was examined. Again, a significant expoential relationship was found between increases in core temperature and hormonal responses. TRUNCATED
Keywords
Human Growth Hormone (HGH )
Report Number
DCIEM-98-P-61 — Reprint
Date of publication
01 Aug 1997
Number of Pages
7
Reprinted from
Can J Physiol Pharmacol, vol 76, 1998, p 547-552
DSTKIM No
99-00210
CANDIS No
510030
Format(s):
Hardcopy;Document Image stored on Optical Disk

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