, Volume 39, Issue 6, pp 581-583

First online:

Acute heat/exercise stress in rats: Effects on fluid and electrolyte regulatory hormones

  • R. FrancesconiAffiliated withU.S. Army Research Institute of Environmental Medicine
  • , M. MagerAffiliated withU.S. Army Research Institute of Environmental Medicine

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Adult, male rats were exercised in the heat until hyperthermic exhaustion ensued. Plasma aldosterone levels were significantly (p<0.001) elevated after 8 min of exercise and remained increased throughout the exercise and recovery periods. Alternatively, plasma angiotensin I levels were unaffected during exercise, but increased significantly (p<0.001) during the recovery period. These rapid elevations in hormonal levels may be part of a sympathicoadrenal response to heat/exercise stress as well as an adaptational response to maintain plama volume during and following exercise in the heat.