Acute heat/exercise stress in rats: effects on fluid and electrolyte regulatory hormones.
Adult, male rats were exercised in the heat until hyperthermic exhaustion ensued. Plasma aldosterone levels were significantly (p less than 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 less than 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 plasma volume during and following exercise in the heat.
D000450:Aldosterone / Q000097:blood*; D000803:Angiotensin I / Q000097:blood*; D000809:Angiotensins / Q000097:blood*; D000818:Animals; D006358:Hot Temperature; D007700:Kinetics; D008297:Male; D005082:Physical Exertion; D051381:Rats; D013312:Stress, Physiological / Q000097:blood; D014882:Water-Electrolyte Balance
D000809:Angiotensins; D000450:Aldosterone; D000803:Angiotensin I