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Elevated body temperature in female rats after exercise.

E Satinoff1, S Kent, M Hurd

  • 1Department of Psychology, University of Illinois, Champaign 61820.

Medicine and Science in Sports and Exercise
|November 1, 1991
PubMed
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Regular nighttime exercise in rats elevates body temperature (Tb) during both active (dark) and resting (light) periods. This suggests exercise resets the thermoregulatory set-point, impacting daily Tb fluctuations.

Area of Science:

  • Physiology
  • Animal Behavior
  • Thermoregulation

Background:

  • Sedentary Sprague-Dawley rats exhibit diurnal body temperature (Tb) variations, peaking in the dark phase and troughing in the light phase.
  • Normal Tb ranges from 36.0°C (light) to 38.1°C (dark).

Purpose of the Study:

  • To investigate the effect of voluntary exercise on body temperature regulation in rats.
  • To determine if sustained exercise can alter the thermoregulatory set-point.

Main Methods:

  • Telemetry was used to measure body temperature (Tb) in Sprague-Dawley rats under different housing conditions.
  • Rats were housed in standard cages (sedentary) or cages with activity wheels (exercising).
  • Experimental groups experienced cycles of wheel-open (WO) and wheel-locked (WL) conditions to isolate exercise effects.

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Main Results:

  • Rats housed in activity wheels showed increased mean peak Tb (39.5°C) during the dark phase and elevated mean trough Tb (36.5°C) during the light phase.
  • During wheel-locked periods, Tb levels returned to sedentary control values, indicating exercise-dependence.
  • Repeated cycles of wheel access and locking demonstrated rapid Tb adjustments, supporting a direct link between exercise and Tb regulation.

Conclusions:

  • Steady, voluntary exercise, particularly during the active (dark) phase, leads to an upward resetting of the thermoregulatory set-point.
  • This exercise-induced set-point shift influences body temperature during both activity and rest periods.
  • The findings support the hypothesis that sustained physical activity can modify central thermoregulatory control mechanisms.