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Related Experiment Videos

Stress hyperthermia: physiological arguments that it is a fever.

E Briese1, M Cabanac

  • 1Department of Physiology, Faculty of Medicine, Laval University, Québec, Canada.

Physiology & Behavior
|June 1, 1991
PubMed
Summary

Stress-induced rise in rat body temperature is a regulated fever, not hyperthermia. This emotional fever involves a set-point shift, confirmed by skin temperature and environmental studies.

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Area of Science:

  • Physiology
  • Neuroscience
  • Behavioral Science

Background:

  • Stress and emotional states can alter body temperature.
  • The precise thermoregulatory mechanisms underlying stress-induced temperature changes are not fully understood.
  • Distinguishing between fever and hyperthermia is crucial for understanding physiological responses.

Purpose of the Study:

  • To test the hypothesis that stress-induced rise in central temperature (Tc) in rats is a regulated fever with an upward set-point shift.
  • To investigate the role of skin vasomotor responses in emotional thermoregulation.
  • To differentiate emotional fever from prostaglandin-induced fever.

Main Methods:

  • Measuring tail skin temperature and central temperature (Tc) during stress.

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  • Assessing the impact of ambient temperature on stress-induced Tc changes.
  • Comparing emotional Tc rise during day and night cycles.

    • Main Results:

    • Skin vasomotor responses supported Tc increase and regulation at a higher level.
    • Cold ambient temperatures did not reduce the emotional Tc rise, unlike in hyperthermia.
    • Emotional fever was higher at night than during the day, suggesting distinct mechanisms from prostaglandin-induced fever.

    Conclusions:

    • The rise in Tc induced by handling or disturbance in rats is a regulated response.
    • This stress-induced temperature increase is caused by a set-point shift, analogous to fever.
    • Emotional fever appears to be a distinct physiological process from prostaglandin-mediated fever.