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Moderate exercise increases postexercise thresholds for vasoconstriction and shivering

G P Kenny1, A A Chen, B A Nurbakhsh

  • 1Faculty of Health Sciences, School of Human Kinetics, University of Ottawa, Ottawa, Ontario K1N 6N5. gkenny.uottawa.ca

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 7, 1998
PubMed
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Exercise significantly raises the core body temperature thresholds for vasoconstriction and shivering after physical activity. This indicates exercise has a prolonged effect on the body's cold thermoregulatory responses.

Area of Science:

  • Human physiology
  • Thermoregulation
  • Exercise science

Background:

  • Understanding cold exposure responses is crucial for public health and athletic performance.
  • Previous research has explored thermoregulatory mechanisms, but the specific impact of exercise on post-exercise cold response thresholds requires further investigation.

Purpose of the Study:

  • To determine how exercise influences the thresholds for vasoconstriction and shivering following physical exertion.
  • To quantify the changes in core body temperature required to initiate these cold defense mechanisms post-exercise.

Main Methods:

  • Six healthy subjects were exposed to controlled cooling using a water-perfused suit to establish baseline thresholds for vasoconstriction and shivering.
  • Subjects underwent either a 15-minute exercise bout (65% maximal oxygen consumption) or a seated control period.

Related Experiment Videos

  • Post-intervention, subjects were re-cooled to reassess vasoconstriction and shivering thresholds, with skin temperature effects mathematically compensated.

    • Main Results:

    • The core temperature threshold for vasoconstriction significantly increased post-exercise (36.64°C to 36.89°C).
    • The shivering threshold also significantly elevated after exercise (35.73°C to 36.13°C).
    • Control periods showed a slight decrease in thresholds over time, highlighting the exercise-induced effect.

    Conclusions:

    • Exercise leads to a sustained increase in the core body temperature thresholds for initiating vasoconstriction and shivering.
    • These findings suggest that physical activity enhances the body's ability to tolerate colder conditions by raising the temperature at which critical thermoregulatory responses are activated.