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Upright LBPP application attenuates elevated postexercise resting thresholds for cutaneous vasodilation and sweating.

Dwayne N Jackson1, Glen P Kenny

  • 1University of Ottawa, Faculty of Health Sciences, School of Human Kinetics, Human Performance and Environmental Medicine Research Laboratory, Ottawa, Ontario, Canada K1N 6N5.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 4, 2003
PubMed
Summary

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Postexercise increases in the temperature threshold for sweating and vasodilation are reversed by lower body positive pressure. This suggests venous pooling attenuates these warm thermal responses.

Area of Science:

  • Exercise Physiology
  • Thermoregulation
  • Cardiovascular Physiology

Background:

  • Postexercise increases in esophageal temperature thresholds for cutaneous vasodilation (ThVD) and sweating (ThSW) have been previously reported.
  • The underlying physiological mechanisms for these elevated thresholds remain incompletely understood.

Purpose of the Study:

  • To investigate the role of postexercise venous pooling in modulating ThVD and ThSW.
  • To determine if lower body positive pressure (LBPP) can reverse exercise-induced elevations in ThVD and ThSW.

Main Methods:

  • Six subjects underwent exercise (cycling) and no-exercise conditions, followed by exposure to LBPP or no LBPP.
  • Mean skin temperature was regulated with a liquid-conditioned suit, followed by whole-body heating to determine ThVD and ThSW.

Related Experiment Videos

  • Cutaneous vascular conductance and sweat rate were measured noninvasively.

    • Main Results:

    • Both ThVD and ThSW were significantly elevated postexercise compared to the no-exercise condition without LBPP.
    • Application of LBPP postexercise reversed the elevated ThVD and ThSW.
    • LBPP effectively counteracted the postexercise increases in both thresholds.

    Conclusions:

    • Results support the hypothesis that postexercise venous pooling contributes to attenuated warm thermal responses.
    • Baroreceptor modulation via lower body venous pooling appears to attenuate postexercise cutaneous vasodilation and sweating.
    • Lower body positive pressure can mitigate the effects of venous pooling on thermoregulatory responses.