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Cutaneous active vasodilation in humans during passive heating postexercise.

Glen P Kenny1, Julien Periard, W Shane Journeay

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

Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 5, 2003
PubMed
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Exercise increases the body

Area of Science:

  • Exercise physiology
  • Thermoregulation
  • Cutaneous vascular control

Background:

  • The body's ability to regulate temperature during exercise is crucial.
  • Cutaneous vasodilation is a key mechanism for heat dissipation.
  • The role of active vasodilation versus adrenergic vasoconstriction in exercise-induced thermoregulation is not fully understood.

Purpose of the Study:

  • To test the hypothesis that exercise increases the esophageal temperature threshold for cutaneous vasodilation onset.
  • To investigate whether this increase is mediated by altered active vasodilator activity.
  • To differentiate the roles of active vasodilation and adrenergic vasoconstriction in postexercise thermoregulation.

Main Methods:

  • Nine subjects underwent treadmill exercise at varying intensities (55%, 70%, 85% peak oxygen consumption) or rest.

Related Experiment Videos

  • Mean skin temperature was increased using a suit, and local forearm temperature was clamped.
  • Cutaneous vascular conductance was measured at alpha-adrenergic intact and blocked forearm sites.

    • Main Results:

    • Exercise significantly increased the postexercise esophageal temperature threshold for cutaneous vasodilation onset.
    • No difference in this threshold was observed between alpha-adrenergic intact and blocked forearm sites.
    • The magnitude of the threshold increase was intensity-dependent.

    Conclusions:

    • Exercise elevates the temperature threshold for initiating skin blood flow to dissipate heat.
    • This elevation is likely mediated by changes in active vasodilator control, not adrenergic vasoconstriction.
    • Findings suggest a central neural adaptation in thermoregulatory control following exercise.