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Related Experiment Videos

Graded cutaneous vascular responses to dynamic leg exercise.

W F Taylor1, J M Johnson, W A Kosiba

  • 1Department of Physiology, University of Texas Health Science Center, San Antonio 78284.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 1, 1988
PubMed
Summary

Exercise intensity influences skin blood flow regulation. Higher workloads (above 125 W) elevate the core temperature threshold for cutaneous vascular conductance (CVC) during exercise, impacting heat dissipation.

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Area of Science:

  • Physiology
  • Exercise Science
  • Thermoregulation

Background:

  • Understanding the relationship between core body temperature and skin blood flow is crucial for regulating body temperature during exercise.
  • Previous research has explored the cutaneous vascular conductance (CVC) to esophageal temperature (Tes) relationship, but the influence of exercise intensity requires further clarification.

Purpose of the Study:

  • To investigate the role of exercise intensity in controlling skin blood flow (SkBF).
  • To determine if the CVC-Tes relationship is affected by varying workloads during exercise.

Main Methods:

  • Utilized Laser-Doppler velocimetry (LDF) for continuous SkBF measurement, unaffected by muscle blood flow.
  • Applied local skin warming to ensure consistent skin temperature and facilitate LDF observation.

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  • Measured mean arterial pressure noninvasively to calculate CVC.
  • Employed supine exercise to minimize baroreceptor-induced vasoconstriction.

    • Main Results:

    • The CVC threshold, the internal temperature at which CVC rises during exercise, was found to be graded with workload above 125 W (P < 0.05).
    • For every 25 W increase in workload beyond 125 W, the CVC threshold rose by 0.16°C.
    • In three of four subjects, the CVC threshold was not reached at the highest workload.
    • No consistent effect of workload was observed on the slope of the CVC-Tes relationship or the sweat rate threshold.

    Conclusions:

    • Exercise intensity, specifically workloads above 125 W, significantly affects the CVC-Tes relationship.
    • This effect is primarily mediated by alterations in the CVC threshold, influencing the body's ability to dissipate heat during exercise.