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Related Experiment Videos

Effect of local warming on forearm reactive hyperaemia.

J M Johnson, D S O'Leary, W F Taylor

    Clinical Physiology (Oxford, England)
    |August 1, 1986
    PubMed
    Summary

    Standard forearm ischemia protocols may underestimate maximal forearm blood flow. Local warming significantly enhances blood flow, indicating incomplete vasodilation with ischemia alone. This impacts accurate measurement of minimal vascular resistance.

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    Area of Science:

    • Cardiovascular Physiology
    • Human Circulation
    • Vascular Biology

    Background:

    • Minimal vascular resistance measurement aids in quantifying regional circulation changes.
    • Accurate assessment necessitates complete relaxation of regional resistance vessels.
    • Current human protocols use forearm ischemia to achieve maximal forearm blood flow.

    Purpose of the Study:

    • To determine if forearm skin is fully vasodilated using standard ischemia procedures.
    • To investigate the effect of local warming on forearm blood flow during reactive hyperemia.

    Main Methods:

    • Plethysmography measured peak forearm blood flow in six healthy subjects.
    • Measurements were taken at neutral arm temperature (33°C) and local warming (42°C) after 10 minutes of ischemia.

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  • Laser Doppler velocimetry confirmed findings in four additional subjects, assessing skin blood flow.

    • Main Results:

    • Local warming significantly elevated peak reactive hyperemia blood flow (79.6 ml/100ml/min) compared to normothermia (50.2 ml/100ml/min).
    • Laser Doppler velocimetry showed a significant increase in skin blood flow with warming (1.26 V vs. 0.89 V).
    • Ischemia plus local warming did not further increase skin blood flow beyond warming alone.

    Conclusions:

    • Ten minutes of ischemia at normothermia is insufficient for full cutaneous resistance vessel relaxation.
    • Standard protocols may underestimate maximal forearm blood flow due to incomplete vasodilation.
    • Local warming is crucial for achieving maximal forearm blood flow and accurate minimal vascular resistance assessment.