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Temperature dependence of the circulation pattern in the upper extremities.

E R Raman, V J Vanhuyse

    The Journal of Physiology
    |July 1, 1975
    PubMed
    Summary

    Blood flow and heat transfer in the hand were measured in young adults. As water temperature decreased, blood flow distribution shifted to deep veins, indicating a thermoregulatory response.

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    Area of Science:

    • Physiology
    • Thermoregulation

    Background:

    • Understanding hand blood flow and heat transfer is crucial for thermoregulation.
    • Previous research has explored these factors, but detailed analysis of blood flow distribution changes with temperature is ongoing.

    Purpose of the Study:

    • To quantify the rate of blood flow (D) and heat transfer (H) in the hand across a range of water temperatures.
    • To investigate how blood flow distribution changes in response to varying water temperatures.

    Main Methods:

    • Utilized a water-air displacement plethysmograph to measure both blood flow rate and heat transfer.
    • Tested eleven healthy subjects aged 18-22 years, immersing their hands in water from 10 to 40 degrees C.

    Main Results:

    • Observed a significant shift in blood flow distribution starting around 25 degrees C water temperature as it decreased.
    • This redistribution, shunting blood to deep veins, became more pronounced down to approximately 15 degrees C.
    • One subject exhibited no change in blood flow distribution pattern.

    Conclusions:

    • The hand's blood flow distribution exhibits a temperature-dependent shunting mechanism to deep veins below approximately 25 degrees C.
    • This suggests a physiological adaptation to conserve heat in cooler environments.
    • Individual variability in this thermoregulatory response exists.

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