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Related Experiment Videos

Open loop increase in trunk temperature produced by face cooling in working humans.

M Cabanac, M Caputa

    The Journal of Physiology
    |April 1, 1979
    PubMed
    Summary

    Face fanning during exercise helps regulate core body temperature by cooling the brain, while head insulation increases body temperature. Tympanic temperature is a better indicator of core temperature than oesophageal temperature.

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    Area of Science:

    • Physiology
    • Exercise Science
    • Thermoregulation

    Background:

    • Maintaining core body temperature during exercise is crucial.
    • The brain's temperature regulation during physical activity is not fully understood.
    • Peripheral temperature measurements may not accurately reflect core temperature.

    Purpose of the Study:

    • To investigate the effects of face fanning and head insulation on human thermoregulation during exercise.
    • To determine the most accurate measure of core body temperature during exercise.
    • To explore the concept of selective brain cooling during physical exertion.

    Main Methods:

    • Five human subjects cycled on a ergometer at 10°C ambient temperature.
    • Subjects underwent periods of face fanning and head insulation in a counterbalanced order.

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  • Oesophageal temperature (Tes), tympanic temperature (Tty), skin temperatures, and heart rate (HR) were continuously monitored.

    • Main Results:

    • Face fanning decreased tympanic temperature and heart rate but increased oesophageal temperature.
    • Head covering increased tympanic temperature and heart rate, with a slight decrease in oesophageal temperature.
    • Tympanic temperature showed a strong correlation with heart rate and vasomotor responses, suggesting it's a better core temperature proxy than oesophageal temperature.

    Conclusions:

    • Face fanning may facilitate selective brain cooling during exercise by utilizing cool blood returning from the face.
    • Head insulation appears to impair heat loss, leading to a perceived hyperthermic state.
    • Tympanic temperature is a more reliable indicator of core body temperature regulation during exercise compared to oesophageal temperature.