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Related Experiment Videos

Selective brain cooling is affected by wearing headgear during exercise

W Rasch1, M Cabanac

  • 1Department of Physiology, Laval University, Quebec, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|March 1, 1993
PubMed
Summary

Wearing headgear during exercise impairs selective brain cooling by reducing head heat loss, leading to higher brain temperatures. This highlights the importance of head exposure for thermoregulation during physical activity.

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Area of Science:

  • Exercise Physiology
  • Human Thermoregulation
  • Environmental Physiology

Background:

  • Selective brain cooling (SBC) is crucial for managing hyperthermia during exercise.
  • Head heat loss plays a significant role in SBC.
  • The impact of headgear on SBC is not fully understood.

Purpose of the Study:

  • To investigate the relationship between head heat loss and selective brain cooling (SBC) during exercise.
  • To determine the effect of wearing headgear (cap, headband) on SBC.
  • To examine the influence of headgear on overall thermoregulation.

Main Methods:

  • Experiment I: Measured head heat loss (evaporative, radiative-convective) in four subjects exercising with no headgear, a headband, and a cap.
  • Monitored tympanic temperature (Tty) and esophageal temperature (Tes).

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  • Experiment II: Assessed peripheral vasomotor responses and hand heat loss in addition to variables from Experiment I.

    • Main Results:

    • Wearing a cap significantly reduced head heat loss compared to no headgear.
    • Tympanic temperature (Tty) was significantly lower than esophageal temperature (Tes) without headgear, indicating SBC.
    • Headgear eliminated the significant difference between Tty and Tes, suggesting impaired SBC.
    • Headgear elevated Tty and peripheral vasomotor responses while lowering Tes.

    Conclusions:

    • Headgear, particularly a cap, significantly reduces head heat loss during exercise.
    • Wearing headgear impairs selective brain cooling by hindering heat dissipation from the head.
    • Headgear use can alter thermoregulatory responses, potentially impacting exercise performance and safety in warm environments.