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Intersegmental differences in facial warmth sensitivity during rest, passive heat and exercise.

Jung-Hyun Kim1,2, Yongsuk Seo2, Tyler Quinn2

  • 1a Department of Sports Medicine , Kyung Hee University , Yongin-si , South Korea.

International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group
|July 18, 2019
PubMed
Summary

Facial warmth sensitivity varies by region, with the upper lip being most sensitive. Facial temperature, not core temperature, significantly impacts thermal comfort perceptions during varying environmental conditions.

Keywords:
Facial temperaturesheat fluxheat-producing activitiesthermal comfortthermal sensations

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Area of Science:

  • Human physiology
  • Environmental science
  • Thermal comfort research

Background:

  • Facial warmth perception can influence overall thermal discomfort.
  • Different facial regions exhibit distinct temperature profiles.
  • Understanding regional facial warmth sensitivity is crucial for thermal comfort studies.

Purpose of the Study:

  • To investigate differences in facial warmth sensitivity across various facial regions.
  • To analyze these differences under thermoneutral, warm, and exercise conditions.
  • To determine the relationship between facial temperature and perceived thermal comfort.

Main Methods:

  • Heat flux measurements were taken on six facial regions of twelve men.
  • Participants underwent rest in thermoneutral (25°C) and warm (40°C) conditions.
  • Exercise (400 W metabolic heat production) was performed in a 40°C, 30% RH environment.

Main Results:

  • Forehead showed the highest temperatures; nose and chin showed the lowest depending on conditions.
  • Warmth sensitivity varied significantly across facial regions, with the upper lip being most sensitive.
  • Perceived thermal comfort was more strongly correlated with mean facial temperature (Tface) than core temperature (Tco) or overall body thermal sensation.

Conclusions:

  • Regional differences in facial warmth sensitivity exist and influence thermal perception.
  • Facial temperatures tend towards equilibration during heat-producing activities.
  • Facial temperature is a more significant predictor of thermal comfort than core temperature or overall body thermal sensation.