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Relationship between physique and rectal temperature cooling rate.

M D White1, W D Ross, I B Mekjavić

  • 1School of Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada.

Undersea Biomedical Research
|March 1, 1992
PubMed
Summary
This summary is machine-generated.

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Body mass, not fat or muscle, significantly correlates with core body temperature cooling rate in the thermoneutral zone. Gender influences this relationship, likely due to differing fat distribution.

Area of Science:

  • Human Physiology
  • Thermoregulation
  • Anthropometry

Background:

  • Previous studies show inconsistent relationships between physique and core body temperature cooling rates.
  • Inconsistencies may stem from unaddressed thermoregulatory responses and incomplete physique assessments.
  • This study focuses on the 'null zone' of core temperature (Tre) to minimize shivering and sweating effects.

Purpose of the Study:

  • To investigate the relationship between various physique components and core body temperature cooling rate.
  • To examine this relationship within the thermoneutral 'null zone' where active thermoregulatory effectors are absent.

Main Methods:

  • Twenty healthy subjects (10 male, 10 female) with diverse physiques underwent anthropometric measurements.
  • Measurements included height, body mass, skinfolds, girths, and breadths to estimate body composition.

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  • Subjects were heated and then cooled in controlled water baths, with continuous monitoring of Tre, skin temperature, and heat flux.

    • Main Results:

    • Adipose and skeletal muscle tissue masses did not correlate with Tre cooling rate in the null zone.
    • Total body mass showed a significant correlation (r=0.5, P≤0.05) with Tre cooling rate.
    • Gender appeared to influence the body mass-Tre cooling relationship, possibly due to adipose tissue distribution differences.

    Conclusions:

    • Total body mass is a significant factor influencing core body temperature cooling rate in the absence of active thermoregulation.
    • Specific tissue masses (adipose, muscle) are not directly correlated with cooling rate in this temperature range.
    • Gender-based differences in fat distribution may modulate the relationship between body mass and thermoregulation.