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Aging and human heat tolerance

K B Pandolf1

  • 1Environmental Physiology and Medicine Directorate, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760-5007, USA.

Experimental Aging Research
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Middle-aged adults may experience reduced heat tolerance, but this is often linked to fitness, not age itself. Healthy older individuals show comparable heat tolerance to younger people when disease is managed.

Area of Science:

  • Environmental Physiology
  • Gerontology
  • Exercise Science

Background:

  • Literature suggests middle-aged individuals exhibit greater work-heat intolerance and physiological strain during heat acclimation compared to younger adults.
  • The influence of age versus other factors like disease, physical activity, and aerobic fitness on these differences remains unclear.
  • Habitually active or aerobically trained middle-aged men demonstrate heat tolerance and physiological responses comparable to or better than younger individuals.

Purpose of the Study:

  • To review existing literature on the relationship between aging, heat tolerance, and physiological heat strain during heat acclimation.
  • To identify factors influencing age-related differences in heat tolerance, such as aerobic fitness and body composition.
  • To highlight areas requiring further research regarding heat strain in aging populations.

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Main Methods:

  • Review of experimental observations from previously published studies.
  • Analysis of data concerning aging, heat tolerance, and physiological heat strain at rest and during work.
  • Synthesis of findings related to heat acclimation and thermoregulatory responses across different age groups.

Main Results:

  • Aerobic fitness and morphological factors (body fat, weight, surface area) are crucial for maintaining heat tolerance with aging.
  • Middle-aged and older adults may be more susceptible to heat strain at significant dehydration levels, though more research is needed.
  • When chronic diseases are managed, elderly individuals exhibit heat tolerance and thermoregulatory responses comparable to younger individuals.

Conclusions:

  • Age per se may not be the primary determinant of reduced heat tolerance; rather, factors like decreased physical activity and aerobic fitness play significant roles.
  • Aerobic fitness is a key factor in maintaining heat tolerance across the lifespan.
  • Healthy, acclimated older adults can perform comparably to younger individuals in hot environments, emphasizing the importance of fitness and health status.