Accession Number:

ADA199142

Title:

Thermoregulatory Responses of Middle-Aged and Young Men During Dry-Heat Acclimation

Descriptive Note:

Corporate Author:

ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA

Report Date:

1988-01-01

Pagination or Media Count:

7.0

Abstract:

Thermoregulatory responses during heat acclimation were compared between nine young and nine middle-aged men who were matched for body weight, surface area, surface area-to-weight ratio, percent body fat, and maximal aerobic power. After evaluation in a comfortable environment, the men were heat acclimated by treadmill walking for two 50-min exercise bouts separated by 10 min of rest for 10 consecutive days in a hot dry environment. During the first day of heat exposure performance time was 27 min longer for the middle-aged men, whereas final rectal and skin temperatures and heart rate were lower, and final total body sweat loss was higher compared with the young men. These thermoregulatory advantages for the middle-aged men persisted for the first few days of exercise-heat acclimation. After acclimation no thermoregulatory or performance time differences were observed between groups. Keywords Aging Blood responses Exercise-heat tolerance Heat acclimatization Perceptual responses Physiological responses Sweating responses Temperature regulation. Reprints.

Subject Categories:

  • Stress Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE