Body Temperature in Sedentary Adults During Moderate Exercise: No Effect from Exercise the Day Before

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Authors
  1. McLellan, T.M.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
Epidemiological findings show a continued presence of exertional heat injury during military basic recruit training. Current guidelines do not consider the carry-over effects of prior exercise of exposure to high ambient temperatures on the risk of succumbing to heat illness. From the epidemiological evidence we hypothesized that both prior exercise and exposure to hot environments on the day before would increase the core temperature response during exercise the next day. Seven sedentary and non heat-acclimated men and women each performed eight randomized exposures involving treadmill walking for a maximum of 2 h every 2 wk. Two separate control trials at a wet bulb globe temperature (WBGT) of 22.5C and 26.5C consisted of exercise during the morning only. Six experimental trials involved successive days of exercise with trials on the second day at either a WBGT of 22.5C or 26.5C. All of the expimental trials involved walking during the first morning at a WBGT of 22.5C. Further, four of these trials included additional exercise in the afternoon at either a WBGT of 22.5C (two trials) or 29.5C (two trials). There was no impact of prior exercise on the day preceding the tests at either WBGT for any of the dependent measures. Rectal temperatures increased to 38.0C at the WBGT of 22.5C and to 38.5C for trials at 26.5C. TRUNCATED
Keywords
Human performance
Report Number
DRDC-TORONTO-SL-2001-146 — Scientific Literature
Date of publication
01 Jun 2002
Number of Pages
12
Reprinted from
Aviation, Space, and Environmental Medicine, vol 73, no 12, 2002, p 1167-1175
DSTKIM No
CA021760
CANDIS No
518484
Format(s):
Hardcopy;Document Image stored on Optical Disk

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