Self-Paced Heat Acclimation Procedures,
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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The purpose of this investigation was to evaluate thh effectiveness of self-paced heat acclimation SPHA procedures. fourteen males performed 100 nmin of intermittent exercise during 9 SPHA work-rest cycles, on eight days. Exercise consisted of 8.279 P or - 0.527 to 9.799 or - 0.433 km of treadmill running per day. SPHA trials were effective in improving heat tolerance in that significant p .05 reductions were observed day 1 vs day 8 in final heart rate HR, Delta HR, final rectal temperatures Tre, Delta Tre, final mean weighted skin temperature Tsk, and Delta Tsk. Resting plasma volume expanded significantly p . 05 from day 1 to day 4, but sweat rate was unchanged. Group mean exercise intensities and ratings of perceived exertion were not statistically different from days 2 - 7, let the number of trials terminate because subjects exceeded HR and Tre safety limits 22 out of 112 trials declined during heat acclimation days 1-4 16, days 5-8 6. Symptoms of heat illness piloerection, chills, dizziness, vomiting were observed in 16.1 of all trials 11 out of 14 subjects 78.6 experienced one or more or these symptoms during SPHA trials.
- Stress Physiology