Heat Acclimatization Developed during Summer Running in Northeastern United States

Five highly trained distance runners (DR) were observed during controlled 90-min thermoregulation trials in spring and late summer to document the extent of heat acclimatization developed during summer running in Northeastern United States. These trials simulated environmental and exercise stresses...

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Bibliographic Details
Main Authors: Armstrong,Lawrence E, Hubbard,Roger W, DeLuca,Jane P, Christensen,Elaine L
Format: Report
Language:English
Subjects:
ACCLIMATIZATION
ADAPTATION(PHYSIOLOGY)
Anatomy and Physiology
AS879
BODY TEMPERATURE
COMPARISON
DAILY OCCURRENCE
EXERCISE(PHYSIOLOGY)
EXPOSURE(GENERAL)
HEART RATE
HEAT STRESS(PHYSIOLOGY)
HEAT TOLERANCE
MEAN
OXYGEN CONSUMPTION
PE62777A
PERSPIRATION
RANGE(DISTANCE)
RATES
Runners
SKIN(ANATOMY)
STATISTICAL ANALYSIS
Stress Physiology
SUMMER
TEMPERATURE
TRAINING
UNITED STATES
WEIGHTING FUNCTIONS
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Summary:Five highly trained distance runners (DR) were observed during controlled 90-min thermoregulation trials in spring and late summer to document the extent of heat acclimatization developed during summer running in Northeastern United States. These trials simulated environmental and exercise stresses encountered by DR during daily training. Between spring and late summer, DR trained outdoors for wks but consequently showed few physiological adaptations classically associated with HA. Statistical comparison indicated no significant differences in mean heart rate, rectal temperature, sweat, plasma, or change in plasma, volume during exercise; mean weighted skin temperature was unchanged (except at 50 min of exercise) and sweat rate was also unchanged (except during the initial 30 min segments). Significant decreases in submaximal oxygen uptake were observed, at treadmill speeds of 80, 120, and 200 m min respectively. We conclude that distance runners did not require summer heat exposure to adequately thermoregulate during the spring trial, which simulated the hottest summer days recorded during this study.