Heat Acclimatization during Summer Running in the Northeastern United States

Five highly trained distance runners (DR) were observed during controlled 90-min thermoregulation trials in spring (T1) and late summer (T2) to document the nature of heat acclimatization in the northeastern United States. These trials simulated environmental (30.3 + or - 0.1 C dry bulb, 34.9 + or -...

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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
ADAPTIVE TRAINING
Anatomy and Physiology
BLOOD PLASMA
BLOOD VOLUME
BODY TEMPERATURE
COMPARISON
EXERCISE(PHYSIOLOGY)
HEART RATE
HEAT
HEAT STRESS(PHYSIOLOGY)
INDUCED ENVIRONMENTS
MEAN
OXYGEN CONSUMPTION
PERSPIRATION
POTASSIUM
RANGE(DISTANCE)
RECTUM
REPRINTS
RESPONSE(BIOLOGY)
RUNNING
SAFETY
SODIUM
STATISTICAL ANALYSIS
Stress Physiology
STRESSES
SUMMER
SWEAT COOLING
TEMPERATURE
TRAINING
UNITED STATES
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Summary:Five highly trained distance runners (DR) were observed during controlled 90-min thermoregulation trials in spring (T1) and late summer (T2) to document the nature of heat acclimatization in the northeastern United States. These trials simulated environmental (30.3 + or - 0.1 C dry bulb, 34.9 + or - 0. 5% relative humidity, 4.47 m.s-1 wind speed) and exercise (treadmill running at 80, 120, 160, and 200 m.min-1) stresses encountered by DR during summer training in the northeastern United States. Between T1 and T2 DR trained outdoors for 14.5 + or - 0.4 wk, but consequently exhibited few physiological adaptions classically associated with heat acclimatization. Statistical comparison fo T1 and T2 indicated no significant differences in mean heart rate, rectal temperature, sweat sodium and potassium, We conclude that DR did not require 14.5 wk of summer training to maintain safe rectal temperatures ( or = 38.4 C) during T1, which simulated the hottest days of summer in the northeastern United States. Published in Medicine and Science in Sports and Exercise, v19 n2 p131-136, 1987.