Heat Acclimatization during Summer Running in the Northeastern United States
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1987
- Accession Number
- ADA185725
Entities
People
- Elaine L. Christensen
- Jane P. Deluca
- Lawrence E. Armstrong
- Roger W. Hubbard
Organizations
- United States Army Research Institute of Environmental Medicine