Gastric Emptying during Exercise: Effects of Heat Stress and Hypohydration
Abstract
To determine the effects of acute heat stress, heat acclimation and hypohydration on the gastric emptying rate of water (W) during treadmill exercise, ten physically fit met ingested 400 ml of W before each of three 15 min bouts of exercise on five separate occasions. Stomach contents were aspirated after each exercise bout. Before heat acclimation (ACC), experiments were performed in a neutral (18 C), hot (49 C) and warm (35 C) environment. Subjects were euhydrated for all experiments before ACC. The following new observations were made: (1) exercise in a hot (49 C) environment impairs gastric emptying rate as compared with a neutral (18 C) environment, (2) exercise in a warm (35 C) environment does not significantly reduce gastric emptying before or after heat acclimation, but (3) exercise in a warm environment (35 C) when hypohydrated reduces gastric emptying rate and stomach secretions. Reductions in gastric emptying appear to be related to the severity of the thermal strain induced by an exercise/heat stress. Keywords: Thermal strain; Heat acclimation; Treadmill exercise; Fluid replacement; Stomach secretions; Reprints. (kt)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1989
- Accession Number
- ADA215508
Entities
People
- Aaron J. Young
- Michael N. Sawka
- P. D. Neufer
Organizations
- United States Army Research Institute of Environmental Medicine