Influence of Polycythemia on Blood Volume and Thermoregulation during Exercise-Heat Stress
Abstract
We studied the effects of autologous erythrocyte infusion on blood volume and thermoregulation during exercise in the heat. Nine unacclimated male subjects were infused with either 600 ml of a sodium chloride-glucose-phosphate solution containing a approx 50% hematocrit or 600 ml of this solution only. A heat stress test (HST was attempted approx 2-wk pre- nd 48-h postinfusion during the late spring months. The following observations were made: the increased Erythrocyte volume was associated with a reduction in plasma volume to maintain the same blood volume as during the preinfusion measurements: polycythemia reduced total circulating protein but did not alter F-cell ratio, plasma osmolality, plasma protein content, or plasma lactate at rest or during exercise-heat stress; polycythemia did not change the volume of fluid entering the intravascular space from rest to exercise-heat stress; and polycythemia tended to reduce the rate of heat storage during exercise-heat stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1987
- Accession Number
- ADA185734
Entities
People
- Andrew J Young
- Michael N. Sawka
- Richard C. Dennis
- Richard R. Gonzalez
- Stephen R. Muza
Organizations
- United States Army Research Institute of Environmental Medicine