EXCRETION TRENDS IN MEN UNDERGOING DEACCLIMATIZATION TO HEAT

EXCRETION TRENDS IN MEN UNDERGOING DEACCLIMATIZATION TO HEAT

The possibility that exercise or good physical condition influences the rate at which human beings deacclimatize to heat was investigated. Twenty-one men were studied over a 10-week period during which daily peak temperatures declined from 95 to 54 F. (September to November). Two overnight (timed) u...

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Bibliographische Detailangaben
Hauptverfasser: HALE,HENRY B, ELLIS,JAMES P JR
Format: Report
Sprache:eng
Schlagworte:
BIOCLIMATOLOGY
CLIMATE
EXCRETION
EXERCISE(PHYSIOLOGY)
EXPERIMENTAL DATA
EXPOSURE(PHYSIOLOGY)
HEAT
HUMANS
METABOLISM
STATISTICAL ANALYSIS
TEMPERATURE
UREA
URIC ACID
URINE
VOLUME
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Zusammenfassung:The possibility that exercise or good physical condition influences the rate at which human beings deacclimatize to heat was investigated. Twenty-one men were studied over a 10-week period during which daily peak temperatures declined from 95 to 54 F. (September to November). Two overnight (timed) urine specimens per subject per week were analyzed for Na, K, PO4, urea, uric acid, creatinine, and 17-hydroxycorticosteroids (17-OHCS). Five of the men exercised daily, 9 exercised twice each week, and 7 never exercised (exercise was defined as cross-country runs of 3 to 8 miles). Urine volume, uric acid excretion rate, the uric acid/creatinine ratio, urea excretion rate, and sodium excretion rate tended to remain at the initial (summer) level; these observations suggest that summertime adjustments are quite persistent. However, significant variation with time was found for creatinine, potassium, and 17-hydroxycorticosteriod excretion rate as well as for the urea/creatinine, phosphate/creatinine, sodium/potassium, and 17-OHCS/creatinine ratios. (Author)