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Physiological and biophysical limits to work in the heat for clothed men and women.

Authors
Kamon-E; Avellini-B; Krajewski-J
Source
J Appl Physiol 1978; 44(6):918-925
NIOSHTIC No.
00185565
Abstract
The effects of increasing ambient vapor pressure and air temperature on rectal temperature, mean skin temperature, and heart rate were assessed in eight heat acclimated, lightly clothed men and women under exercise stress. The subjects were acclimatized to daily treadmill walks under conditions of 50 degrees-C dry bulb (db), 25 degrees wet bulb (wb), or 45 degrees db, and 31 degrees wb prior to experimental measurements of heart rate, oxygen consumption, mean skin temperature, rectal temperature, and sweating made during treadmill exercise at speeds ranging from 1.34 to 1.56 meters per second at ambient air temperatures of 36, 38, 40, 44, 46, 48, and 52 degrees. Each test included 1 hour of fixed ambient vapor pressure followed by a second hour of increasing vapor pressure, and treadmill speeds were adjusted to yield similar metabolic heat production for all subjects. The rectal temperature, mean skin temperature, and heart rate reached steady state levels within the first hour. No correlation was determined between the equilibrium rectal temperature and the ambient air temperature, and no significant differences were determined between rectal temperatures on the basis of gender. Increasing the ambient vapor pressure during the second hour produced subsequent increases in all three physiological responses, and significant gender differences were determined for heart rate but not for skin or rectal temperatures.
Keywords
NIOSH-Publication; NIOSH-Grant; Grants-other; Physiology; Sex-factors; Heat-exposure; Heat-acclimatization; Thermal-effects; Body-temperature; Thermoregulation
Contact
None Pennsylvania State University Noll Lab for Human Perf Res University Park, PA 16802
CODEN
JAPHEV
Publication Date
19780101
Document Type
Journal Article
Funding Amount
89094.00
Funding Type
Grant
Fiscal Year
1978
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00583
Issue of Publication
6
ISSN
8750-7587
Source Name
Journal of Applied Physiology
State
PA
Performing Organization
Pennsylvania State University Park, University Park, Pennsylvania
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