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Scheduling cycles of work for hot ambient conditions.

Authors
Kamon-E
Source
Ergonomics 1979 Apr; 22(4):427-439
NIOSHTIC No.
00092156
Abstract
Six male college students were monitored for changes in rectal (Tre) and mean skin (T) temperatures, heart rate (HR), and sweat production and evaporation to determine optimal work and rest periods based on muscular work and heat stress. Exercise cardiograms were recorded and maximal oxygen uptake was measured during a progressive treadmill stress test under warm and humid and dry and hot ambient conditions. Resting responses were tested under the same conditions as work, and under neutral ambient conditions. HR and Tre responses were similar for consecutive work and rest cycles under neutral conditions, and continuously increased from cycle to cycle when work and rest were under the same warm and humid condition. Both responses were reduced with rest at neutral ambience. Responses were less strained in hot and dry ambience in general and reduced further with rest in the neutral condition. When the metabolic demand of work was close to the maximal aerobic capacity, the allowable work period was shorter and the rest requirement was longer. The author concludes that the design of cyclic work can be based on the cumulative circulatory strain of the work load and heat stresses, and HR can be used as a strain indicator. Resting periods must be scheduled for cooler neutral ambient conditions when work is performed under humid ambient conditions.
Keywords
NIOSH-Publication; NIOSH-Grant; Grants-other; Research-laboratories; Scientific-personnel; Work-time-standards; Work-scheduling; Work-planning; Work-intervals; Heat-exposure; Working-load; Stress-relaxation-tests; Rest-periods; Humans
Contact
None Pennsylvania State University Noll Lab for Human Perf Res University Park, PA 16802
CODEN
ERGOAX
Publication Date
19790401
Document Type
Journal Article
Funding Amount
89094.00
Funding Type
Grant
Fiscal Year
1979
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00583
Issue of Publication
4
ISSN
0014-0139
Priority Area
Other Occupational Concerns; Grants-other
Source Name
Ergonomics
State
PA
Performing Organization
Pennsylvania State University Park, University Park, Pennsylvania
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