الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
The present investigation was conducted in order to
evaluate the effect of ambient temperature (five levels:
20, 26, 30, 35, and 40°C Wet-Bulb Globe Temperature), work/
rest ratio (two ratios: 2/1 and 3/1), time on task (120
minutes for 20, 26, and 30°C WBGT climates, 90 minutes for
35°C WBGT climate, and 45 minutes for 40°C WBGT climate),
and their interactions, on human performanceo The performance
measure was a compensatory one-dimens’iona1 vertical tracking
tasko
An environmental chamber was established and equipped
to suit the present investigationo The electronic circuits
needed for producing the controlled signal in the tracking
task, and for measuring the error in performing the task,
were also designed and constructedo
Six male, fit, acclimatized, under-graduate students,
aged from 20 to 23 years were used as subjectso A comp1ete1y
randomized factorial design was used to analyze the
resu1tso The significant differences between the main
effects and interactions’ levels were determined by means
of Duncan Multiple Range tests at 001 and 005 significance
levelso
The significant conclusions drawn from the results of
this investigation were ”’I
(1) Hot environments cause highly significant decrement
in vertical compensatory tracking performance (at the 1 percent
level). This significant deterioration in tracking
performance takes place with varying amounts by increasing
the ambient temperature from any level to any other adjacent
level within the levels of temperature used in this
investigation (20,26, 30, 35, and 40°C WBGT).
(2) By raising the ambient temperature from 20°C WBGT
to 26°C WBGT, the tracking error score is approximately doubled,
while the rise of ambient temperature from any other level
under investigation to the next succeeding level does not
produce as great a deterioration in the tracking performance.
(3) A particular motivation regieme did not totally com-
pensate or perhaps have any effect on the deterioration
occurring in tracking performance due to exposure to hot
environments. Hence, work practices appear to be even more
desirably employed when performing critical tasks, i.e.,
those which require high level of performance, under hot
environments.
(4) Tracking performance under work/rest ratio of 2/1
does not differ significantly from that under work/rest ratio
of 3/1 in thermal environment when the work period does not
exceed 30 minutes.