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Each subject was examined for three working days of a single week in both summer May - June and winter Dec - Jan. A combination of these works throughout the work shift interspersed with periods of rest pauses might have prevented the worker from experiencing an extreme level of cardiac strain. The heat exposure limits suggested for industrial situation therefore should be reduced to a lower level for this group. On site observations were conducted for work study. Evaluation of physiological strain of shovellers in underground coal mines in India. Seasonal comparisons were done by the paired t -test analysis between 12 pairs of summer and 16 pairs of winter means. Heart Rate and spontaneous work cycles during exposure to heat. Assessment of physiological strain in inland fishing activity.