Pulse rate and energy expenditure were measured on fifteen male subjects who had been given ergometer cycling of #x2018;O#x2019; and 32#xB7;6#xA0;W to 97#xB7;8#xA0;W in three temperatures of 22#xB0;C, 30#xB0;C, and 37#xB0;C. The variation in pulse rate of each graded work period was compared with the variation in energy expenditure for each environmental temperature. The pulse rate was significantly increased with the rise of environmental temperature (p#xA0;#xA0;0#xB7;01) whereas the energy expenditure (kJ#xA0;min#x2212;1) was consistently or effectively decreased with higher graded work. However, a correlation was obtained between the pulse rate and energy expenditure during graded work up to a limit of 150 beats min#x2212;1, 160 beats min#x2212;1, and 170 beats min#x2212;1in temperatures of 22#xB0;C, 30#xB0;C, and 37#xB0;C respectively. The results were analysed by computing the analysis of variance and regression equation evaluated for each temperature, indicating that independent regression lines having two components, one above 95 and other below 95 beats min#x2212;1were required in each set of temperature. The percentage error between observed and predicted values (pooled) or energy expenditure for the two ranges of pulse rates varied from 0#xB7;3 to 11#xB7;5 and from 0#xB7;5 to 9#xB7;5 respectively in the three temperatures.
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