The experiment was conducted at instructional Farm, CTAE, Udaipur. The experiment was conducted during the agricultural operation of wheat harvesting. Ten female farm workers were identified from the workers population in the age group of 20 to 40 years. The experiment was designed for three WBGT conditions i.e. 28, 29 and 30ºC which falls under the heat stress category as per ACGIH norms. Since it is very difficult to achieve exact WBGT condition in the field, therefore a variation of ± 0.5ºC was assumed in the open field conditions. During the experiment oral temperature, mean skin temperature, heart rate and overall discomfort rate were measured. The increase in resting oral temperature was observed from 36.67°C to 36.75°C whereas increase in working oral temperature was observed from 37.11°C to 37.26°C with the increase in WBGT. Increase in resting mean skin temperature from 29.25°C to 30.39°C whereas increase in working mean skin temperature was observed from 32.85°C to 34.55°C with the increase in WBGT. Increase in resting heart rate was observed from 76 to 81beats/min whereas increase in working heart rate was observed from 92 to 102 beats/min with the increase in WBGT. Increase in resting ODR was observed from 1.5 to 1.8 whereas increase in working ODR was observed from 4.9 to 6.7 with the increase in WBGT.

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