Investigation of heat strain and the validity of thermal standard about older worker

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Field study about construction workers in summer showed that heat stress of the working environment was highest in the first half of afternoon work and that heart rate, water loss, deep body temperature of workers were high. The average water deficit per body weight was 1.2% at the end of work shift. About half of the workers were over the standards of ACGIH-TLV. The water intake was about 50% of the water deficit, which could cause dehydration during work. To alleviate high heat strain during work, the data showed that it was important to take enough food, beverage and rest in lunch.A precise estimation of metabolic rate of outdoor workers in summer is necessary to apply the heat stress standards, such as ISO7243. By subjective study, we developed precise metabolic rate prediction equation of younger and older men by using heart rate reserve or heart rate net in addition to body weight, body fat percentage and ambient temperature.