Abstract
Four subjects each of the young and middle-aged, males and females were exposed to 16, 18, 20, or 22°C on the separate days. Relative humidity was 50% and air velocity was 18 cm/s. They kept rest on chairs for 60 minutes and then performed a sedentary work and a muscular mork ; stepping up and down for 15cm high platform 12 tims/min for 45 minutes each. Metabolic rate of the sedentary work was 45-60 kcal/m2h and that of the muscular work was 110-120 kcal/m2h. Clothes were prepared previously for each subject as they could choose and change the clothes according to their thenTlal sensations. The clothing conditions at rest under each thermal condition were almost the same as those during the sedentary and muscular work. Aithough there was a close relationship between room temperature exposed and clo-value of the clothes assembly chosen by the subjects, a warm sensation still arose by the increase of the the room temperature. From the relationships among the room temperature, clothing condition and therrnal sensation, clothing assembly of 1.0 (young males) to l.5 (middle-aged females) clo was necessary in 18°C and 0.8 to 1.3 clo in 20°C at rest. During muscular work, the necessary clothing assembly was decreased by about 0.1 clo in comparison with at rest.
