Moderately Cold Environment

A study on the effects of different color temperatures of fluorescent lamps on skin and rectal temperatures in a moderately cold environment involving Ci) changes in skin temperature of 7 male subjects exposed to an ambient temperature ranging from 28"C to 180C (experiment I) and (ii) changes in skin and rectal temperatures and metabolic heat production of 11 male subjects exposed to ambient temperature of 15eC for 90 min (Experiment II) was conducted, In Experiment I, the reduction ofmean skin temperature from the control value was significantly greater under 3000 K than under 5000 K or 7500 K lighting. In Experiment II, the reductions in mean skin temperature and rectal temperature were respectively greater and smaller under 3000 K than those under 5000 K or 7500 K lighting, However, metabolic heat production was not affected by color temperature conditions. The relationships between morphological and physiological parameters revealed that no signifieant re]ation of rectal temperature to body surface area per unit body weight was found only under 3000 K. Furthermore, while the mean skin temperature was independent on the mean skinfold thickness tmder 3000 K, a signifieant negative correlation between the rectal and mean skin temperatures was observed. Therefore, body heat loss might be suppressed effeetively by increasing the vasoconstrictor tone under a color temperature of 3000 K, and the body shell was dependent only on morphologic:al factors under 5000 K and 7500 K lighting. J Physiol Anehropot, 19 (t9): le5-134, 2000 http:Zlu.iww.,7'stage.j'st.go.j'plen/