Park S J, Tokura H
Department of Environmental Health, Nara Women's University, Nara, 630-8506, Japan.
Jpn J Physiol. 1998 Apr;48(2):149-56. doi: 10.2170/jjphysiol.48.149.
This study investigated the effects of three different types of clothing on the circadian rhythms of core temperature and urinary catecholamines. One type of clothing consisted of long-sleeved shirts, full-length trousers, and socks (Type L, 1,042 g); the second type was of half-sleeved shirts and knee-length trousers (Type H, 747 g); the third type was of Type H during the daytime and Type L during night sleep (Type M). Six healthy females participated in this study where rectal temperature, skin temperatures, heart rate, and urinary catecholamines were continuously measured for 37.5 h at an ambient temperature of 23.8 +/- 0.2 degrees C and a relative humidity of 60 +/- 5%. The results were as follows: (1) The nocturnal minimum of rectal temperature decreased significantly in the sequence Type L < Type M < Type H clothing, and 27.2 and 12.4% of the circadian amplitude were influenced by type of clothing during the daytime and the nighttime, respectively. (2) The rise of skin temperatures in the extremities increased significantly more after the subjects retired for sleep with Type M or Type H clothing than with Type L. (3) Urinary catecholamines decreased more in the evening and increased more in the morning with Type H and Type M clothing than with Type L. These results show that the circadian rhythm of core temperature, especially the nocturnal minimum value, was influenced by the type of clothing worn not only during the nighttime, but also during the daytime.
本研究调查了三种不同类型的服装对核心体温昼夜节律和尿儿茶酚胺的影响。一种服装包括长袖衬衫、长裤和袜子（L型，1042克）；第二种是短袖衬衫和齐膝长裤（H型，747克）；第三种是白天穿H型、夜间睡眠穿L型（M型）。六名健康女性参与了本研究，在环境温度为23.8±0.2摄氏度、相对湿度为60±5%的条件下，连续37.5小时测量直肠温度、皮肤温度、心率和尿儿茶酚胺。结果如下：（1）直肠温度的夜间最低值按L型＜M型＜H型服装的顺序显著降低，昼夜振幅的27.2%和12.4%分别在白天和夜间受服装类型影响。（2）与L型服装相比，穿着M型或H型服装入睡后，四肢皮肤温度的上升幅度显著更大。（3）与L型服装相比，穿着H型和M型服装时，尿儿茶酚胺在晚上下降更多，在早上上升更多。这些结果表明，核心体温的昼夜节律，尤其是夜间最低值，不仅在夜间，而且在白天都受到所穿服装类型的影响。
