Frascarolo P, Schutz Y, Jéquier E
Institute of Physiology, Faculty of Medicine, University of Lausanne, Switzerland.
J Appl Physiol (1985). 1990 Dec;69(6):2029-33. doi: 10.1152/jappl.1990.69.6.2029.
To study the influence of the menstrual cycle on whole body thermal balance and on thermoregulatory mechanisms, metabolic heat production (M) was measured by indirect calorimetry and total heat losses (H) were measured by direct calorimetry in nine women during the follicular (F) and the luteal (L) phases of the menstrual cycle. The subjects were studied while exposed for 90 min to neutral environmental conditions (ambient temperature 28 degrees C, relative humidity 40%) in a direct calorimeter. The values of M and H were not modified by the phase of the menstrual cycle. Furthermore, in both phases the subjects were in thermal equilibrium because M was similar to H (69.7 +/- 1.8 and 72.1 +/- 1.8 W in F and 70.4 +/- 1.9 and 71.4 +/- 1.7 W in L phases, respectively). Tympanic temperature (Tty) was 0.24 +/- 0.07 degrees C higher in the L than in the F phase (P less than 0.05), whereas mean skin temperature (Tsk) was unchanged. Calculated skin thermal conductance (Ksk) was lower in the L (17.9 +/- 0.6 W.m-2.degrees C-1) than in the F phase (20.1 +/- 1.1 W.m-2.degrees C-1; P less than 0.05). Calculated skin blood flow (Fsk) was also lower in the L (0.101 +/- 0.008 l.min-1.m-2) than in the F phase (0.131 +/- 0.015 l.min-1.m-2; P less than 0.05). Differences in Tty, Ksk, and Fsk were not correlated with changes in plasma progesterone concentration. It is concluded that, during the L phase, a decreased thermal conductance in women exposed to a neutral environment allows the maintenance of a higher internal temperature.
为研究月经周期对全身热平衡及体温调节机制的影响，在9名女性月经周期的卵泡期（F）和黄体期（L），通过间接测热法测量代谢产热（M），并通过直接测热法测量总热损失（H）。受试者在直接热量计中暴露于中性环境条件（环境温度28℃，相对湿度40%）90分钟期间接受研究。M和H的值不受月经周期阶段的影响。此外，在两个阶段受试者均处于热平衡状态，因为M与H相似（卵泡期分别为69.7±1.8和72.1±1.8瓦，黄体期分别为70.4±1.9和71.4±1.7瓦）。黄体期鼓膜温度（Tty）比卵泡期高0.24±0.07℃（P<0.05），而平均皮肤温度（Tsk）未改变。计算得出的皮肤热传导率（Ksk）在黄体期（17.9±0.6瓦·米-2·℃-1）低于卵泡期（20.1±1.1瓦·米-2·℃-1；P<0.05）。计算得出的皮肤血流量（Fsk）在黄体期（0.101±0.008升·分钟-1·米-2）也低于卵泡期（0.131±0.015升·分钟-1·米-2；P<0.05）。Tty、Ksk和Fsk的差异与血浆孕酮浓度的变化无关。得出结论，在黄体期，暴露于中性环境的女性热传导率降低，从而能维持较高的体内温度。
