Cisse F, Martineaud R, Martineaud J P
Chaire de Physiologie, Faculté de Médecine, Université de Dakar, Sénégal.
Arch Int Physiol Biochim Biophys. 1991 Apr;99(2):155-9. doi: 10.3109/13813459109146956.
In order to appreciate eventual changes of the circadian rhythm of the body core temperature induced by hot climates, we measured for 24 h periods in summer (June) and in winter (December), in Senegal (latitude, 25 degrees north), the central temperature in two groups of 45 and 58 young soldiers living permanently in the Sahelian area. The subjects were free-running but without any strong activity during the experiments. Rectal temperatures were measured at rest each 3 h, in natural environment: in winter ambient temperature varied from 21 to 25 degrees C and in summer from 28 to 42 degrees C. We observed no change in the shape of the circadian cycle: minimal values were seen at 3 AM and maximal at 3 or 6 PM. But during the hot season, we observed increase of the mesor (36.85 and 37.10 degrees C, in december and june respectively) and of the amplitude of the nycthemeral variation (0.85 and 1.37 degrees C respectively). These results demonstrate a clear adaptation to high ambient temperatures in man, similar to that observed in other mammals.
为了了解炎热气候对人体核心体温昼夜节律的潜在影响，我们在塞内加尔（北纬25度），于夏季（6月）和冬季（12月）对两组分别为45名和58名长期居住在萨赫勒地区的年轻士兵进行了为期24小时的中心体温测量。实验期间，受试者自由活动，但无剧烈运动。在自然环境中，每隔3小时测量一次静息时的直肠温度：冬季环境温度在21至25摄氏度之间变化，夏季在28至42摄氏度之间变化。我们观察到昼夜节律的形状没有变化：最低值出现在凌晨3点，最高值出现在下午3点或6点。但在炎热季节，我们观察到中值（12月和6月分别为36.85和37.10摄氏度）和昼夜变化幅度（分别为0.85和1.37摄氏度）有所增加。这些结果表明，人类对高环境温度有明显的适应性，类似于在其他哺乳动物中观察到的情况。
