Abstract

The purpose of this study was to verify the relationship of the occurrence of low body temperature at rising time and intraday body temperature changes, rising time, going-to-bed time, exercise hours, heart rate at rising time, and intrinsic motivation for attending school at rising time. The subjects, 452 healthy junior and senior high school male students, were divided into two groups, namely, Average group (AG) with an axillary temperature above 36.0 and below 37.0 at rising time and Low group (LG) with an axillary temperature below 36.0. The temperature was taken on a weekday without physical exercise classes in school in June 1999 and in the same month in 2001. The level of intraday body temperature of LG was lower than that of AG. The body temperature of AG reached its peak around noon, but that of LG peaked around 4 o'clock in the afternoon. The body temperature at going-to-bed time of LG did not get lower to the level at rising time. The heart rate of LG (66.6 +/- 9.0 beat/min) was significantly lower than that of AG (70.9 +/- 10.7 beat/min). The intrinsic motivation for attending school of LG (3.0 +/- 1.1 points) was significantly lower than that of AG (3.6 +/- 1.2 points). Those with the above motivation in LG (36.6%) were significantly smaller in number than those in AG (54.4%). The students with an axillary temperature below 36.0 at rising time were found to have characteristically lower level of intraday body temperature, showing the highest at around 4 o'clock in the afternoon. Also their going-to-bed time temperature did not go lower to the level of rising time. Furthermore, their heart rate was low at rising time and they were low in the intrinsic motivation for attending school at rising time. Verf.-Referat