Physical activity, melatonin concentrations, and circadian rhythm of oral body temperature in children with low waking basal body temperature

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The purpose of this study was to investigate the daily physical activity, the melatonin concentrations, and circadian rhythm of body temperature in children with low waking basal body temperature. The subjects (nine-ten yrs) were evaluated for oral body temperature (OBT) and daily physical activity over an one week period. Melatonin was also measured at bed time. Low temperature group (LOW) was defined as > 1 SD below the mean waking OBT.1) Morning-Evening score was correlated with the daily physical activity, that is high physical activity group is morning type.2) An insufficient decline in bedtime OBT was observed in low physical activity group.3) There was a significant positive correlation between the daily physical activity and the melatonin concentration of bedtime.4) There was a significant positive correlation between the daily physical activity and ΔOBT (waking OBT-BT in bedtime).5) The delayed time of minimum body temperature in children with low waking basal body temperature were compared with the children of the normal waking body temperature was observed.6) The OBT of waking, noon, and bedtime in winter were significantly lower than these in summer, respectively. However, there was no significant difference between summer and winter of the waking OBT in the group was observed the increase in physical activity.Our results suggest that the lower level of physical activity may affect OBT circadian rhythm. Our data also suggest that low waking OBT may be associated with delayed OBT circadian rhythm.