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

本研究的目的是探讨低醒时基础体温儿童的日常体力活动、褪黑激素浓度和体温昼夜节律。受试者（9 - 10岁）在一周的时间内评估口腔体温（OBT）和日常体力活动。在睡觉时间也测量褪黑素。低温组（Low）定义为低于平均清醒ob0 1 SD。1)早晚评分与每日体力活动相关，即高体力活动组为晨型。2)低体力活动量组就寝时间OBT下降不充分。3)每日体力活动与就寝时间褪黑激素浓度显著正相关。4)日常体力活动与ΔOBT（睡前醒着的OBT-BT）存在显著正相关。5)比较低醒时基础体温患儿与正常醒时基础体温患儿最低体温延迟时间。6)冬季醒时、中午和就寝时间的OBT均显著低于夏季。然而，夏天和冬季之间没有显著差异，在醒着的OBT组中观察到体力活动的增加。我们的研究结果表明，较低的体力活动水平可能会影响OBT的昼夜节律。我们的数据还表明，低醒的OBT可能与延迟的OBT昼夜节律有关。

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.