Bedtime and evening light exposure influence circadian timing in preschool-age children: A field study.
Bedtime and evening light exposure influence circadian timing in preschool-age children: A field study.
复制标题
DOI：
10.1016/j.nbscr.2016.11.002
复制
发表时间：
2016-11
影响因子：
--
通讯作者：
LeBourgeois, Monique K.
中科院分区：
文献类型：
--
作者：
Akacem, Lameese D.;Wright, Kenneth P., Jr.;LeBourgeois, Monique K.
光照和睡眠时间是影响人类生物钟计时的个体间变异性的两个因素。这项研究的目的是量化晚光暴露在多大程度上预测学龄前儿童在睡前和睡前的昼夜节律变化。研究对象为21名儿童，年龄为4.5-5.0岁(4.7±0.2岁；9名女性)。孩子们遵循他们典型的睡眠时间表4天，在此期间，他们佩戴手腕活动计来评估睡眠时间，并佩戴吊坠光计来测量以勒克斯为单位的每分钟照度水平。在第5天，孩子们参加了家庭暗光褪黑素发作(DLMO)评估。在DLMO评估之前的4个晚上，睡前2小时的光照暴露量被平均并汇总。平均DLMO为19：22±01：04，平均睡前为20：07±00：46。平均夜间光照为710.1±1418.2勒克司。睡眠时间较晚(关灯时间)的儿童褪黑素起效时间较晚(r=0.61，p=0.002)。晚光暴露与DLMO没有独立的相关性(r=0.32，p=0.08)；然而，在控制睡前因素后，晚光暴露与DLMO之间存在偏相关(r=0.46，p=0.02)。睡前时间解释了DLMO时间差异的37.3%，晚间光线暴露解释了另外13.3%的差异。这些发现在理解影响学龄前儿童昼夜节律的因素方面迈出了重要的一步，并对理解一条可改变的途径具有重要意义，该途径可能是儿童早期晚睡时间和夜间解决问题发展的基础。
Light exposure and sleep timing are two factors that influence inter-individual variability in the timing of the human circadian clock. The aim of this study was to quantify the degree to which evening light exposure predicts variance in circadian timing over and above bedtime alone in preschool children. Participants were 21 children ages 4.5–5.0 years (4.7±0.2 years; 9 females). Children followed their typical sleep schedules for 4 days during which time they wore a wrist actigraph to assess sleep timing and a pendant light meter to measure minute-by-minute illuminance levels in lux. On the 5th day, children participated in an in-home dim-light melatonin onset (DLMO) assessment. Light exposure in the 2 h before bedtime was averaged and aggregated across the 4 nights preceding the DLMO assessment. Mean DLMO and bedtime were 19:22±01:04 and 20:07±00:46, respectively. Average evening light exposure was 710.1±1418.2 lux. Children with later bedtimes (lights-off time) had more delayed melatonin onset times (r=0.61, p=0.002). Evening light exposure was not independently associated with DLMO (r=0.32, p=0.08); however, a partial correlation between evening light exposure and DLMO when controlling for bedtime yielded a positive correlation (r=0.46, p=0.02). Bedtime explained 37.3% of the variance in the timing of DLMO, and evening light exposure accounted for an additional 13.3% of the variance. These findings represent an important step in understanding factors that influence circadian phase in preschool-age children and have implications for understanding a modifiable pathway that may underlie late sleep timing and the development of evening settling problems in early childhood.
登录
查看更多内容
影响因子：
2.5
作者：
DEACON, S;ARENDT, J
通讯作者：
ARENDT, J
影响因子：
4.4
作者：
Berger RH;Miller AL;Seifer R;Cares SR;LeBourgeois MK
通讯作者：
LeBourgeois MK
影响因子：
5.6
作者：
Chan, Joey Wing Yan;Lam, Siu Ping;Wing, Yun-Kwok
通讯作者：
Wing, Yun-Kwok
影响因子：
3.5
作者：
Kawinska, A;Dumont, M;Carrier, J
通讯作者：
Carrier, J
影响因子：
5.6
作者：
Crowley, Stephanie J.;Acebo, Christine;Carskadon, Mary A.
通讯作者：
Carskadon, Mary A.