Department of Human Development and Family Studies, Purdue University, West Lafayette, Indiana, USA.
Department of Psychology, The George Washington University, Washington, DC, USA.
Obesity (Silver Spring). 2019 Apr;27(4):645-652. doi: 10.1002/oby.22420. Epub 2019 Feb 28.
This study aimed to examine associations between sleep duration, BMI, and cortisol levels across childhood.
Participants included 361 children adopted domestically in the United States. Random-intercept cross-lagged panel models tested for between-person and bidirectional within-person associations of sleep duration, BMI, and morning and evening cortisol at age 4.5 to 9 years.
Sleep duration and BMI were stable during childhood, inversely associated at the between-person level, and unrelated to morning or evening cortisol. BMI at age 6 years predicted longer sleep duration and lower evening cortisol at age 7 years, and lower morning cortisol at age 7 years predicted higher BMI at age 9 years within individuals.
The association between sleep and BMI is more likely a stable between-person phenomenon rather than a unidirectional association that develops within individuals over time.
本研究旨在探讨儿童期睡眠时长、BMI 和皮质醇水平之间的关联。
研究对象包括 361 名在美国国内被收养的儿童。随机截距交叉滞后面板模型测试了睡眠时长、BMI 以及 4.5 至 9 岁时的晨、晚皮质醇在个体间和个体内的双向关联。
儿童期的睡眠时长和 BMI 较为稳定，个体间呈负相关，与晨、晚皮质醇无关。6 岁时的 BMI 预测 7 岁时的睡眠时长更长、晚间皮质醇更低，7 岁时的晨皮质醇更低预测 9 岁时的 BMI 更高。
睡眠和 BMI 之间的关联更可能是个体间稳定的现象，而不是个体随时间发展的单向关联。
