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Pediatrics

Night time sleep macrostructure is altered in otherwise healthy 10-year-old overweight children

Abstract

Objective:

Epidemiological evidence shows an inverse relationship between sleep duration and overweight/obesity risk. However, there are few polysomnographic studies that relate the organization of sleep stages to pediatric overweight (OW). We compared sleep organization in otherwise healthy OW and normal-weight (NW) 10-year-old children.

Subjects:

Polysomnographic assessments were performed in 37 NW and 59 OW children drawn from a longitudinal study beginning in infancy. Weight and height were used to evaluate body mass index (BMI) according to international criteria. Non-rapid eye movement (NREM) sleep (stages N1, N2 and N3), rapid eye movement (REM) sleep (stage R) and wakefulness (stage W) were visually scored. Sleep parameters were compared in NW and OW groups for the whole sleep period time (SPT) and for each successive third of it using independent Student’s t-tests or nonparametric tests. The relationship between BMI and sleep variables was evaluated by correlation analyses controlling for relevant covariates.

Results:

The groups were similar in timing of sleep onset and offset, and sleep period time. BMI was inversely related to total sleep time (TST) and sleep efficiency. OW children showed reduced TST, sleep efficiency and stage R amount, but higher stage W amount. In analysis by thirds of the SPT, the duration of stage N3 episodes was shorter in the first third and longer in the second third in OW children as compared with NW children.

Conclusions:

Our results show reduced sleep amount and quality in otherwise healthy OW children. The lower stage R amount and changes involving stage N3 throughout the night suggest that OW in childhood is associated with modifications not only in sleep duration, but also in the ongoing night time patterns of NREM sleep and REM sleep stages.

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Acknowledgements

We are grateful to the children and their parents who have made this research possible and the technicians and personnel for their valuable collaboration. This study was supported by grants from Chilean Agency for Funding in Science and Technology (CONICYT, Fondecyt 1110513 and 1120319) and the US National Institutes of Health (NIH R01 HD33487).

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Correspondence to R Chamorro.

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Chamorro, R., Algarín, C., Garrido, M. et al. Night time sleep macrostructure is altered in otherwise healthy 10-year-old overweight children. Int J Obes 38, 1120–1125 (2014). https://doi.org/10.1038/ijo.2013.238

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