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Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study
OBJECTIVES AND BACKGROUND: Social demands of the school-year and summer environment may affect children’s sleep patterns and circadian rhythms during these periods. The current study examined differences in children’s sleep and circadian-related behaviors during the school-year and summer and explor...
Autores principales: | , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273994/ https://www.ncbi.nlm.nih.gov/pubmed/34247639 http://dx.doi.org/10.1186/s12966-021-01165-0 |
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author | Moreno, Jennette P. Razjouyan, Javad Lester, Houston Dadabhoy, Hafza Amirmazaheri, Mona Reesor-Oyer, Layton O’Connor, Teresia M. Hernandez, Daphne C. Najafi, Bijan Alfano, Candice A. Crowley, Stephanie J. Thompson, Debbe Baranowski, Tom |
author_facet | Moreno, Jennette P. Razjouyan, Javad Lester, Houston Dadabhoy, Hafza Amirmazaheri, Mona Reesor-Oyer, Layton O’Connor, Teresia M. Hernandez, Daphne C. Najafi, Bijan Alfano, Candice A. Crowley, Stephanie J. Thompson, Debbe Baranowski, Tom |
author_sort | Moreno, Jennette P. |
collection | PubMed |
description | OBJECTIVES AND BACKGROUND: Social demands of the school-year and summer environment may affect children’s sleep patterns and circadian rhythms during these periods. The current study examined differences in children’s sleep and circadian-related behaviors during the school-year and summer and explored the association between sleep and circadian parameters and change in body mass index (BMI) during these time periods. METHODS: This was a prospective observational study with 119 children ages 5 to 8 years with three sequential BMI assessments: early school-year (fall), late school-year (spring), and beginning of the following school-year in Houston, Texas, USA. Sleep midpoint, sleep duration, variability of sleep midpoint, physical activity, and light exposure were estimated using wrist-worn accelerometry during the school-year (fall) and summer. To examine the effect of sleep parameters, physical activity level, and light exposure on change in BMI, growth curve modeling was conducted controlling for age, race, sex, and chronotype. RESULTS: Children’s sleep midpoint shifted later by an average of 1.5 h during summer compared to the school-year. After controlling for covariates, later sleep midpoints predicted larger increases in BMI during summer, (γ = .0004, p = .03), but not during the school-year. Sleep duration, sleep midpoint variability, physical activity levels, and sedentary behavior were not associated with change in BMI during the school-year or summer. Females tended to increase their BMI at a faster rate during summer compared to males, γ = .06, p = .049. Greater amounts of outdoor light exposure (γ = −.01, p = .02) predicted smaller increases in school-year BMI. CONCLUSIONS: Obesity prevention interventions may need to target different behaviors depending on whether children are in or out of school. Promotion of outdoor time during the school-year and earlier sleep times during the summer may be effective obesity prevention strategies during these respective times. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12966-021-01165-0. |
format | Online Article Text |
id | pubmed-8273994 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-82739942021-07-13 Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study Moreno, Jennette P. Razjouyan, Javad Lester, Houston Dadabhoy, Hafza Amirmazaheri, Mona Reesor-Oyer, Layton O’Connor, Teresia M. Hernandez, Daphne C. Najafi, Bijan Alfano, Candice A. Crowley, Stephanie J. Thompson, Debbe Baranowski, Tom Int J Behav Nutr Phys Act Research OBJECTIVES AND BACKGROUND: Social demands of the school-year and summer environment may affect children’s sleep patterns and circadian rhythms during these periods. The current study examined differences in children’s sleep and circadian-related behaviors during the school-year and summer and explored the association between sleep and circadian parameters and change in body mass index (BMI) during these time periods. METHODS: This was a prospective observational study with 119 children ages 5 to 8 years with three sequential BMI assessments: early school-year (fall), late school-year (spring), and beginning of the following school-year in Houston, Texas, USA. Sleep midpoint, sleep duration, variability of sleep midpoint, physical activity, and light exposure were estimated using wrist-worn accelerometry during the school-year (fall) and summer. To examine the effect of sleep parameters, physical activity level, and light exposure on change in BMI, growth curve modeling was conducted controlling for age, race, sex, and chronotype. RESULTS: Children’s sleep midpoint shifted later by an average of 1.5 h during summer compared to the school-year. After controlling for covariates, later sleep midpoints predicted larger increases in BMI during summer, (γ = .0004, p = .03), but not during the school-year. Sleep duration, sleep midpoint variability, physical activity levels, and sedentary behavior were not associated with change in BMI during the school-year or summer. Females tended to increase their BMI at a faster rate during summer compared to males, γ = .06, p = .049. Greater amounts of outdoor light exposure (γ = −.01, p = .02) predicted smaller increases in school-year BMI. CONCLUSIONS: Obesity prevention interventions may need to target different behaviors depending on whether children are in or out of school. Promotion of outdoor time during the school-year and earlier sleep times during the summer may be effective obesity prevention strategies during these respective times. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s12966-021-01165-0. BioMed Central 2021-07-12 /pmc/articles/PMC8273994/ /pubmed/34247639 http://dx.doi.org/10.1186/s12966-021-01165-0 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
spellingShingle | Research Moreno, Jennette P. Razjouyan, Javad Lester, Houston Dadabhoy, Hafza Amirmazaheri, Mona Reesor-Oyer, Layton O’Connor, Teresia M. Hernandez, Daphne C. Najafi, Bijan Alfano, Candice A. Crowley, Stephanie J. Thompson, Debbe Baranowski, Tom Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title | Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title_full | Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title_fullStr | Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title_full_unstemmed | Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title_short | Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
title_sort | later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8273994/ https://www.ncbi.nlm.nih.gov/pubmed/34247639 http://dx.doi.org/10.1186/s12966-021-01165-0 |
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