The potential of a year-round school calendar for maintaining children's weight status and fitness: Preliminary outcomes from a natural experiment.
Children
Intervention
Obesity
Overweight
Policy
School calendar
Journal
Journal of sport and health science
ISSN: 2213-2961
Titre abrégé: J Sport Health Sci
Pays: China
ID NLM: 101606001
Informations de publication
Date de publication:
01 2020
01 2020
Historique:
received:
04
12
2018
revised:
02
03
2019
accepted:
24
04
2019
entrez:
11
1
2020
pubmed:
11
1
2020
medline:
11
1
2020
Statut:
ppublish
Résumé
To evaluate the potential of a year-round school calendar (180-day school year distributed across 12 months) as an intervention compared to a traditional school calendar (180-day school year distributed across 9 months) for mitigating children's weight gain and fitness loss via a natural experiment. Height, weight, and cardiorespiratory fitness (CRF) (i.e., Fitnessgram Progressive Aerobic Cardiovascular Endurance Run) were measured in children (5-12 years old) in 3 schools (2 traditional, 1 year-round, Year-round students gained less BMI (difference in ∆ = -0.44, 95% confidence interval (CI): -0.67 to -0.03) and less CRF (difference in ∆ = -1.92, 95%CI: -3.56 to -0.28) than students attending a traditional school overall. Compared with traditional students, during both summers, year-round students gained less BMI (summer 2017 difference in ∆ = -0.15, 95%CI: -0.21 to -0.08; summer 2018 difference in ∆ = -0.16, 95%CI: -0.24 to -0.07) and zBMI (summer 2017 difference in ∆ = -0.032, 95%CI: -0.050 to -0.010; summer 2018 difference in ∆ = -0.033, 95%CI: -0.056 to -0.009), and increased CRF (summer 2017 difference in ∆ = 0.40, 95%CI: 0.02-0.85; summer 2018 difference in ∆ = 0.23, 95%CI: -0.25 to 0.74). However, the opposite was observed for the school year, with traditional students gaining less BMI and zBMI and increasing CRF compared with year-round students (difference in BMI ∆ = 0.05, 95%CI: 0.03-0.07; difference in zBMI ∆ = 0.012, 95%CI: 0.005-0.019; difference in Progressive Aerobic Cardiovascular Endurance Run laps ∆ = -0.43, 95%CI: -0.58 to -0.28). The year-round school calendar had a small beneficial impact on children's weight status but not CRF. It is unclear if this benefit to children's weight would be maintained because gains made in the summer were largely erased during the school year. Trajectories of weight and CRF gain/loss were consistent with the structured days hypothesis.
Identifiants
pubmed: 31921477
doi: 10.1016/j.jshs.2019.05.006
pii: S2095-2546(19)30067-5
pmc: PMC6943754
doi:
Types de publication
Journal Article
Observational Study
Research Support, N.I.H., Extramural
Langues
eng
Pagination
18-27Subventions
Organisme : NICHD NIH HHS
ID : R21 HD095164
Pays : United States
Informations de copyright
© 2019 Published by Elsevier B.V. on behalf of Shanghai University of Sport.
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