TY - JOUR
T1 - Effect of nationwide school policy on device-measured physical activity in Danish children and adolescents: a natural experiment
AU - Pedersen, Natascha Holbæk
AU - Grøntved, Anders
AU - Brønd, Jan Christian
AU - Møller, Niels Christian
AU - Larsen, Kristian Traberg
AU - Debrabant, Birgit
AU - Koch, Sofie
AU - Troelsen, Jens
AU - Brage, Søren
AU - Schipperijn, Jasper
AU - Hjelmborg, Jacob
AU - Wedderkopp, Niels
AU - Christiansen, Lars Breum
AU - Kristensen, Peter Lund
PY - 2023/3/1
Y1 - 2023/3/1
N2 - Background: A new Danish school policy with a requirement for 45 min physical activity daily during school hours was introduced in 2014. The objective of this natural experiment was to evaluate the effect of this nationwide school policy on physical activity in Danish children and adolescents.Methods: Four historical studies completed between 2009 and 2012 comprised the pre-policy study population. Post-policy data were collected in 2017/18. All post-policy schools were represented in the four pre-policy studies. Age-groups and seasons were matched. In total, 4816 children and adolescents aged 6–17 were included in the analyses (2346 pre-policy and 2470 post-policy). Children and adolescents were eligible if they had accelerometer measurements and did not have any physical disabilities preventing activity. Physical activity was measured by accelerometry. Main outcome was any bodily movement. Secondary outcomes were moderate to vigorous physical activity and overall movement volume (mean counts per minute).Findings: The school policy interrupted a linear decreasing pre-policy trend in physical activity during school hours. All activity outcomes increased post-policy during a standardized school day (8:10 am–1 pm). Increases were more pronounced in the youngest children. Specifically, we observed a daily increase during a standardized school day in 2017/2018 of 14.2 min of movement (95% CI: 11.4–17.0, p < 0.001), 6.5 min of moderate to vigorous physical activity (95% CI: 4.7–8.3, P < 0.001), and 141.8 counts per minute (95% CI: 108.5–175.2, P < 0.001).Interpretation: A national school policy may be an important strategy to increase physical activity during school hours among children and adolescents.
AB - Background: A new Danish school policy with a requirement for 45 min physical activity daily during school hours was introduced in 2014. The objective of this natural experiment was to evaluate the effect of this nationwide school policy on physical activity in Danish children and adolescents.Methods: Four historical studies completed between 2009 and 2012 comprised the pre-policy study population. Post-policy data were collected in 2017/18. All post-policy schools were represented in the four pre-policy studies. Age-groups and seasons were matched. In total, 4816 children and adolescents aged 6–17 were included in the analyses (2346 pre-policy and 2470 post-policy). Children and adolescents were eligible if they had accelerometer measurements and did not have any physical disabilities preventing activity. Physical activity was measured by accelerometry. Main outcome was any bodily movement. Secondary outcomes were moderate to vigorous physical activity and overall movement volume (mean counts per minute).Findings: The school policy interrupted a linear decreasing pre-policy trend in physical activity during school hours. All activity outcomes increased post-policy during a standardized school day (8:10 am–1 pm). Increases were more pronounced in the youngest children. Specifically, we observed a daily increase during a standardized school day in 2017/2018 of 14.2 min of movement (95% CI: 11.4–17.0, p < 0.001), 6.5 min of moderate to vigorous physical activity (95% CI: 4.7–8.3, P < 0.001), and 141.8 counts per minute (95% CI: 108.5–175.2, P < 0.001).Interpretation: A national school policy may be an important strategy to increase physical activity during school hours among children and adolescents.
KW - Physical activity
KW - School policy
KW - Health policy
KW - Children and adolescents
KW - Children and adolescents
KW - Health policy
KW - Physical activity
KW - School policy
U2 - 10.1016/j.lanepe.2022.100575
DO - 10.1016/j.lanepe.2022.100575
M3 - Journal article
C2 - 36895450
SN - 2666-7762
VL - 26
JO - The Lancet Regional Health - Europe
JF - The Lancet Regional Health - Europe
M1 - 100575
ER -