【摘 要】
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Background:Public health guidelines have called for innovative and flexible physical activity(PA)intervention strategies to promote PA and health amid the coronavirus disease 2019(COVID-19)pandemic.Therefore,this study\'s purpose was to examine the effe
【机 构】
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School of Kinesiology,University of Minnesota-Twin Cities,Minneapolis,MN 55455,USA;Carlson School of
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Background:Public health guidelines have called for innovative and flexible physical activity(PA)intervention strategies to promote PA and health amid the coronavirus disease 2019(COVID-19)pandemic.Therefore,this study\'s purpose was to examine the effects of a home-based,YouTube-delivered PA intervention grounded in self-determination theory on young adults\'free-living PA,sedentary behavior,and sleep quality(NCT04499547).Methods:Sixty-four young adults(48 females;age=22.8±3.4 years,mean±SD;body mass index=23.1±2.6 kg/m2)were randomized(1∶1)into the intervention group,which received weekly aerobic and muscle-strengthening PA videos,or control group,which received weekly gen-eral health education videos,for 12 weeks.Our primary outcome was free-living moderate-to-vigorous PA(MVPA)and our secondary out-comes were sedentary behavior,light PA,and sleep quality(measured using ActiGraph accelerometers)along with muscle-strengthening PA frequency,self-determination theory-related motivation(non-regulation,external regulation,introjected regulation,identified regulation,inte-grated regulation,and intrinsic regulation),and perceived PA barriers(assessed using validated questionnaires).Repeated measures analysis of variances(ANOVAs)examined between-group differences at an adjusted significance level of 0.004 and effect sizes as partial eta-squared(ηp2).Results:We observed statistically significant interaction effects for MVP A,sleep efficiency,muscle-strengthening PA frequency,non-regulation,integrated regulation,intrinsic regulation,and perceived PA barriers(F(1,62)=10.75-77.67,p＜0.001-0.002,ηp2=0.15-0.56)with all out-comes favoring the intervention group.We observed no statistically significant differences in either group for sedentary behavior,light PA,sleep duration,or external,introjected,and identified regulations after 12 weeks(F(l,62)=1.11-3.64,p=0.06-0.61).Conclusion:With national COVID-19 restrictions still in place and uncertainty regarding post-pandemic PA environments and behaviors,a remote,YouTube-delivered PA intervention may help foster clinically meaningful improvements in young adults\'free-living MVPA,muscle-strengthening PA frequency,sleep efficiency,PA-related intrinsic motivation,and perceived PA barriers.
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