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.

Daniel J.McDonough;Melina A.Helgeson;Wenxi Liu;Zan Gao

School of Kinesiology,University of Minnesota-Twin Cities,Minneapolis,MN 55455,USA;Carlson School of Management,University of Minnesota-Twin Cities,Minneapolis,MN 55455,USA

运动与健康科学（英文）

[1]Daniel J.McDonough;Melina A.Helgeson;Wenxi Liu;Zan Gao-.Effects of a remote,YouTube-delivered exercise intervention on young adults'physical activity,sedentary behavior,and sleep during the COVID-19 pandemic:Randomized controlled trial)[J].运动与健康科学（英文）,2022(02):145-156

NCT04499547,introjected,ANOVAs

Effects,remote,YouTube,delivered,exercise,intervention,young,adults,physical,activity,sedentary,sleep,during,pandemic,Randomized,controlled,trial,Background,Public,health,guidelines,have,called,innovative,flexible,strategies,promote,amid,coronavirus,disease,Therefore,this,study,purpose,was,effects,home,grounded,self,determination,theory,free,living,quality,Methods,Sixty,four,females,age,years,body,mass,were,randomized,into,group,which,received,weekly,aerobic,muscle,strengthening,videos,gen,eral,education,weeks,Our,primary,outcome,moderate,vigorous,MVPA,secondary,comes,light,measured,using,ActiGraph,accelerometers,along,frequency,related,motivation,external,identified,intrinsic,perceived,barriers,assessed,validated,questionnaires,Repeated,measures,analysis,variances,examined,between,differences,adjusted,significance,level,sizes,partial,eta,squared,p2,Results,We,observed,statistically,significant,interaction,efficiency,integrated,favoring,either,duration,regulations,after,Conclusion,With,national,restrictions,still,place,uncertainty,regarding,post,environments,behaviors,may,help,foster,clinically,meaningful,improvements

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