Background:The coronavirus disease-2019(COVID-19)pandemic and national lockdowns took away opportunities for children to be physically active.This study aimed to determine the effect of the COVID-19 lockdown on accelerometer-assessed physical activity(PA)in children in Wales.Methods:Eight hundred participants(8-18 years old),stratified by sex,age,and socio-economic status,wore Axivity AX3 accelerometers for 7 days in February 2021,during the lockdown,and in May 2021,while in school.Raw accelerometer data were processed in R-package GGIR,and cut-point data,average acceleration(AvAcc),intensity gradient,and the acceleration above which the most active X minutes are accumu-lated(MX)metrics were extracted.Linear mixed models were used to assess the influence of time-point,sex,age,and socioeconomic status(SES)on PA.Results:During lockdown,moderate-to-vigorous PA was 38.4±24.3 min/day;sedentary time was 849.4±196.6 min/day;mean±SD.PA levels increased significantly upon return to school(all variables p＜0.001).While there were no sex differences during lockdown(p=0.233),girls engaged in significantly less moderate-to-vigorous PA than boys once back in school(p＜0.001).Furthermore,boys had more favorable intensity profiles than girls(intensity gradient:p＜0.001),regardless of time-point.PA levels decreased with age at both time-points;upper sec-ondary school girls were the least active group,with an average M30 of 195.2 mg(while in school).Conclusion:The lockdown affected boys more than girls,as reflected by the disappearance of the typical sex difference in PA levels during lockdown,although these were re-established on return to school.Upper secondary school(especially girls)might need specific COVID-recovery intervention.

Liezel Hurter;Melitta McNarry;Gareth Stratton;Kelly Mackintosh

Applied Sports,Technology,Exercise and Medicine Research Centre(A-STEM),Swansea University,Swansea SA18EN,UK

运动与健康科学（英文）

[1]Liezel Hurter;Melitta McNarry;Gareth Stratton;Kelly Mackintosh-.Back to school after lockdown:The effect of COVID-19 restrictions on children's device-based physical activity metrics)[J].运动与健康科学（英文）,2022(04):530-536

wore,Axivity,GGIR,AvAcc

school,after,effect,restrictions,children,device,activity,metrics,Background,coronavirus,disease,pandemic,national,lockdowns,took,away,opportunities,be,physically,active,This,study,aimed,determine,assessed,PA,Wales,Methods,Eight,hundred,participants,years,old,stratified,by,sex,status,AX3,accelerometers,days,February,during,May,while,Raw,data,were,processed,package,cut,average,acceleration,intensity,gradient,above,which,most,minutes,are,accumu,lated,MX,extracted,Linear,mixed,models,used,influence,socioeconomic,SES,Results,During,moderate,vigorous,was,sedentary,mean,levels,increased,significantly,upon,return,variables,While,there,differences,girls,engaged,than,boys,once,back,Furthermore,had,favorable,profiles,regardless,decreased,both,points,upper,least,group,M30,Conclusion,affected,reflected,disappearance,typical,although,these,established,Upper,secondary,especially,might,need,specific,recovery,intervention

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