简介：就像是drose1和drose1.5一样,在drose2和drose2.5之间也拥有一段密不可分的完美传承。超轻质的SprintWeb材质鞋面在减轻球鞋重量的同时,为双脚提供足够的足部支撑,这样的新式轻质科技鞋面在adiZeroCrazyLight球鞋上首创,经过若干不同球鞋上的实验,在drose2.5上得到更精确的改进,让球鞋更加适合选择他的穿着者——德里克-罗斯。

简介：Background:Wearablemonitors（WMs）areusedtoestimatethetimespentinsedentarybehaviors（SBs）andlight-intensityphysicalactivities（LPAs）andtheirassociatedenergycost;however,theaccuracyofWMsinmeasuringbehaviorsonthelowerendoftheintensityspectrumisunclear.Theaimofthisstudywastoassessthevalidityof3WMs（ActiGraphGT3X+;activPAL,andSenseWear2）inestimatingtheintensityofSBandLPAinadultsascomparedwiththecriterionmeasureofoxygenuptake（VO2）measuredbyindirectcalorimetry.Methods:Sixteenparticipants（age:25.38±8.58years）woretheActiGraphGT3X+,activPAL,andSenseWear2devicesduring7sedentary-to-lightactivities.VO2（mL/kg/min）wasestimatedbymeansofaportablegasanalyzer,OxyconMobile（Carefusion,YorbaLinda,CA,USA）.Alldataweretransformedintometabolicequivalentsandanalyzedusingmeanpercentageerror,equivalenceplots,Bland-Altmanplots,kappastatistics,andsensitivity/specificity.Results:MeanpercentageerrorwaslowestfortheactivPALforSB（14.9%）andLPA（9.3%）comparedwithotherWMs,whichwere>21.2%.NoneoftheWMsfellwithintheequivalencyrangeof±10%ofthecriterionmeanvalue.Bland-AltmanplotsrevealednarrowerlevelsofagreementwithallWMsforSBthanforLPA.KappastatisticswerelowforallWMs,andsensitivityandspecificityvariedbyWMtype.Conclusion:NoneoftheWMstestedinthisstudywereequivalentwiththecriterionmeasure（VO2）inestimatingsedentary-to-lightactivities;however,theactivPALhadgreateroverallaccuracyinmeasuringSBandLPAthandidtheActiGraphandSenseWear2monitors.

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简介：Background:Identifyingfactorsassociatedwithphysicalactivity(PA)isusefulinplanninginterventionsandpolicies.Theaimofthisstudywastoidentifysociodemographic,biological,andpsychosocialfactorsassociatedwithPAperformedinschoolsettings.Methods:Datacollectedforthepresentstudyincludedgender,age,socioeconomicstatus,bodyfatpercentage,aerobicfitness,self-efficacy,attitudes,peerandparentalsupport,andperceptionofschoolenvironment.Dependentvariableswerelight-intensityPA(LPA)andmoderate-to-vigorousintensityPA(MVPA)performedduringschooltime,recesses,andphysicaleducation(PE)classes.Multipleregressionanalyseswereperformed.Results:Participatingadolescents(n=567,53%female,12.9±5.3years)spent5%ofschooltimeinMVPAand27%inLPA,15%ofrecessesinMVPAand44%inLPA,and16%ofPEclassesinMVPAand41%inLPA.BoysengagedinmoreMVPAinallcategories.AgewasinverselyrelatedwithMVPAandLPAinallperiods,whereasbodyfatpercentagewasinverselyrelatedwithMVPAinschooltimeandPEclasses.AttitudewasinverselyrelatedwithMVPAinallperiodsandwithLPAinrecesses.ConsideringPAtobegoodandenjoyablewaspositivelyassociatedwithMVPAinschooltime.Conclusion:AdolescentsspentlittletimeinPAduringschool.Futureinterventionsshouldimplementenjoyableactivitiesatschool.