简介：

简介：Background:Novelplayertrackingtechnologiescanchangetheunderstandingofperformancedeterminantsinteamsportsbyallowingtoaccuratelymeasuringtheactivitydemands.Theaimofthisstudywastoidentifyhowthedefensivepressureaffectsthetime-motionvariablesandthetechnicalactionsinbasketball.Methods:Twentyinternationalmaleplayers(age:16.05±2.09years,weight:73.13±8.10kg,height:183.10±5.88cm)playedtwo10minbasketballquarters,wheretheyusedaman-to-man1/4-courtdefenseuntilthe4thmin(F1/4),changedtoman-to-manfullcourt(FULL)for3minand,fromthe7thtothe10thminreturnedto1/4-courtdefense(S1/4).AcomputerizednotationalanalysiswasperformedusingSimiScoutandpositionaldatawerecapturedwiththeUbisenseRealTimeLocationSystem(meansamplingrate3.74±0.45Hzpertransmitter/player).Results:Thetime-motionvariablespresentedsimilarresultsbetweendefensiveconditions,showingatotaldistancecoveredaround90m/min.However,resultssuggestedpossibleverticaljumpimpairmentsinS1/4periods.Therewasmoredistancecoveredwhilejoggingintheoffensivecourt(38.15±12.17m/minoffensivecourtvs.32.94±10.84m/mindefensivecourt,p<0.05)andmoredistancecoveredwhilerunninginthedefensivecourt(16.41±10.27m/minoffensivecourtvs.19.56±10.29m/mindefensivecourt,p<0.05).Conclusion:Theseresultssuggesthowtoimprovetaskrepresentativenessduringspecificconditioningorgame-basedtrainingsituationsandalsotohelpcoaches’strategicdecisionsduringthegames.

简介：Background:Thegreatertrochantermarkeriscommonlyusedin3-dimensional(3D)models;however,itsinfluenceonhipandkneekinematicsduringgaitisunclear.Understandingtheinfluenceofthegreatertrochantermarkerisimportantwhenquantifyingfrontalandtransverseplanehipandkneekinematics,parameterswhichareparticularlyrelevanttoinvestigateinindividualswithconditionssuchaspatellofemoralpain,kneeosteoarthritis,anteriorcruciateligament(ACL)injury,andhippain.Theaimofthisstudywastoevaluatetheeffectofincludingthegreatertrochanterintheconstructionofthethighsegmentonhipandkneekinematicsduringgait.Methods:3Dkinematicswerecollectedin19healthysubjectsduringwalkingusingasurfacemarkersystem.Hipandkneeangleswerecomparedacrosstwothighsegmentdefinitions(withandwithoutgreatertrochanter)attwotimepointsduringstance:peakkneeflexion(PKF)andminimumkneeflexion(MinKF).Results:Hipandkneeanglesdifferedinmagnitudeanddirectioninthetransverseplaneatbothtimepoints.Inthethighmodelwiththegreatertrochanterthehipwasmoreexternallyrotatedthaninthethighmodelwithoutthegreatertrochanter(PKF:-9.34°±5.21°vs.1.40°±5.22°,MinKF:-5.68°±4.24°vs.5.01°±4.86°;p<0.001).Inthethighmodelwiththegreatertrochanter,thekneeanglewasmoreinternallyrotatedcomparedtothekneeanglecalculatedusingthethighdefinitionwithoutthegreatertrochanter(PKF:14.67°±6.78°vs.4.33°±4.18°,MinKF:10.54°±6.71°vs.-0.01°±2.69°;p<0.001).Smallbutsignificantdifferencesweredetectedinthesagittalandfrontalplaneanglesatbothtimepoints(p<0.001).Conclusion:Hipandkneekinematicsdifferedacrossdifferentsegmentdefinitionsincludingorexcludingthegreatertrochantermarker,especiallyinthetransverseplane.Thereforewhenconsideringwhethertoincludethegreatertrochanterinthethighsegmentmodelwhenusingasurfacemarkerstocalculate3Dkinematicsformovementassessment,iti