简介：Background:Lately,physicalactivity(PA)inyounggirlshasbeenfrequentlydiscussed,thuswewereinterestedtoexaminewhetheramentaltraininginterventioncanincreasethelevelofPAinyounggirls.Methods:Asampleof56girlsaged15.4±0.3years(mean±SD)wasassignedtoeithertheinterventionorcontrolgroup.Wethenconducteda6-weekmentalimagerytrainingprogramonyoungfemaleparticipants.PAwasevaluatedwithobjectiveaccelerometermonitors.Physicalself-conceptwasalsoassessedinallparticipants.Results:Youngfemales'PAincreasedafteracourseofmentaltrainingcomparedtofemaleparticipantsincontrolgroup.Furthermore,physicalself-conceptimprovedrelatedtomentaltrainingprogram.Conclusion:ExerciseimagerymaybeaneffectivemethodofPAincreasebesidespsychologicalenhancementinyounggirls.

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简介：Background:Animpactofregularphysicalactivity(RPA)ontheabdominalmusclesmaybesignificantwhencomparingvarioussymptomaticgroups.However,thereislackcomprehensiveinformationinthisfield.Theobjectiveofthisstudywastoassessthelateralabdominalwallatrestandduringabdominaldrawing-inmanoeuvreinadolescentphysicallyactivegirlsindifferentbodypositions.Methods:Onehundredandforty-fourfemalestudents,13–17yearsofage,participatedinthestudy.Participantsweredividedinto2groupsbasedonaphysicalactivity(PA)statement.Measurementsofthethicknessoftheabdominalmusclesatrestandduringabdominaldrawing-inmanoeuvreweremadeinthesupineandstandingpositionsbyultrasoundimaging.Results:Comparedtothecontrolgroup,activitiesoftheobliquusinternusandtransversusabdominismuscleswerehigherintheregularPAgroupby8.9%(95%CI:3.1–14.7)and36%(95%CI:19.1–47.5),respectively.IntheRPAgroup,thetransversusabdominispreferentialactivationratiowasgreaterby0.03(95%CI:0.01–0.04),andthecontractionratiowasgreaterbyameanvalueof0.35(95%CI:0.18–0.46).Conclusion:RPAdoesnothaveanyeffectontherestingthicknessoftheabdominalmusclesinthesupineandstandingpositions.GirlsperformingRPAhaveagreaterabilitytoperformanindependentactivationandgreatercontractionsofthetransversusabdominis.

简介：Background:Giventhelowlevelsofphysicalactivity(PA)amongadolescentgirlsintheUS,thereisaneedtoidentifytoolstomotivateincreasedPA.AlthoughthereislimitedevidencethatadolescentstransferPAfromonecontexttoanother,exergames(i.e.,videogamesthatrequiregrossmotoractivity)mayactasagatewaytopromoteoverallPAoutsidegameplay.Thepurposeofthisstudywastoexaminepotentialtransfereffects(i.e.,influencesonexternalbehaviorsandpsychologicalconstructs)ofa12-weekexergaminginterventiononadolescentgirls’PA,screentime,andself-efficacytowardPA,aswellastheintrinsicmotivationofexergaming.Methods:Participantswere37girlsaged14–18years(65%AfricanAmerican,35%white)whowereoverweightorobese(bodymassindex≥85thpercentile)andwererecruitedfromthecommunityviaschool,physicians,newsmedia,andsocialmediawebsites.Adolescentswererandomlyassignedtoa12-weekgroupexergamingintervention(thirty-six60minsessionsofgroup-baseddanceexergaminginaresearchlaboratoryusingKinectforXbox360(MicrosoftCorporation,Redmond,WA,USA))ortoano-treatmentcontrolgroup.OutcomevariablesincludedobjectivelymeasuredPA(total)andself-reportedleisure-timePA(discretionarytimeonly)1weekbeforevs.1weekaftertheintervention;selectedtypeandintensityofPAwhenplacedinagymsettingfor30min('cardiofreechoice');screentime;self-efficacytowardPA;andintrinsicmotivationtowardexergaming.Results:Attendanceattheexergamingsessionswashigh(80%).Comparedwiththecontrolgroup,theinterventiongroupself-reportedanincreaseinPA(p=0.035)andfewerhourswatchingtelevisionorvideos(p=0.01)aftertheintervention,buttherewerenosignificantdifferencesinsedentary,light,moderate,orvigorousPAmeasuredbyaccelerometry.Theinterventiongroupsignificantlyimprovedself-efficacytowardPA(p=0.028).Theinterventiongrouphighlyratedintrinsicmotivationtowardexergaming.Conclusi

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