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1、Leppetal.InternationalJournalofBehavioralNutritionandPhysicalActivity2013,10:79http://www.ijbnpa.org/content/10/1/79RESEARCHOpenAccessTherelationshipbetweencellphoneuse,physicalandsedentaryactivity,andcardiorespiratoryfitnessinasampleofU.S.collegestudents1*1211AndrewLepp,JacobEBarkley,GabrielJSand
2、ers,MichaelReboldandPeterGatesAbstractBackground:Today’scellphonesincreaseopportunitiesforactivitiestraditionallydefinedassedentarybehaviors(e.g.,surfingtheinternet,playingvideogames).Peoplewhoparticipateinlargeamountsofsedentarybehaviors,relativetothosewhodonot,tendtobelessphysicallyactive,lessph
3、ysicallyfit,andatgreaterriskforhealthproblems.However,cellphoneusedoesnothavetobeasedentarybehaviorasthesedevicesareportable.Itcanoccurwhilestandingorduringmild-to-moderateintensityphysicalactivity.Thus,therelationshipbetweencellphoneuse,physicalandsedentaryactivity,andphysicalfitnessisunclear.The
4、purposeofthisstudywastoinvestigatetheserelationshipsamongasampleofhealthycollegestudents.Methods:Participantswerefirstinterviewedabouttheirphysicalactivitybehaviorandcellphoneuse.Thenbodycompositionwasassessedandthevalidatedself-efficacysurveyforexercisebehaviorscompleted.Thiswasfollowedbyaprogres
5、siveexercisetestonatreadmilltoexhaustion.Peakoxygenconsumption(VO2peak)duringexercisewasusedtomeasurecardiorespiratoryfitness.Hierarchicalregressionwasusedtoassesstherelationshipbetweencellphoneuseandcardiorespiratoryfitnessaftercontrollingforsex,self-efficacy,andpercentbodyfat.Interviewdatawastra
6、nscribed,coded,andChi-squareanalysiswasusedtocomparetheresponsesoflowandhighfrequencycellphoneusers.Results:Cellphoneusewassignificantly(p=0.047)andnegatively(β=−0.25)relatedtocardiorespiratoryfitnessindependentofsex,self-efficacy,andpercentfatwhichwerealsosignificantpredictors(p<0.05).Interviewda
7、taofferedseveralpossibleexplanationsforthisrelationship.First,highfrequencyusersweremorelikelythanlowfrequencyuserstoreportforgoingopportunitiesforphysicalactivityinordertousetheircellphonesforsedentarybehaviors.
