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1、全球三分之一青少年缺乏运动Americanchildrenaren'ttheonlycouchpotatoeswithnearlyonethirdofchildrengloballyspendingthreehoursadayormorewatchingTVoroncomputers,accordingtostudyofover70,000teensin34nations.FromArgentinatoZambia,ReginaGutholdoftheWorldHealthOrganizationinGenevaandhercolleaguesfoundmostchildrenaren'tge
2、ttingenoughexerciseanditmadenodifferenceiftheylivedinarichorapoorcountry."Withregardstophysicalactivitylevels,wedidnotfindmuchofadifferencebetweenpoorandrichcountries,"Gutholdsaid."Growingupinapoorcountrydoesnotnecessarilymeanthatkidsgetmorephysicalactivity."Thestudy,publishedinTheJournalofPediatric
3、s,lookingat72,845schoolchildrenaged13to15fromNorthandSouthAmerica,Asia,Europe,andtheMiddleEast.Thechildrenweresurveyedbetween2003and2007.Theresearchersdefinedadequatephysicalactivityasatleastanhourofexerciseoutsideofgymclassatleastfivedaysaweek.ChildrenwhospentthreeormorehoursadaywatchingTV,playingc
4、omputergames,orchattingwithfriends--asidefromtimeinschoolortimespentdoinghomework--wereclassifiedassedentary.Theresearchersfoundonlyonequarteroftheboysand15percentofthegirlsweregettingenoughexercisebythesedefinitions.Aquarterofboysandnearly30percentofgirlsweresedentaryanddidn'tgetenoughexercisewithg
5、irlslessactivethanboysineverycountryasidefromZambia.Uruguayhadthehighestpercentageofactiveboys,at42percent,whileZambiahadthelowest,at8percent.GirlsfromIndiawerethemostactive,with37percentmeetingexerciserecommendations,whilegirlsfromEgyptweretheleastactive,withjust4percentgettingadequateexercise.Chil
6、dreninMyanmarweretheleastsedentary,with13percentofboysand8percentofgirlsclassifiedassedentary.ThemostsedentarynationswereSt.LuciaandtheCaymanIslands,with58percentofboysand64percentofgirlsspendingatleastthreehoursadayinsedentaryactivities.Whilethestudydidn'tlookatthereasonsbehindthelackofphysicalacti
7、vityinvariousnations,GutholdspeculatedthaturbanizationcouldbeafactoraswellasaccesstocarsandTVs.一项面向34个国家7万多名青少年开展的调查显示，爱泡在电视机前的并非只有美国儿童，全球近三分之一的儿童每天看电视或玩电脑的时间达到三小时甚至更多。位于日内瓦的世界卫生组织的瑞吉娜•古特尔德和她的同事发现，从阿根
