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简介：<正>Background:Increasingcaloricexpenditureinphysicaleducationisconsideredaneffectiveschool-basedapproachtoaddressingthechildobesityepidemic.Thisstudywasdesignedtodeterminesynergisticinfluencesofstudentcharacteristicsandlessonfactorsoncaloricexpenditureinelementaryandmiddleschoolphysicaleducation.Methods:Thestudyusedamulti-leveldesign.Level-1factorsincludedpersonalcharacteristics:age,gender,andbodymassindex.Level-2factorsincludedlessonlength,content,andschoollevel.BasedontheCenterforDiseaseControlandPreventionage—genderadjustedgrowthchart,studentsin87classesfrom14elementaryand15middleschoolswerepre-screenedinto"Overweight","Healthyweight",or"Thin"groups.Oneboyandonegirlwererandomlyselectedfromeachgroupineachclassasdataproviders(264elementaryand294middleschoolstudents).Caloricexpenditurewasmeasuredin243physicaleducationlessonsusingaccelerometers.Results:Analysisofvariancerevealedandhierarchicallinearmodelingconfirmedseparateagebybodymassindex,agebygender,andcontentbylesson—lengthinteractioneffects,suggestingthatthepersonalandlessonfactorsinfluencedcaloricexpenditureindependently.Oldermaleandheavierstudentsburnedmorecaloriesinalllessons.Studentsburnedmorecaloriesin45—60minsportskillorfitnesslessonsthaninshorter(30min)orlonger(75—90min)gameormulti-activitylessons.Conclusions:Thehypothesizedcross-levelinteractionwasnotobservedinthedata.Caloricexpenditurecanbeoptimizedin45—60minsportskillorfitnessdevelopmentlessons.Itcanberecommendedthatschoolsadopt45—60minlessonlengthandprovideskillandfitnessdevelopmenttasksinphysicaleducationtomaximizecaloricexpenditure.

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简介：<正>Thebeneficialeffectsofappropriatephysicalactivity(PA),physicalfitness,anddietduringadultlifearewell-documentedbutthepotentialofappropriatePA,physicalfitness,anddiettoconferbenefitsonhealthandwell-beingduringchildhoodandadolescencehasnotbeenexploredfully.Recognizingthevalueofcriticalreviewsoftheextantliteratureinprovidingafoundationforfutureresearch,theJournalofSportandHealthScience(JSHS)hascommissionedtwoSpecialIssuesdevoted

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简介：今天是新学期的第一天，但是老师并不快乐，因为她的学生忘了带铅笔、钢笔……快来一起唱这首“开学歌”吧!

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简介：真实波浪是multidirectional波浪。在现在的学习，为为产生multidirectional的开车信号挥动的波浪制造者的计算方法在物理波浪盆组织被建议。它的有效性被事件边界条件被建议方法的使用为决定的一个数字模型首先证实。然后，multidirectional波浪组的物理模拟在实验室波浪盆被执行。multidirectional飘动与的试验性的结果表演期望波浪groupiness，它包括不仅它的组高度而且它的组长度，能令人满意地在物理波浪盆在指定位置被产生。

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简介：CentreforDialogueatMelbourne’sLaTrobeUniversityThepartyvisitedtheCentreforDialogueofLaTrobeUniversityonthemorningofSeptember26.TheUniversityhasdevelopeddeeprelationshipswithChineseuniversitiesandisthehomeschoolofLapolaRandi,thefirstChangjiangScholartobehiredbytheMinzuUniversityofChinainBeijing.

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