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简介:基于大数据对大学生体质进行分类预测,有助于大学体育治理体系的建设,朴素贝叶斯模型是一种操作简单且性能较好的机器学习分类算法.基于朴素贝叶斯分类算法,采用广州商学院2014、2015年学生体测数据及其评分结果作为源数据,构建大学生体质分类器.应用此分类器可对大学生的体质状况实现一定概率意义上正确的判断,从而可以对体质存在隐患概率比较大的学生给出主动性预警,以便大学体育对学生进行群体性的体质判断、进行个性化的有效干预,从而促进学生健康发展,提高大学生整体体质水平.分类器模型用Python编码实现,最后用与训练数据不重叠的历史体质数据检测分类器的准确率,结果显示,基于朴素贝叶斯算法的体质分类器达到了78%的正确率.
简介:Purpose:Theaimofthisstudywastoinvestigatetheinfluenceofthecardiorespiratoryfitnesslevelontheresponsetohigh-intensityintervaltraining(HIIT)withanindividuallyadjustedrunningspeedofthesamerelativeintensity.Theevaluationfocusedonacutecardiorespiratoryresponse,postexercisecardiacautonomicmodulation(heartratevariability(HRV))andbiochemicalmarkersofinflammation,oxidativestress,andmuscledamage.Methods:Thirtyparticipantsweredividedinto3subgroups:welltrained,moderatelytrained,anduntrained.Alltheparticipantsperformed30minHIITcomposedof6×2minintervalexercisewithwork-to-reliefratio=1andworkintensity100%ofindividualvelocityatmaximaloxygenconsumption(VO2max).Acutecardiorespiratoryvariables,postexerciseHRV,lactate,interleukin-6(IL-6),totalantioxidantcapacity(TAC),creatinekinase,andmyoglobinupto4hafterHIITweremonitored.Results:Thedifferencesinrelativelyexpressedcardiorespiratoryvariables(heartrate,VO2)duringHIITwereatmostmoderate,withthemostpronouncedbetween-groupdifferencesinabsoluteVO2values.ThedisruptionofthepostexerciseHRVwasthemostpronouncedinuntrainedindividuals,andthisdifferencepersisted1hafterHIIT.ThehighestpostexerciseIL-6andTACconcentrationsandthelowestchangesincreatinekinaseandmyoglobinwererevealedinwell-trainedindividuals.Conclusion:Thehigherfitnesslevelwasassociatedwiththelesspronouncedpostexercisecardiacautonomicchangesandtheirfasterrestoration,evenwhenthereweresimilaracutecardiorespiratoryresponses.ThesefindingsweresimultaneouslyaccompaniedbythehigherpostexerciseIL-6andTACconcentrationsandlesssignificantchangesinmuscledamagebiochemicalmarkersinwell-trainedindividuals.
简介:一、变异技术在实战中,变异技术不同于基本技术,它看去不甚规范,似有“破绽”,但破绽是为了蒙骗对手,使对手产生错觉,而实施进攻技术,结果被我方有效防守或造成进攻落空,给我方以防守反击和反攻的机会和条件.不论是实战姿势、步法或基本技术等均可用变异的技术蒙骗对手.实战姿势的欺骗:左臂下落,将身体侧向暴露给对手;故意重心前移,给对手造成欲起右腿的假象;右臂后引给对手以欲出右拳的错觉;上身前倾给对手以适宜攻击的距离感等蒙骗技术,引诱对手进攻,再实施反攻、防守反击的战术意图.步法的欺骗:右脚后移而左脚滞留不后移,使对手误以为向后退,实际上是为向前滑步实施反攻;左腿故意向右后插步,似有退右步,远离对手的趋向,当对手进步时,则起左脚踹击.