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简介:Experimentalinvestigationintoimpact-resistantbehaviorofreactivepowderconcrete(RPC)-filledsteeltubularcolumnswasconducted,anddynamicresponseofthecolumnsunderaxialimpactloadingwasstudiedbymeansofnumericalsimulationmethod.IncreasecoefficientofloadcarryingcapacityandratioofloadcarryingcapacitybetweensteeltubeandRPCcoreofcol-umnswereobtained.
简介:Objective:Thissystematicreviewaimedtocriticallyanalyzetheliteraturetodeterminehowhigh-intensityintermittenttraining(HIIT)affectsrecreationalendurancerunnersintheshort-andlong-term.Methods:ElectronicdatabasesweresearchedforliteraturedatingfromJanuary2000toOctober2015.Thesearchwasconductedusingthekeywords'high-intensityintermittenttraining'or'high-intensityintervalexercise'or'intervalrunning'or'sprintintervaltraining'and'endurancerunners'or'longdistancerunners'.Asystematicapproachwasusedtoevaluatethe783articlesidentifiedforinitialreview.StudieswereincludediftheyinvestigatedHIITinrecreationalendurancerunners.ThemethodologicalqualityofthestudieswasevaluatedusingthePhysiotherapyEvidenceDatabase(PEDro)scale(forinterventionstudies)andthemodifiedDownsandBlackQualityIndex(forcross-sectionalstudies).Results:Twenty-threestudiesmettheinclusionarycriteriaforreview.Theresultsarepresentedin2parts:cross-sectional(n=15)andinterventionstudies(n=8).Inthe15cross-sectionalstudiesselected,endurancerunnersperformedatleast1HIITprotocol,andtheacuteimpactonphysiological,neuromuscular,metabolicand/orbiomechanicalvariableswasassessed.Interventionstudieslastedaminimumof4weeks,with10weeksbeingthelongestinterventionperiod,andincluded2to4HIITsessionsperweek.MostofthesestudiescombinedHIITsessionswithcontinuousrun(CR)sessions;2studies’subjectsperformedHIITexclusively.Conclusion:HIIT-basedrunningplans(2to3HIITsessionsperweek,combiningHIITandCRruns)showathleticperformanceimprovementsinendurancerunnersbyimprovingmaximaloxygenuptakeandrunningeconomyalongwithmuscularandmetabolicadaptations.Tomaximizetheadaptationstotraining,bothHIITandCRmustbepartoftrainingprogramsforendurancerunners.
简介:摘要:为了探讨呼吸肌训练对自行车运动员呼吸功能及运动能力的影响,对 10 名现役男子自行车运动员进行了四周的呼吸肌训练,并于每周进行高温高湿环境下最大摄氧量( VO 2 max )、每分通气量( VE )、呼吸频率( RR )和运动潮气量( Vt )反应有氧能力、呼吸功能的指标以及主观疲劳程度( RPE )和最大功率数据的采集。结果显示呼吸肌训练可以提高自行车运动员在高温高湿环境下的 VO 2 max 和最大运动功率,其中 VO 2 max 在呼吸肌训练 2 周后和 4 周后均较训练前提高了约 16.1% ,最大运动功率在呼吸肌训练 4 周后提升了 30W ,提升幅度为 11.1% ;此外呼吸肌训练可以有效提高平均每分通气量( VE )与运动时潮气量( Vt ), VE 和 Vt 在呼吸肌训练 4 周后高温高湿环境下较训练前分别升高约 19.5% 和 12.5% ,训练对高温高湿环境运动的肺通气功能有明显促进作用。建议自行车等有氧耐力性运动项目可以尝试练习呼吸肌群,从而帮助提升高温高湿环境下的有氧运动能力。
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简介:【内容摘要】 本文是在激发学生的兴趣,减轻学生负担的前提下,针对传统的听写的内容和形式令人堪忧的现状,根据新课程标准的要求,潜心改革,大胆尝试LRW式英语听写新范式,通过对LRW式听写的前期准备,LRW式听写的中期实听的策略研究以及LRW式听写的后期反馈的策略研究,充分的训练学生的听、说、读、写能力,进而提升学生的综合语言运用能力,发挥它最大的价值,为我们的英语教学服务。
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:[ 摘要 ] 为适应当今教育发展的要求,顺应教育改革,以 《初中英语学科“六个一”工程实施方案》为指导,我 经过长期的摸索实践,逐渐形成了一套简单实用的英语教学方法,把枯燥难学的英语变成了趣味横生的开心课,实现了学生乐学,教师乐教的课堂生态,最大程度上激发了学生学习英语的兴趣,真正提高了学生的听、说、读、写综合能力,为学生的终身学习和综合素质的发展奠定了基础。