学科分类
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2 个结果
  • 简介:Gaitrecognitionisthekeyquestionoffunctionalelectricalstimulation(FES)systemcontrolforparaplegicwalking.Anewrisk-tendency-graph(RTG)methodwasproposedtorecognizethestabilityinformationinFES-assistedwalkinggait.Themaininstrumentwasaspecializedwalkerdynamometersystembasedonamulti-channelstrain-gaugebridgenetworkfixedonthewalkerframe.Duringwalkingprocess,thissystemcollectedthereactionforcesbetweenpatient'supperextremitiesandwalkerandconvertedthemintoRTGmorphologiccurvesofdynamicgaitstabilityintemporalandspatialdomains.TodemonstratethepotentialusefulnessofRTG,preliminaryclinicaltrialsweredonewithparaplegicpatients.Thegaitstabilitylevelsoftwowalkingcaseswith4-and12-weekFEStrainingfromonesubjectwerequantified(0.43and0.19)fromtheresultsoftemporalandspatialRTG.Relevantinstablephasesingaitcycleanddangerousinclinationsofpatient'sbodyduringwalkingprocesswerealsobroughtforward.Inconclusion,thenewRTGmethodispracticalfordistinguishingmoreusefulgaitstabilityinformationforFESsystemcontrol.

  • 标签: 行走稳定性 步态识别方法 功能性电刺激系统 控制 截瘫患者
  • 简介:Theeffectsofexerciseondecision-makingperformancehavebeenstudiedusingawidevarietyofcognitivetasksandexerciseinterventions.Althoughthecurrentliteraturesupportsabeneficialinfluenceofacuteexerciseoncognitiveperformance,themechanismsunderlyingthisphenomenonhavenotyetbeenelucidated.Wereviewstudiesthatusedsingle-pulsetranscranialmagneticstimulation(TMS)toprobetheexcitabilityofmotorstructuresduringwhole-bodyexerciseandpresentaframeworktoaccountforthefacilitatingeffectsofacuteexerciseonmotorprocesses.Recentresultssuggestthat,evenintheabsenceoffatigue,theincreaseincorticospinalexcitabilityclassicallyreportedduringsubmaximalandexhaustingexercisesmaybeaccompaniedbyareductioninintracorticalinhibition.Weproposethatreducedintracorticalinhibitionelicitsanadaptivecentralmechanismthatcounteractstheprogressivereductioninmuscleresponsivenesscausedbyperipheralfatigue.Suchareductionwouldrenderthemotorcortexmoresensitivetoupstreaminfluences,thuscausingincreasedcorticospinalexcitability.Furthermore,reductionofintracorticalinhibitionmayaccountforthemoreefficientdescendingdriveandfortheimprovementofreactiontimeperformanceduringexercise.Theadaptivemodulationinintracorticalinhibitioncouldbeimplementedthroughageneralincreaseinreticularactivationthatwouldfurtheraccountforenhancedsensorysensitivity.

  • 标签: 运动皮层 经颅磁刺激 运动过程 兴奋性 急性 框架