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开链运动与闭链运动.pptx

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开链运动与闭链运动运动链Inopenkineticchain(OKC)exercise,theterminalsegmentoftheextremitymovesfreelywithoutanyexternalresistance、ThesequentialactivationofmusclesinOKCexercisefromproximaltodistalallowsrapidaccelerationandspeedofthedistalsegment、Inclosedkineticchain(CKC)exercise,thedistalsegmentoftheextremityisfixed,andproximalmotion takesplaceinmultipleplanes、 Amonerrorindevelopinganexerciseprogramisfailuretoassesstheproximalanddistalsegmentsoftheentireextremity,orkineticchain、Akinematicchainisaseriesofinterrelatedjointsthatconstituteaplexmotorunit,constructedsothatmotionatonejointwillproducemotionattheotherjointsinapredictablemanner、Whereaskinematicsdescribestheappearanceofmotion,kineticsinvolvestheforces,whetherinternal(e、g、,musclecontractionsorconnectivetissuerestraints)orexternal(e、g、,gravity,inertia,orsegmentalmasses)thataffectmotion、Initially,aclosedkineticchain(CKC)wascharacterizedasthedistalsegmentoftheextremityinanerect,weight-bearingposition,suchasthelowerextremitywhenapersonisweightbearing、Subsequently,whenthedistalsegmentoftheextremityisfreetomovewithoutcausingmotionatanotherjoint,suchaswhennon-weightbearing,thesystemwasreferredtoasanopenkineticchain(OKC)、Whenforceisapplied,thedistalsegmentmayfunctionindependentlyorinunisonwiththeotherjoints、MovementsofthemoreproximaljointsareaffectedbyOKCandCKCpositions、Forexample,therotationalponentsoftheankle,knee,andhipreversedirectionwhenmovingfromanOKCtoCKCposition、 Becauseofincongruitiesbetweenthelowerandupperextremity,particularlyintheshoulderregion,severalauthorshavechallengedthetraditionaldefinitionofOKCandCKCpositions、StabilizingmusclesinthescapulothoracicregionproducesajointpressionforcethatstabilizestheglenohumeraljointmuchinthesamemannerasaCKCinthelowerextremity、AlthoughdebatecontinuesondefiningCKCandOKCrelativetotheupperextremity,thereremainsgeneralagreementthatbothCKCandOKCexercisesshouldbeincorporatedintoanupperandlowerextremityrehabilitationprogram、 Injuryandsubsequentimmobilizationcanaffecttheproprioceptorsinthes