Näytä suppeat kuvailutiedot

dc.contributor.authorFinni, Taija
dc.date.accessioned2008-01-09T13:00:40Z
dc.date.available2008-01-09T13:00:40Z
dc.date.issued2001
dc.identifier.isbn951-39-1216-7
dc.identifier.otheroai:jykdok.linneanet.fi:874440
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/13521
dc.description.abstractYleensä lihasten toimintaa ihmisen liikkumisessa on tutkittu luonnollisissa liikkumistilanteissa vain mallintamisen keinoin, koska lihaspituuksien ja voimien suora mittaaminen on ollut joko teknisten tai eettisten syiden vuoksi vaikeaa. Taija Finnin väitöskirjatyössä on Jyväskylän yliopiston liikuntabiologian laitoksen Neuromuscular Research Center:ssä kehitetyn jännevoima-anturin ja ultraäänitekniikan avulla saatu seikkaperäistä tietoa siitä, miten lihasten ja jänteiden vuorovaikutus tapahtuu ihmisen liikkumisessa. Tutkimuksessa selvitettiin erityisesti voimantuottoa ja pituudenmuutoksia erilaisissa hyppelysuorituksissa mutta myös lihasten maksimaalista voimantuottokykyä.fi
dc.description.abstractThe present series of experiments utilized in vivo tendon force and fascicle length measurements for studying muscle mechanics during human locomotion. The behavior of quadriceps femoris and triceps surae muscle groups was examined in several different jumping exercises as well as during isokinetic knee and ankle extensions. In order to know how the muscle functions in natural locomotion as compared to its output during maximal constant velocity conditions, interaction between muscle and tendon lengths was studied. Special emphasis was given for understanding the benefits of pre-stretch in stretch-shortening cycle (SSC) of muscle function. The results suggest that there may be several interactive, task specific mechanisms that contribute to the enhanced performance in SSC exercises. Together with external loading conditions, the varying neural activity pattern sets the conditions for elastic energy storage and recoil by controlling the relative changes in muscle and tendon lengths. Greater activity level and force in a drop jump, for example, emphasize the role of elastic recoil from tendons as compared to a counter movement jump where also other mechanisms need to be acknowledged. Results from both submaximal jumps and maximal knee extensions suggest that enhancement may be related to length dependent behavior of muscle force. In addition to these mechanisms, contractile potentiation can have a role in SSC but may not be responsible for the major enhancement occurring in late concentric phase at high shortening velocities. Results from hopping with small knee-joint angular displacement suggest that there may be a particular frequency and jumping height at which the elastic bouncing is best utilized and at the same time the concentric phase is most economical. Results also support earlier observations that the economy of the shortening phase must be compromised at some point in order to produce more power and improve the jumping height.en
dc.format.extentTekstiä.
dc.language.isoeng
dc.publisherJyväskylän yliopisto
dc.relation.ispartofseriesStudies in sport, physical education and health
dc.relation.isversionofMyös painettuna.
dc.titleMuscle mechanics during human movement revealed by in vivo measurements of tendon force and muscle length
dc.typeDiss.
dc.identifier.urnURN:ISBN:951-39-1216-7
dc.type.dcmitypeTexten
dc.type.ontasotVäitöskirjafi
dc.type.ontasotDoctoral dissertationen
dc.contributor.tiedekuntaLiikuntatieteellinen tiedekuntafi
dc.contributor.tiedekuntaFaculty of Sport and Health Sciencesen
dc.contributor.yliopistoUniversity of Jyväskyläen
dc.contributor.yliopistoJyväskylän Yliopistofi
dc.contributor.oppiaineBiomekaniikkafi
dc.relation.issn0356-1070
dc.relation.numberinseries78
dc.rights.accesslevelopenAccessfi
dc.subject.ysolihakset
dc.subject.ysojänteet
dc.subject.ysovuorovaikutus
dc.subject.ysoliikkeet
dc.subject.ysoliikkuminen
dc.subject.ysobiomekaniikka
dc.subject.ysoihminen


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