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dc.contributor.authorFinni Juutinen, Taija
dc.contributor.authorIkegawa, Shikegi
dc.contributor.authorKomi, Paavo
dc.date.accessioned2015-10-23T04:17:20Z
dc.date.available2015-10-23T04:17:20Z
dc.date.issued2001fi
dc.identifier.citationFinni Juutinen, T., Ikegawa, S., & Komi, P. (2001). Concentric force enhancement during human movement. <em>Acta Physiologica Scandinavica</em>, 173(4), 369-377. <a href="http://dx.doi.org/10.1046/j.1365-201X.2001.00915.x">doi:10.1046/j.1365-201X.2001.00915.x</a>fi
dc.identifier.otherTUTKAID_6682
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/47375
dc.description.abstractIn order to understand the possible mechanisms contributing to enhanced concentric performance in stretch-shortening cycle exercises in vivo the present study examined knee extension torque, EMG activity and fascicle length of the vastus lateralis muscle in maximal and submaximal human movements. Maximal concentric knee extensions (120 s-1) were done after pre-stretch and pre-isometric conditions by nine volunteers. During shortening at the knee angle of 115 (180 = extended) the knee extension torque was found to be greater in pre-stretch condition (272 vs. 248 Nm, p < 0.05) although the torque level prior to shortening was smaller than in pre-isometric condition (268 vs. 314 Nm, p< 0.05). At the moment of torque enhancement the EMG activity levels or fascicle lengths did not differ between the conditions. It is proposed that besides specific experimental conditions the present enhancement may be related to longer fascicle length prior to shortening (by 4.1 cm, p< 0.05) in pre-stretch condition and to modified length-tension properties. Fascicle length behaviour was found to play an important role also in unilateral, submaximal sledge-jump conditions where pre-loading was altered but the concentric net impulse and joint angular movements were the same. In repeated drop jumps with greater pre-load the changes in fascicle length were smaller than in the counter movement jump that was characterized by a lower force and activity level in the eccentric phase. Results from the present maximal and submaximal loading conditions suggest that the benefits of stretch-shortening cycle muscle function may come through different interactive mechanisms that may be task specific.fi
dc.language.isoeng
dc.publisherWiley
dc.relation.ispartofseriesActa Physiologica Scandinavica
dc.subject.otherfasciclefi
dc.subject.otherforce enhancementfi
dc.subject.otherforce-lengthfi
dc.subject.otherjumpingfi
dc.subject.otherknee extensionfi
dc.subject.othermuscle-tendon unitfi
dc.subject.otherpotentiationfi
dc.subject.otherstretch-shortening cyclefi
dc.titleConcentric force enhancement during human movementfi
dc.identifier.urnURN:NBN:fi:jyu-201510233460
dc.contributor.laitosLiikuntabiologian laitosfi
dc.contributor.laitosDepartment of Biology of Physical Activityen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2015-10-23T03:15:04Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange369-377
dc.relation.issn0001-6772
dc.relation.volume--
dc.type.versionacceptedVersion
dc.rights.copyright© Wiley. This is a final draft version of an article whose final and definitive form has been published by Wiley.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1046/j.1365-201X.2001.00915.x


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