Show simple item record

dc.contributor.authorFinni Juutinen, Taija
dc.contributor.authorKomi, Paavo
dc.contributor.authorLepola, Vesa
dc.date.accessioned2015-10-23T03:53:01Z
dc.date.available2015-10-23T03:53:01Z
dc.date.issued2001
dc.identifier.citationFinni Juutinen, T., Komi, P., & Lepola, V. (2001). In vivo muscle mechanics during normal locomotion is dependent on movement amplitude and contraction intensity. <i>Eur J Appl Physiol</i>, <i>85</i>, 170-176.
dc.identifier.otherCONVID_18416403
dc.identifier.otherTUTKAID_3388
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/47374
dc.description.abstractThe effects of movement amplitude and contraction intensity on triceps surae and quadriceps femoris muscle function were studied during repetitive hopping. In vivo forces from Achilles and patellar tendons were recorded with the optic fibre technique from eight volunteers. The performances were filmed (200 Hz) to determine changes in muscle-tendon unit length and velocity. When hopping with a small amplitude (23° knee flexion during the ground contact phase), the Achilles tendon was primarily loaded whereas patellar tendon forces were greater in large-amplitude hopping (56° knee flexion). In spite of the different magnitudes of stretch in the quadriceps femoris muscle, the stretching velocity and activity patterns of the quadriceps muscle were similar in both conditions. Simultaneously performed electromyographic (EMG) recordings revealed that preferential preactivation of the gastrocnemius muscle was evident in both jumping conditions. The triceps surae muscle was strongly active in the eccentric phase of small-amplitude hopping. Results from hopping with small knee-joint 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.fi
dc.language.isoeng
dc.publisherSpringer-Verlag
dc.relation.ispartofseriesEur J Appl Physiol
dc.relation.urihttp://link.springer.com/journal/421
dc.subject.othereconomy
dc.subject.otherhopping
dc.subject.othermuscle activiry
dc.subject.otheroptic fibre
dc.subject.othertendon force
dc.titleIn vivo muscle mechanics during normal locomotion is dependent on movement amplitude and contraction intensity
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201510233462
dc.contributor.laitosLiikuntabiologian laitosfi
dc.contributor.laitosDepartment of Biology of Physical Activityen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2015-10-23T03:15:12Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange170-176
dc.relation.issn1439-6319
dc.relation.numberinseries--
dc.relation.volume85
dc.type.versionacceptedVersion
dc.rights.copyright© Springer. This is a final draft version of an article whose final and definitive form has been published by Springer.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1007/s004210100438


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record