Show simple item record

dc.contributor.authorHoffrén, Merja
dc.contributor.authorIshikawa, Masaki
dc.contributor.authorRantalainen, Timo
dc.contributor.authorAvela, Janne
dc.contributor.authorKomi, Paavo
dc.date.accessioned2016-08-26T07:10:36Z
dc.date.available2016-08-26T07:10:36Z
dc.date.issued2011
dc.identifier.citationHoffrén, M., Ishikawa, M., Rantalainen, T., Avela, J., & Komi, P. (2011). Age-related muscle activation profiles and joint stiffness regulation in repetitive hopping. Journal of Electromyography and Kinesiology, 21 (3), 483-491. doi:10.1016/j.jelekin.2011.01.009
dc.identifier.otherCONVID_20723181
dc.identifier.otherTUTKAID_46832
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/51071
dc.description.abstractIt is well documented that increasing effort during exercise is characterized by an increase in electromyographic activity of the relevant muscles. How aging influences this relationship is a matter of great interest. In the present study, nine young and 24 elderly subjects did repetitive hopping with maximal effort as well as with 50%, 65%, 75% and 90% intensities. During hopping joint kinematics were measured together with electromyographic activity (EMG) from the soleus, gastrocnemius medialis, gastrocnemius lateralis and tibialis anterior muscles. The results showed that agonist activation increased in both age groups with increasing intensity. The highest jumping efficiency (EMG ratio of the braking phase to the push off–phase activation) was achieved with moderate hopping intensities (65–75%) in both the young and in the elderly. Age-comparison showed that elderly subjects had high agonist preactivation but thereafter lower activation during the braking phase. Antagonist coactivation was minimal and did not show age- or intensity-specificity. The elderly had more flexed knees at the instant of ground contact. When intensity increased, the elderly also plantarflexed their ankles more before ground contact. Ankle joint stiffness was lower in elderly subjects only in high hopping intensities (90% and Max). These results confirm that age-specific agonist muscle activation profiles exist during hopping even when exercise intensities are matched on the relative scale. The results suggest further that the elderly can adjust their reduced neuromuscular capacity to match the demands set by different exercise intensities.
dc.languageeng
dc.language.isoeng
dc.publisherElsevier Science
dc.relation.ispartofseriesJournal of Electromyography and Kinesiology
dc.subject.otherneuraalinen ohjaus
dc.subject.otherniveljäykkyys
dc.subject.otherAging
dc.subject.otherStretch-shortening cycle
dc.subject.otherNeural control
dc.subject.otherStiffness control
dc.titleAge-related muscle activation profiles and joint stiffness regulation in repetitive hopping
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201608243860
dc.contributor.laitosLiikuntabiologian laitosfi
dc.contributor.laitosTerveystieteiden laitosfi
dc.contributor.laitosDepartment of Biology of Physical Activityen
dc.contributor.laitosDepartment of Health Sciencesen
dc.contributor.oppiaineBiomekaniikkafi
dc.contributor.oppiaineBiomechanicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2016-08-24T12:15:03Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange483-491
dc.relation.issn1050-6411
dc.relation.numberinseries3
dc.relation.volume21
dc.type.versionacceptedVersion
dc.rights.copyright© 2011 Elsevier Ltd
dc.rights.accesslevelopenAccessfi
dc.subject.ysoikääntyminen
jyx.subject.urihttp://www.yso.fi/onto/yso/p5056
dc.relation.doi10.1016/j.jelekin.2011.01.009


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record