Show simple item record

dc.contributor.authorWade, L
dc.contributor.authorLichtwark, G
dc.contributor.authorFarris, DJ
dc.date.accessioned2019-01-18T11:47:37Z
dc.date.issued2019-01-16
dc.description.abstractMuscle contractile mechanics induced by the changing demands of human movement have the potential to influence our movement strategies. This study examined fascicle length changes of the triceps surae during jumping with added mass or increasing jump height to determine whether the chosen movement strategies were associated with relevant changes in muscle contractile properties. Sixteen participants jumped at sub-maximal and maximal intensities while total net work was matched via two distinct paradigms: (1) adding mass to the participant or (2) increasing jump height. Electromyography (EMG) and ultrasound analyses were performed to examine muscle activation, fascicle length and fascicle velocity changes of the triceps surae during jumping. Integrated EMG was significantly higher in the added mass paradigm with no difference in mean or maximal EMG, indicating that the muscle was activated for a significantly longer period of time but not activated to a greater intensity. Fascicle shortening velocity was slower with added mass compared than with increasing jump height; therefore, intrinsic force–velocity properties probably enabled increased force production. Improved fascicle contractile mechanics paired with a longer activation period probably produced a consistently larger fascicle force, enabling a greater impulse about the ankle joint. This may explain why previous research found that participants used an ankle-centred strategy for work production in the added mass paradigm and not in the jump height paradigm. The varied architecture of muscles within the lower limb may influence which muscles we choose to employ for work production under different task constraints.en_GB
dc.description.sponsorshipAustralian Postgraduate Awarden_GB
dc.identifier.citationVol. 222, article jeb194852en_GB
dc.identifier.doi10.1242/jeb.194852
dc.identifier.urihttp://hdl.handle.net/10871/35524
dc.language.isoenen_GB
dc.publisherCompany of Biologistsen_GB
dc.rights.embargoreasonUnder embargo until 16 January 2020 in compliance with publisher policy
dc.rights© 2019. Published by The Company of Biologists Ltd. http://www.biologists.com/user-licence-1-1/en_GB
dc.titleThe influences of added mass on muscle activation and contractile mechanics during submaximal and maximal countermovement jumping in humansen_GB
dc.typeArticleen_GB
dc.date.available2019-01-18T11:47:37Z
dc.identifier.issn0022-0949
dc.descriptionThis is the final version. Available from the Company of Biologists via the DOI in this recorden_GB
dc.identifier.journalJournal of Experimental Biologyen_GB
dc.rights.urihttp://www.biologists.com/user-licence-1-1/en_GB
dcterms.dateAccepted2018-11-09
rioxxterms.versionVoRen_GB
rioxxterms.licenseref.startdate2019-01-16
rioxxterms.typeJournal Article/Reviewen_GB
refterms.dateFCD2019-01-17T18:11:16Z
refterms.versionFCDAM
refterms.panelCen_GB


Files in this item

This item appears in the following Collection(s)

Show simple item record