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dc.contributor.authorKümmel, Jakob
dc.contributor.authorCronin, Neil
dc.contributor.authorKramer, Andreas
dc.contributor.authorAvela, Janne
dc.contributor.authorGruber, Markus
dc.date.accessioned2018-01-22T07:42:07Z
dc.date.available2018-04-06T21:45:09Z
dc.date.issued2018
dc.identifier.citationKümmel, J., Cronin, N., Kramer, A., Avela, J., & Gruber, M. (2018). Conditioning hops increase triceps surae muscle force and Achilles tendon strain energy in the stretch-shortening cycle. <em>Scandinavian Journal of Science and Medicine in Sports</em>, 28 (1), 126-137. <a href="https://doi.org/10.1111/sms.12870">doi:10.1111/sms.12870</a>
dc.identifier.otherTUTKAID_73182
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/56833
dc.description.abstractPostactivation potentiation can improve athletic performance, but the underlying mechanisms are poorly understood. This study investigated the effect of conditioning hops on triceps surae muscle force and tendon strain and its contribution to potentiated stretch-shortening cycle (SSC) performance. Thirty-two subjects participated in two experiments. In both experiments, subjects performed three drop jumps (DJs) after prior conditioning with 10 maximal hops, three unconditioned DJs served as control. Ground reaction forces, kinematics, and triceps surae electromyographic activity were recorded. Ultrasound imaging was used to determine fascicle lengths (FASC) of the gastrocnemius (GM) and soleus muscles (experiment 1) and the length of the Achilles tendon (experiment 2) during the DJs. DJ height after the conditioning hops was significantly higher compared to control DJs (experiment 1: +12% and experiment 2: +19%). A significantly shorter GM FASC during the DJs performed after the conditioning hops coincided with an increased force acting on the triceps surae muscle. Moreover, the triceps surae muscle-tendon unit (MTU) showed increased energy absorption during the eccentric phase of the DJs and increased energy release during the concentric phase. The second experiment revealed a higher Achilles tendon strain in DJs performed after the conditioning hops compared to control DJs. No significant differences in muscle activities were observed. The shorter FASC in GM and the larger Achilles tendon strain facilitated MTU energy transfer from the eccentric to the concentric phase during the DJ. Thereby, conditioning hops improved SSC efficacy and DJ performance.
dc.language.isoeng
dc.publisherJohn Wiley & Sons Ltd
dc.relation.ispartofseriesScandinavian Journal of Science and Medicine in Sports
dc.subject.otherconditioning activity
dc.subject.otherdrop jump
dc.subject.otherpost-activation potentiation
dc.subject.otherultrasound imaging
dc.titleConditioning hops increase triceps surae muscle force and Achilles tendon strain energy in the stretch-shortening cycle
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201801171244
dc.contributor.laitosLiikuntatieteellinen tiedekuntafi
dc.contributor.laitosFaculty of Sport and Health Sciencesen
dc.contributor.oppiaineBiomekaniikka
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2018-01-17T13:15:12Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.format.pagerange126-137
dc.relation.issn0905-7188
dc.relation.volume28
dc.type.versionacceptedVersion
dc.rights.copyright© 2017 John Wiley & Sons Ltd. This is a final draft version of an article whose final and definitive form has been published by John Wiley & Sons Ltd. Published in this repository with the kind permission of the publisher.
dc.rights.accesslevelopenAccessfi
dc.relation.doi10.1111/sms.12870


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