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dc.contributor.authorWerkhausen, A
dc.contributor.authorCronin, NJ
dc.contributor.authorAlbracht, K
dc.contributor.authorBojsen-Møller, J
dc.contributor.authorSeynnes, OR
dc.date.accessioned2020-01-24T05:34:28Z
dc.date.available2020-01-24T05:34:28Z
dc.date.issued2019
dc.identifier.issn8750-7587
dc.identifier.doi10.1152/japplphysiol.00710.2018
dc.identifier.urihttp://hdl.handle.net/10072/390887
dc.description.abstractThe interaction between the Achilles tendon and the triceps surae muscles seems to be modulated differently with various task configurations. Here we tested the hypothesis that the increased forces and ankle joint work during running under contrasting conditions (altered speed or load) would be met by different, time-dependent adjustments at the muscle-tendon level. Ultrasonography, electromyography, kinematics, and ground reaction force measurements were used to examine Achilles tendon, gastrocnemius, and soleus muscle mechanics in 16 runners in four different running conditions, consisting of a combination of two different speeds (preferred and +20% of preferred speed) and two loading conditions (unloaded and +20% of body mass). Positive ankle joint work increased similarly (+13%) with speed and load. Gastrocnemius and soleus muscle fascicle length and peak velocity were not altered by either condition, suggesting that contractile conditions are mostly preserved despite the constraints imposed in this experimental design. However, at higher running speed, tendon length changes were unaltered but mean muscle electromyographic activity increased in gastrocnemius (+10%, P < 0.01) and soleus (+14%, P < 0.01). Conversely, when loading was increased, mean muscle activity remained similar to unloaded conditions but the mean velocity of gastrocnemius fascicles was reduced and tendon recoil increased (+29%, P < 0.01). Collectively, these results suggest that the neuromuscular system meets increased mechanical demands by favoring economical force production when enough time is available. NEW & NOTEWORTHY We demonstrate that muscle-tendon mechanics are adjusted differently when running under constraints imposed by speed or load, despite comparable increases in work. The neuromuscular system likely modulates the way force is produced as a function of availability of time and potential energy.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physiological Society
dc.relation.ispartofpagefrom246
dc.relation.ispartofpageto253
dc.relation.ispartofissue1
dc.relation.ispartofjournalJournal of Applied Physiology
dc.relation.ispartofvolume127
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchcode31
dc.subject.fieldofresearchcode32
dc.subject.keywordsAchilles tendon
dc.subject.keywordsload carriage
dc.subject.keywordslocomotion
dc.subject.keywordsmuscle architecture
dc.subject.keywordsrunning
dc.titleDistinct muscle-tendon interaction during running at different speeds and in different loading conditions
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationWerkhausen, A; Cronin, NJ; Albracht, K; Bojsen-Møller, J; Seynnes, OR, Distinct muscle-tendon interaction during running at different speeds and in different loading conditions, Journal of Applied Physiology, 2019, 127 (1), pp. 246-253
dc.date.updated2020-01-24T05:32:00Z
gro.hasfulltextNo Full Text
gro.griffith.authorCronin, Neil


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