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dc.contributor.authorCronin, Neil J
dc.contributor.authorPeltonen, Jussi
dc.contributor.authorSinkjaer, Thomas
dc.contributor.authorAvela, Janne
dc.date.accessioned2017-05-03T15:50:15Z
dc.date.available2017-05-03T15:50:15Z
dc.date.issued2011
dc.date.modified2011-08-19T06:45:40Z
dc.identifier.issn0022-3077
dc.identifier.doi10.1152/jn.00967.2010
dc.identifier.urihttp://hdl.handle.net/10072/40165
dc.description.abstractDuring human walking, muscle activation strategies are approximately constant across consecutive steps over a short time, but it is unknown whether they are maintained over a longer duration. Prolonged walking may increase tendinous tissue (TT) compliance, which can influence neural activation, but the neural responses of individual muscles have not been investigated. This study investigated the hypothesis that muscle activity is up- or down-regulated in individual triceps surae muscles during prolonged walking. Thirteen healthy subjects walked on a treadmill for 60 min at 4.5 km/h, while triceps surae muscle activity, maximal muscle compound action potentials, and kinematics were recorded every 5 min, and fascicle lengths were estimated at the beginning and end of the protocol using ultrasound. After 1 h of walking, soleus activity increased by 9.3 ᠰ.2% (P < 0.05) and medial gastrocnemius activity decreased by 9.3 ᠰ.3% (P < 0.01). Gastrocnemius fascicle length at ground contact shortened by 4.45 ᠰ.99% (P < 0.001), whereas soleus fascicle length was unchanged (P = 0.988). Throughout the stance phase, medial gastrocnemius fascicle lengthening decreased by 44 ᠱ3% (P < 0.001), whereas soleus fascicle lengthening amplitude was unchanged (P = 0.650). The data suggest that a compensatory neural strategy exists between triceps surae muscles and that changes in muscle activation are generally mirrored by changes in muscle fascicle length. These findings also support the notion of muscle-specific changes in TT compliance after prolonged walking and highlight the ability of the CNS to maintain relatively constant movement patterns in spite of neuromechanical changes in individual muscles.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Physiological Society
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom548
dc.relation.ispartofpageto553
dc.relation.ispartofissue2
dc.relation.ispartofjournalJournal of Neurophysiology
dc.relation.ispartofvolume105
dc.rights.retentionY
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchMotor control
dc.subject.fieldofresearchSensory systems
dc.subject.fieldofresearchPsychology
dc.subject.fieldofresearchcode32
dc.subject.fieldofresearchcode420703
dc.subject.fieldofresearchcode320907
dc.subject.fieldofresearchcode52
dc.titleNeural compensation within the human triceps surae during prolonged walking
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Health, School of Allied Health Sciences
gro.rights.copyrightSelf-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.
gro.date.issued2011
gro.hasfulltextNo Full Text
gro.griffith.authorCronin, Neil


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