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dc.contributor.authorPethick, Jamie
dc.contributor.authorWhiteaway, Katherine
dc.contributor.authorWinter, Samantha L
dc.contributor.authorBurnley, Mark
dc.date.accessioned2021-09-14T08:38:26Z
dc.date.available2021-09-14T08:38:26Z
dc.date.issued2018-11-28
dc.identifier.citationPethick, J., Whiteaway, K, Winter, S.L. and Burnley, M. (2018) Prolonged depression of knee-extensor torque complexity following eccentric exercise. Experimental Physiology, 104(1), pp. 100-111.en
dc.identifier.issn0958-0670en
dc.identifier.pmid30485571 (pubmed)
dc.identifier.doi10.1113/ep087295en
dc.identifier.urihttp://hdl.handle.net/2436/624341
dc.descriptionThis is an accepted manuscript of an article published by Wiley in Experimental Physiology, available online: https://doi.org/10.1113/EP087295 The accepted version of the publication may differ from the final published version.en
dc.description.abstractNeuromuscular fatigue reduces the temporal structure, or complexity, of muscle torque output. Exercise-induced muscle damage reduces muscle torque output for considerably longer than high-intensity fatiguing contractions. We hypothesized that muscle-damaging eccentric exercise would lead to a persistent decrease in torque complexity, whereas fatiguing exercise would not. Ten healthy participants performed five isometric contractions (6 s contraction, 4 s rest) at 50% maximal voluntary contraction (MVC) before, immediately after and 10, 30 and 60 min and 24 h after eccentric (muscle-damaging) and isometric (fatiguing) exercise. These contractions were also repeated 48 h and 1 week after eccentric exercise. Torque and surface EMG signals were sampled throughout each test. Complexity and fractal scaling were quantified using approximate entropy (ApEn) and the detrended fluctuation analysis α exponent (DFA α). Global, central and peripheral perturbations were quantified using MVCs with femoral nerve stimulation. Complexity decreased after both eccentric [ApEn, mean (SD), from 0.39 (0.10) to 0.20 (0.12), P < 0.001] and isometric exercise [from 0.41 (0.13) to 0.09 (0.04); P < 0.001]. After eccentric exercise, ApEn and DFA α required 24 h to recover to baseline levels, but after isometric exercise they required only 10 min. The MVC torque remained reduced [from 233.6 (74.2) to 187.5 (64.7) N m] 48 h after eccentric exercise, with such changes evident only up to 60 min after isometric exercise [MVC torque, from 246.1 (77.2) to 217.9 (71.8) N m]. The prolonged depression in maximal muscle torque output is therefore accompanied by a prolonged reduction in torque complexity.en
dc.description.sponsorshipThis work was supported by a University of Kent 50th Anniversary Scholarship.en
dc.formatapplication/pdfen
dc.languageeng
dc.language.isoenen
dc.publisherWileyen
dc.relation.urlhttps://physoc.onlinelibrary.wiley.com/doi/full/10.1113/EP087295en
dc.subjectcomplexityen
dc.subjecteccentricen
dc.subjectfatigueen
dc.subjectfractal scalingen
dc.subjectnon-linear dynamicsen
dc.subject.meshKnee
dc.subject.meshMuscle, Skeletal
dc.subject.meshKnee Joint
dc.subject.meshFemoral Nerve
dc.subject.meshHumans
dc.subject.meshExercise
dc.subject.meshMuscle Fatigue
dc.subject.meshMuscle Contraction
dc.subject.meshIsometric Contraction
dc.subject.meshMale
dc.titleProlonged depression of knee-extensor torque complexity following eccentric exerciseen
dc.typeJournal articleen
dc.identifier.eissn1469-445X
dc.identifier.journalExperimental Physiologyen
dc.date.updated2021-09-09T10:53:46Z
dc.contributor.institutionEndurance Research Group, School of Sport and Exercise Sciences, University of Kent, UK.
pubs.place-of-publicationEngland
dc.date.accepted2018-11-12
rioxxterms.funderUniversity of Kenten
rioxxterms.identifier.projectUOW14092021MBen
rioxxterms.versionAMen
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
rioxxterms.licenseref.startdate2021-09-14en
dc.source.volume104
dc.source.issue1
dc.source.beginpage100
dc.source.endpage111
dc.description.versionPublished version
refterms.dateFCD2021-09-14T08:38:02Z
refterms.versionFCDAM
refterms.dateFOA2021-09-14T08:38:27Z


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