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dc.contributor.authorGomez-Guerrero, Gonzalo
dc.contributor.authorAnsdell, Paul
dc.contributor.authorHowatson, Glyn
dc.contributor.authorAvela, Janne
dc.contributor.authorWalker, Simon
dc.date.accessioned2023-12-12T12:43:53Z
dc.date.available2023-12-12T12:43:53Z
dc.date.issued2023
dc.identifier.citationGomez-Guerrero, G., Ansdell, P., Howatson, G., Avela, J., & Walker, S. (2023). Contraction intensity modulates spinal excitability during transcranial magnetic stimulation-evoked silent period in rectus femoris muscle. <i>European Journal of Applied Physiology</i>, <i>Early online</i>. <a href="https://doi.org/10.1007/s00421-023-05367-1" target="_blank">https://doi.org/10.1007/s00421-023-05367-1</a>
dc.identifier.otherCONVID_194747087
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/92279
dc.description.abstractPurpose Reduced spinal excitability during the transcranial magnetic stimulation (TMS) silent period (SP) has recently been shown to last longer than previously thought in the upper limbs, as assessed via spinal electrical stimulation. Further, there is reason to expect that contraction intensity affects the duration of the reduced spinal excitability. Methods This study investigated spinal excitability at different time delays within the TMS-evoked SP in m.rectus femoris. Fifteen participants performed non-fatiguing isometric knee extensions at 25%, 50% and 75% of maximum voluntary contraction (MVC). Lumbar stimulation (LS) induced a lumbar-evoked potential (LEP) of 50% resting M-max. TMS stimulator output induced a SP lasting ~ 200 ms. In each contraction, a LEP (unconditioned) was delivered ~ 2–3 s prior to TMS, which was followed by a second LEP (conditioned) 60, 90, 120 or 150 ms into the silent period. Five contractions were performed at each contraction intensity and for each time delay in random order. Results Compared to the unconditioned LEP, the conditioned LEP amplitude was reduced (− 28 ± 34%, p = 0.007) only at 60 ms during 25% of MVC. Conditioned LEP amplitudes during 50% and 75% of MVC were reduced at 60 ms (− 37 ± 47%, p = 0.009 and − 37 ± 42%, p = 0.005, respectively) and 150 ms (− 30% ± 37%, p = 0.0083 and − 37 ± 43%, p = 0.005, respectively). LEP amplitude at 90 ms during 50% of MVC also reduced (− 25 ± 35%, p = 0.013). Conclusion Reduced spinal excitability is extended during 50% and 75% of MVC. In future, paired TMS-LS could be a potential method to understand changes in spinal excitability during SP (at different contraction intensities) when testing various neurophysiological phenomena.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofseriesEuropean Journal of Applied Physiology
dc.rightsCC BY 4.0
dc.subject.otherlumbar stimulation
dc.subject.otherspinal inhibition
dc.subject.otherlower limbs
dc.subject.otherforce production
dc.subject.othercortico-spinal tract
dc.titleContraction intensity modulates spinal excitability during transcranial magnetic stimulation-evoked silent period in rectus femoris muscle
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202312128270
dc.contributor.laitosLiikuntatieteellinen tiedekuntafi
dc.contributor.laitosFaculty of Sport and Health Sciencesen
dc.contributor.oppiaineHyvinvoinnin tutkimuksen yhteisöfi
dc.contributor.oppiaineBiomekaniikkafi
dc.contributor.oppiaineSchool of Wellbeingen
dc.contributor.oppiaineBiomechanicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn1439-6319
dc.relation.volumeEarly online
dc.type.versionpublishedVersion
dc.rights.copyright© The Author(s) 2023
dc.rights.accesslevelopenAccessfi
dc.subject.ysovoimantuotto (fysiologia)
dc.subject.ysojalat
dc.subject.ysoselkäranka
dc.subject.ysolanneranka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p25323
jyx.subject.urihttp://www.yso.fi/onto/yso/p13757
jyx.subject.urihttp://www.yso.fi/onto/yso/p110
jyx.subject.urihttp://www.yso.fi/onto/yso/p5598
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.1007/s00421-023-05367-1
jyx.fundinginformationOpen Access funding provided by University of Jyväskylä (JYU).
dc.type.okmA1


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