Control of motor output during steady submaximal contractions is modulated by contraction history

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dc.authoriddarendeli, abdulkerim/0000-0002-4581-5567
dc.authoridENOKA, ROGER/0000-0002-7881-2397
dc.contributor.authorDarendeli, Abdulkerim
dc.contributor.authorEnoka, Roger M.
dc.date.accessioned2024-10-26T18:09:44Z
dc.date.available2024-10-26T18:09:44Z
dc.date.issued2024
dc.departmentSivas Cumhuriyet Üniversitesi
dc.description.abstractThe purpose of the study was to investigate the influence of contraction history on force steadiness and the associated EMG activity during submaximal isometric contractions performed with the dorsiflexor muscles. The key feature of the protocol was a triangular ramp contraction performed in the middle of a steady contraction at a lower target force. The target force during the ramp contraction was 20% MVC greater than that during the steady contraction. Thirty-seven healthy individuals (21 men and 16 women) performed the submaximal tasks with the ankle dorsiflexors. Electromyography (EMG) signals were recorded from tibialis anterior with a pair of surface electrodes. The coefficient of variation for force was significantly greater during the second steady contraction compared with the first one at each of the seven target forces (p < 0.015; d = 0.38-0.92). Although the average applied force during the steady contractions before and after the triangular contraction was the same (p = 0.563), the mean EMG amplitude for the steady contractions performed after the triangular contraction was significantly greater at each of the seven target forces (p < 0.0001; d = 0.44-0.68). Also, there were significant differences in mean EMG frequency between the steady contractions performed before and after the triangular contraction (p < 0.01; d = 0.13-0.82), except at 10 and 20% MVC force. The greater force fluctuations during a steady submaximal contraction after an intervening triangular contraction indicate a change in the discharge characteristics of the involved motor units.
dc.description.sponsorshipNational Multiple Sclerosis Society [RG-2206-39688]; National Multiple Sclerosis Society in the USA
dc.description.sponsorshipWe thank the volunteers who participated in our study and the members of our laboratory for helpful discussions on this project. R.M.E. was supported by an award from the National Multiple Sclerosis Society in the USA (project RG-2206-39688).
dc.identifier.doi10.1007/s00221-023-06774-8
dc.identifier.endpage683
dc.identifier.issn0014-4819
dc.identifier.issn1432-1106
dc.identifier.issue3
dc.identifier.pmid38260992
dc.identifier.scopus2-s2.0-85182836847
dc.identifier.scopusqualityQ3
dc.identifier.startpage675
dc.identifier.urihttps://doi.org/10.1007/s00221-023-06774-8
dc.identifier.urihttps://hdl.handle.net/20.500.12418/30259
dc.identifier.volume242
dc.identifier.wosWOS:001147604800001
dc.identifier.wosqualityN/A
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofExperimental Brain Research
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectForce steadiness
dc.subjectMuscle contraction
dc.subjectEMG power density spectrum
dc.subjectNeural drive to muscle
dc.subjectSynaptic input
dc.titleControl of motor output during steady submaximal contractions is modulated by contraction history
dc.typeArticle

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