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dc.contributor.authorValadão, Pedro
dc.contributor.authorBar-On, Lynn
dc.contributor.authorCenni, Francesco
dc.contributor.authorPiitulainen, Harri
dc.contributor.authorAvela, Janne
dc.contributor.authorFinni, Taija
dc.date.accessioned2023-01-23T06:41:44Z
dc.date.available2023-01-23T06:41:44Z
dc.date.issued2022
dc.identifier.citationValadão, P., Bar-On, L., Cenni, F., Piitulainen, H., Avela, J., & Finni, T. (2022). Revising the stretch reflex threshold method to measure stretch hyperreflexia in cerebral palsy. <i>Frontiers in Bioengineering and Biotechnology</i>, <i>10</i>, Article 897852. <a href="https://doi.org/10.3389/fbioe.2022.897852" target="_blank">https://doi.org/10.3389/fbioe.2022.897852</a>
dc.identifier.otherCONVID_172577172
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/85120
dc.description.abstractHyper-resistance is an increased resistance to passive muscle stretch, a common feature in neurological disorders. Stretch hyperreflexia, an exaggerated stretch reflex response, is the neural velocity-dependent component of hyper-resistance, and has been quantitatively measured using the stretch reflex threshold (i.e., joint angle at the stretch reflex electromyographic onset). In this study, we introduce a correction in how the stretch reflex threshold is calculated, by accounting for the stretch reflex latency (i.e., time between the stretch reflex onset at the muscle spindles and its appearance in the electromyographic signal). Furthermore, we evaluated how this correction affects the stretch reflex threshold in children and young adults with spastic cerebral palsy. A motor-driven ankle dynamometer induced passive ankle dorsiflexions at four incremental velocities in 13 children with cerebral palsy (mean age: 13.5 years, eight males). The stretch reflex threshold for soleus and medial gastrocnemius muscles was calculated as 1) the joint angle corresponding to the stretch reflex electromyographic onset (i.e., original method); and as 2) the joint angle corresponding to the electromyographic onset minus the individual Hoffmann-reflex latency (i.e., latency corrected method). The group linear regression slopes between stretch velocity and stretch reflex threshold differed in both muscles between methods (p < 0.05). While the original stretch reflex threshold was velocity dependent in both muscles (p < 0.05), the latency correction rendered it velocity independent. Thus, the effects of latency correction on the stretch reflex threshold are substantial, especially at higher stretch velocities, and should be considered in future studies.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherFrontiers Media SA
dc.relation.ispartofseriesFrontiers in Bioengineering and Biotechnology
dc.rightsCC BY 4.0
dc.subject.otherhyperreflexia
dc.subject.otherneurophysiology
dc.subject.otherstretch reflex
dc.subject.otherelectromyography
dc.subject.othercerebral palsy
dc.titleRevising the stretch reflex threshold method to measure stretch hyperreflexia in cerebral palsy
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202301231418
dc.contributor.laitosLiikuntatieteellinen tiedekuntafi
dc.contributor.laitosFaculty of Sport and Health Sciencesen
dc.contributor.oppiaineBiomekaniikkafi
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.issn2296-4185
dc.relation.volume10
dc.type.versionpublishedVersion
dc.rights.copyright© 2022 Valadão, Bar-On, Cenni, Piitulainen, Avela and Finni.
dc.rights.accesslevelopenAccessfi
dc.relation.grantnumberOKM/28/626/2022, OKM/74/626/2022, OKM/64/626/2023
dc.relation.grantnumber327288
dc.relation.grantnumber311877
dc.relation.grantnumber326988
dc.subject.ysoneurofysiologia
dc.subject.ysoelektromyografia
dc.subject.ysoCP-oireyhtymä
dc.subject.ysohermo-lihastoiminta
dc.subject.ysorefleksit
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p2316
jyx.subject.urihttp://www.yso.fi/onto/yso/p22356
jyx.subject.urihttp://www.yso.fi/onto/yso/p13394
jyx.subject.urihttp://www.yso.fi/onto/yso/p25107
jyx.subject.urihttp://www.yso.fi/onto/yso/p2944
dc.rights.urlhttps://creativecommons.org/licenses/by/4.0/
dc.relation.doi10.3389/fbioe.2022.897852
dc.relation.funderMinistry of Education and Cultureen
dc.relation.funderResearch Council of Finlanden
dc.relation.funderResearch Council of Finlanden
dc.relation.funderResearch Council of Finlanden
dc.relation.funderOpetus- ja kulttuuriministeriöfi
dc.relation.funderSuomen Akatemiafi
dc.relation.funderSuomen Akatemiafi
dc.relation.funderSuomen Akatemiafi
jyx.fundingprogramOthersen
jyx.fundingprogramResearch costs of Academy Research Fellow, AoFen
jyx.fundingprogramResearch profiles, AoFen
jyx.fundingprogramAcademy Research Fellow, AoFen
jyx.fundingprogramMuutfi
jyx.fundingprogramAkatemiatutkijan tutkimuskulut, SAfi
jyx.fundingprogramProfilointi, SAfi
jyx.fundingprogramAkatemiatutkija, SAfi
jyx.fundinginformationThis work was supported by the Olvi Foundation, Research Foundation of Cerebral Palsy Alliance (PHD00321), Finnish Cultural Foundation, University of Jyväskylä, Academy of Finland (grants #296240, #307250, #327288, #311877, #326988), including “Brain changes across the life-span” profiling funding to University of Jyväskylä, Jane and Aatos Erkko Foundation (#602.274), and the Netherlands Organization for Scientific Research (NWO-016.186.144). Ministry of Education and Culture (OKM/28/626/2022).
dc.type.okmA1


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