Näytä suppeat kuvailutiedot

dc.contributor.authorPéter, Annamária
dc.date.accessioned2019-12-12T11:49:03Z
dc.date.available2019-12-12T11:49:03Z
dc.date.issued2019
dc.identifier.isbn978-951-39-8013-9
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/66774
dc.description.abstractAnkle plantar flexor muscles make a major contribution to body propulsion in walking. Besides the triceps surae, deep ankle plantar flexors such as flexor hallucis longus (FHL) may also contribute to this. However, FHL function has not been extensively examined in vivo. Therefore, the aim of this thesis was to examine the effects of walking speed on FHL electromyography (EMG) activity, fascicle behaviour, and forces measured under the hallux in shod walking. Agreement between surface and intramuscular EMG was also tested in shod walking at different speeds for FHL, soleus, gastrocnemii, and tibialis anterior. Furthermore, intramuscular EMG activity of FHL and triceps surae was examined in different footwear at self-selected walking speed. As expected, FHL was highly active in the push-off phase of walking, similar to other plantar flexors. Increased walking speed was associated with higher FHL EMG activity and higher forces under the hallux, indicating an increase in the relative importance of FHL at faster walking speeds. FHL muscle fascicles operated at a near-constant length throughout the stance phase of slow walking, and shortened at faster speeds. This is similar to the fascicle mechanics of medial gastrocnemius in walking, with which FHL also shares similar architectural properties. When surface and intramuscular EMG methods were compared, there was often (~60% of all cases) poor agreement between methods for FHL, likely due to the challenge of minimising cross-talk in this muscle. Walking in shoes at preferred speed required higher plantar flexor muscle activity for body propulsion than walking in flip-flops or barefoot in most individuals, however individual variability was substantial. In shod walking, peak muscle activity occurred at the same relative time in the contact phase between participants. This may be due to the fact that shoes limit individual-specific natural foot and ankle function, imposing a restrictive motion pattern. This thesis provides in vivo evidence for the important role of FHL in walking. Using intramuscular EMG and ultrasonography, future studies should examine FHL function in individuals with Achilles tendinopathy or flatfoot, which are associated with altered FHL morphology, and perhaps also altered muscle function.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherJyväskylän yliopisto
dc.relation.ispartofseriesJYU dissertations
dc.relation.haspart<b>Artikkeli I:</b> Peter, A., Hegyi, A., Stenroth, L., Finni Juutinen, T., & Cronin, N. (2015). EMG and force production of the flexor hallucis longus muscle in isometric plantarflexion and the push-off phase of walking. <i>Journal of Biomechanics, 48 (12), 3413-3419.</i> DOI: <a href="https://doi.org/10.1016/j.jbiomech.2015.05.033"target="_blank"> 10.1016/j.jbiomech.2015.05.033</a>. JYX: <a href="https://jyx.jyu.fi/handle/123456789/50179"target="_blank"> jyx.jyu.fi/handle/123456789/50179</a>.
dc.relation.haspart<b>Artikkeli II:</b> Peter, A., Hegyi, A., Finni Juutinen, T., & Cronin, N. (2017). In vivo fascicle behavior of the flexor hallucis longus muscle at different walking speeds. <i>Scandinavian Journal of Medicine and Science in Sports, 27 (12), 1716-1723.</i> DOI: <a href="https://doi.org/10.1111/sms.12810"target="_blank"> 10.1111/sms.12810</a>. JYX: <a href="https://jyx.jyu.fi/handle/123456789/56173"target="_blank"> jyx.jyu.fi/handle/123456789/56173</a>.
dc.relation.haspart<b>Artikkeli III:</b> Péter, A., Andersson, E., Hegyi, A., Finni, T., Tarassova, O., Cronin, N., Grundström, H., Arndt, A. (2019). Comparing Surface and Fine-wire Electromyography Activity of Lower Leg Muscles at Different Walking Speeds. <i>Frontiers in Physiology, 10, 1283.</i> DOI: <a href="https://doi.org/10.3389/fphys.2019.01283"target="_blank"> 10.3389/fphys.2019.01283</a>. JYX: <a href="https://jyx.jyu.fi/handle/123456789/65834"target="_blank"> jyx.jyu.fi/handle/123456789/65834</a>.
dc.relation.haspart<b>Artikkeli IV:</b> Péter, A., Arndt, A., Hegyi, A., Finni, T., Andersson, E., Alkjær, T., Tarassova, O., Rönquist, G., Cronin, N. (2020). Effect of footwear on intramuscular EMG activity of plantar flexor muscles in walking. <i>Journal of Electromyography and Kinesiology, 55, 102474.</i> DOI: <a href="https://doi.org/10.1016/j.jelekin.2020.102474"target="_blank"> 10.1016/j.jelekin.2020.102474</a>. JYX: <a href="https://jyx.jyu.fi/handle/123456789/71912"target="_blank"> jyx.jyu.fi/handle/123456789/71912</a>.
dc.rightsIn Copyright
dc.subjectvarpaat
dc.subjectlihakset
dc.subjectkävely
dc.subjectnopeus
dc.subjectjalkineet
dc.subjectvoima
dc.subjectnilkat
dc.subjectlihassolut
dc.subjectlihasaktiivisuus
dc.subjectbiomekaniikka
dc.subjectkävelynopeus
dc.subjectreaktiovoima
dc.subjectplantaarifleksio
dc.subjectlihassolukimput
dc.subjectkoukistajalihakset
dc.subjectisovarpaan pitkä koukistajalihas
dc.subjectwalking
dc.subjectfootwear
dc.subjectplantar flexors
dc.subjectflexor hallucis longus
dc.subjectelectromyography
dc.subjectforce
dc.subjectfascicle bahaviour
dc.subject.otherflexor hallucis longusen
dc.subject.otherplantar flexorsen
dc.subject.otherfascicle behaviouren
dc.titleNeural and mechanical function of flexor hallucis longus at different walking speeds and in different footwear
dc.typeDiss.
dc.identifier.urnURN:ISBN:978-951-39-8013-9
dc.relation.issn2489-9003
dc.rights.copyright© The Author & University of Jyväskylä
dc.rights.accesslevelopenAccess
dc.type.publicationdoctoralThesis
dc.subject.ysomusclesen
dc.subject.ysoelectromyographyen
dc.subject.ysowalking (motion)en
dc.subject.ysomuscle activityen
dc.subject.ysoforceen
dc.format.contentfulltext
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.date.digitised


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