M-wave changes caused by brief voluntary and stimulated isometric contractions
| dc.contributor.author | Rodríguez Falces, Javier | |
| dc.contributor.author | Malanda Trigueros, Armando | |
| dc.contributor.author | Navallas Irujo, Javier | |
| dc.contributor.author | Place, Nicolas | |
| dc.contributor.department | Ingeniería Eléctrica, Electrónica y de Comunicación | es_ES |
| dc.contributor.department | Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren | eu |
| dc.contributor.funder | Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa | es |
| dc.date.accessioned | 2023-10-11T09:29:55Z | |
| dc.date.available | 2023-10-11T09:29:55Z | |
| dc.date.issued | 2023 | |
| dc.date.updated | 2023-10-11T08:44:47Z | |
| dc.description.abstract | Introduction Under isometric conditions, the increase in muscle force is accompanied by a reduction in the fbers’ length. The efects of muscle shortening on the compound muscle action potential (M wave) have so far been investigated only by computer simulation. This study was undertaken to assess experimentally the M-wave changes caused by brief voluntary and stimulated isometric contractions. Methods Two diferent methods of inducing muscle shortening under isometric condition were adopted: (1) applying a brief (1 s) tetanic contraction and (2) performing brief voluntary contractions of diferent intensities. In both methods, supramaximal stimulation was applied to the brachial plexus and femoral nerves to evoke M waves. In the frst method, electrical stimulation (20 Hz) was delivered with the muscle at rest, whereas in the second, stimulation was applied while participants performed 5-s stepwise isometric contractions at 10, 20, 30, 40, 50, 60, 70, and 100% MVC. The amplitude and duration of the frst and second M-wave phases were computed. Results The main fndings were: (1) on application of tetanic stimulation, the amplitude of the M-wave frst phase decreased (~10%, P<0.05), that of the second phase increased (~50%, P<0.05), and the M-wave duration decreased (~20%, P<0.05) across the frst fve M waves of the tetanic train and then plateaued for the subsequent responses; (2) when superimposing a single electrical stimulus on muscle contractions of increasing forces, the amplitude of the M-wave frst phase decreased (~20%, P<0.05), that of the second phase increased (~30%, P<0.05), and M-wave duration decreased (~30%, P<0.05) as force was raised from 0 to 60–70% MVC force. Conclusions The present results will help to identify the adjustments in the M-wave profle caused by muscle shortening and also contribute to diferentiate these adjustments from those caused by muscle fatigue and/or changes in Na+–K+ pump activity. | en |
| dc.description.sponsorship | Open Access funding provided by Universidad Pública de Navarra. This work has been supported by the Spanish Ministry of Science and Innovation under the project PID2019-109062RB-I00. | en |
| dc.format.mimetype | application/pdf | en |
| dc.identifier.citation | Rodriguez-Falces, J., Malanda, A., Navallas, J., & Place, N. (2023). M-wave changes caused by brief voluntary and stimulated isometric contractions. European Journal of Applied Physiology, 123(9), 2087-2098. https://doi.org/10.1007/s00421-023-05228-x | en |
| dc.identifier.doi | 10.1007/s00421-023-05228-x | |
| dc.identifier.issn | 1439-6319 | |
| dc.identifier.uri | https://academica-e.unavarra.es/handle/2454/46485 | |
| dc.language.iso | eng | en |
| dc.publisher | Springer | en |
| dc.relation.ispartof | European Journal of Applied Physiology (2023) 123:2087–2098 | en |
| dc.relation.projectID | info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-109062RB-I00/ES/ | |
| dc.relation.publisherversion | https://doi.org/10.1007/s00421-023-05228-x | |
| dc.rights | © The Author(s) 2023. This article is licensed under a Creative Commons Attribution 4.0 International License. | en |
| dc.rights.accessRights | info:eu-repo/semantics/openAccess | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | Fascicle length | en |
| dc.subject | Fiber diameter | en |
| dc.subject | Isometric contraction | en |
| dc.subject | Muscle bulging | en |
| dc.subject | Muscle shortening | en |
| dc.subject | Tetanic stimulation | en |
| dc.title | M-wave changes caused by brief voluntary and stimulated isometric contractions | en |
| dc.type | info:eu-repo/semantics/article | |
| dc.type.version | info:eu-repo/semantics/publishedVersion | |
| dspace.entity.type | Publication | |
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