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Title:Inter-person differences in isometric coactivations of triceps surae and tibialis anterior decrease in young, but not in older adults after 14 days of bed rest
Authors:ID Divjak, Matjaž (Author)
ID Sedej, Gašper (Author)
ID Murks, Nina (Author)
ID Gerževič, Mitja (Author)
ID Marušič, Uroš (Author)
ID Pišot, Rado (Author)
ID Šimunič, Boštjan (Author)
ID Holobar, Aleš (Author)
Files:URL URL - Source URL, visit https://doi.org/10.3389/fphys.2021.809243
 
.pdf PDF - Presentation file, download (4,31 MB)
MD5: D08A3FAF45654AA8D615EF2664B816BF
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo ZRS Koper - Science and Research Centre Koper
Abstract:We examined activation patterns of the gastrocnemius medialis (GM), gastrocnemius lateralis (GL), soleus (SO), and tibialis anterior (TA) muscles in eight older (58.4 ± 3.3 years) and seven young (23.1 ± 2.9 years) participants, before and after 14 days of horizontal bed rest. Visual feedback on the exerted muscle torque was provided to the participants. The discharge patterns of individual motor units (MUs) were studied in three repetitions of isometric plantar flexion at 30 and 60% of Maximum Voluntary Contraction (MVC), before, and 1 day after the 14-day bed rest, respectively. In the GL and GM muscles, the older participants demonstrated higher MU discharge rates than the young, regardless of the contraction level, both before and after the bed rest. In the TA and SO muscles, the differences between the older and young participants were less consistent. Detailed analysis revealed person-specific changes in the MU discharge rates after the bed rest. To quantify the coactivation patterns we calculated the correlation coefficients between the cumulative spike trains of identified MUs from each muscle, and measured the root mean square difference of the correlation coefficients between the trials of the same session (intra-session variability) and between different sessions (inter-session variability) in each participant (intra-person comparison) and across participants (inter-person comparison). In the intra-person comparison, the inter-session variability was higher than the intra-session variability, either before or after the bed rest. At 60% MVC torque, the young demonstrated higher inter-person variability of coactivation than the older participants, but this variability decreased significantly after the bed rest. In older participants, inter-person variability was consistently lower at 60% than at 30% MVC torque. In young participants, inter-person variability became lower at 60% than at 30% MVC torque only after the bed rest. Precaution is required when analyzing the MU discharge and coactivation patterns, as individual persons demonstrate individual adaptations to aging or bed rest.
Keywords:high density electromyography, muscle disuse, motor units, discharge rate, aging
Publication status:Published
Publication version:Version of Record
Article acceptance date:24.12.2021
Publication date:28.01.2022
Year of publishing:2022
Number of pages:str. 1-14
Numbering:Vol. 12, art. 809243
PID:20.500.12556/DiRROS-15445 New window
UDC:612.74:004.8
ISSN on article:1664-042X
DOI:10.3389/fphys.2021.809243 New window
COBISS.SI-ID:95552515 New window
Copyright:© 2022 Divjak, Sedej, Murks, Geržević, Marusic, Pišot, Šimunič and Holobar.
Note:Nasl. z nasl. zaslona; Soavtorji: Gašper Sedej, Nina Murks, Mitja Gerževič, Uros Marusic, Rado Pišot, Boštjan Šimunič and Aleš Holobar; Opis vira z dne 31. 1. 2022;
Publication date in DiRROS:05.09.2022
Views:573
Downloads:323
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Record is a part of a journal

Title:Frontiers in physiology
Shortened title:Front. physiol.
Publisher:Frontiers Research Foundation
ISSN:1664-042X
COBISS.SI-ID:1218939 New window

Document is financed by a project

Funder:EC - European Commission
Funding programme:Program čezmejnega sodelovanja Slovenija-Italija 2007-2013
Project number:CB147
Name:Telesna aktivnost in prehrana za kakovostno staranje
Acronym:PANGeA

Funder:ARRS - Slovenian Research Agency
Project number:J2-7357
Name:Neposredno ocenjevanje kontrolnih strategij mišic in njihovih koaktivacijskih vzorcev v robotsko podprti rehabilitaciji po možganski kapi

Funder:ARRS - Slovenian Research Agency
Project number:J2-1731
Name:Dekompozicija sestavljenih mišičnih potencialov

Funder:ARRS - Slovenian Research Agency
Project number:L7-9421
Name:Dekompozicija tenziomiograma skeletne mišice in identifikacija kontraktilnih parametrov občutljivih na mišične prilagoditve

Funder:ARRS - Slovenian Research Agency
Project number:P2-0041
Name:Računalniški sistemi, metodologije in inteligentne storitve

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:28.01.2022

Secondary language

Language:Slovenian
Keywords:mišičnoskeletni sistem, mišice, bed rest, staranje, elektromiografija


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