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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 [Elektronski vir]Divjak, Matjaž ...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.Source: Frontiers in physiology [Elektronski vir]. - ISSN 1664-042X (Vol. 12, art. 809243, Jan. 2022, str. 1-14)Type of material - e-article ; adult, seriousPublish date - 2022Language - englishCOBISS.SI-ID - 95552515
Author
Divjak, Matjaž |
Sedej, Gašper, 1988- |
Murks, Nina |
Gerževič, Mitja |
Marušič, Uroš |
Pišot, Rado |
Šimunič, Boštjan |
Holobar, Aleš
Topics
mišičnoskeletni sistem |
mišice |
bed rest |
staranje |
elektromiografija |
high density electromyography |
muscle disuse |
motor units |
discharge rate |
aging
Author | Divjak, Matjaž ... |
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 [Elektronski vir] |
Publication date | 2022-01-28 |
COBISS.SI-ID | 95552515 |
Publication version in repository | Publisher's version |
Publication licence | Creative Commons Attribution 4.0 International |
Embargo | Immediate publication for public |
Project(s) from which the publication was funded
Title | Acronym | Project ID | Funder |
---|---|---|---|
Dekompozicija sestavljenih mišičnih potencialov | J2-1731-2019 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
|
Dekompozicija tenziomiograma skeletne mišice in identifikacija kontraktilnih parametrov občutljivih na mišične prilagoditve | L7-9421-2018 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
|
Neposredno ocenjevanje kontrolnih strategij mišic in njihovih koaktivacijskih vzorcev v robotsko podprti rehabilitaciji po možganski kapi | J2-7357-2016 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
|
Računalniški sistemi, metodologije in inteligentne storitve | P2-0041-2020 |
Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije |
|
Telesna aktivnost in prehrana za kakovostno staranje | PANGeA | CB147 |
Files that belong to the publication
Link |
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https://doi.org/10.3389/fphys.2021.809243 |
https://dirros.openscience.si/IzpisGradiva.php?id=15445 |
https://dk.um.si/IzpisGradiva.php?id=82881 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Divjak, Matjaž | 21537 |
Sedej, Gašper, 1988- | |
Murks, Nina | 57131 |
Gerževič, Mitja | 25787 |
Marušič, Uroš | 34516 |
Pišot, Rado | 11612 |
Šimunič, Boštjan | 21102 |
Holobar, Aleš | 21301 |
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