Fatigue-related modulation of low-frequency common drive to motor units.
Discharge–force relation
EMG
Fatigue
Firing rate
Stabilogram diffusion analysis
Journal
European journal of applied physiology
ISSN: 1439-6327
Titre abrégé: Eur J Appl Physiol
Pays: Germany
ID NLM: 100954790
Informations de publication
Date de publication:
Jun 2020
Jun 2020
Historique:
received:
23
09
2019
accepted:
01
04
2020
pubmed:
17
4
2020
medline:
18
3
2021
entrez:
17
4
2020
Statut:
ppublish
Résumé
This study investigated fatigue-related modulation of common neural inputs to motor units (MUs) under 5 Hz, which determines force precision control. Twenty-seven adults performed a sequence of fatiguing contractions. The participants were assessed with a static isometric index abduction at 20% maximal voluntary contraction in the pre-test and post-test. Discharge characteristics of MUs of the first dorsal interosseous muscle were analyzed with decomposed EMG signals. Along with increases in the mean (58.40 ± 11.76 ms → 62.55 ± 10.83 ms, P = 0.029) and coefficient of variation (0.204 ± .014 → 0.215 ± 0.017, P = 0.002) in inter-spike intervals, the fatiguing contraction caused reductions in the mean frequency (16.84 ± 3.31 Hz → 15.59 ± 3.21 Hz, P = 0.027) and spectral dispersions (67.54 ± 4.49 → 62.64 ± 6.76 Hz, P = 0.007) of common neural drive, as estimated with smoothed cumulative motor unit spike trains (SCMUSTs). Stabilogram diffusion analysis of SCMUSTs revealed significant fatigue-related reductions in the long-term effective diffusion coefficient (1.91 ± 0.77 Hz Muscular fatigue could compress and shift the low-frequency common drive to MUs toward lower spectral bands, thereby enhancing transmission of twitch forces through the muscle-tendon complex with a low-pass filter property. The fatigue-induced changes involve increased closed-loop control of the common modulation of MU discharge rates.
Identifiants
pubmed: 32297005
doi: 10.1007/s00421-020-04363-z
pii: 10.1007/s00421-020-04363-z
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1305-1317Subventions
Organisme : Ministry of Science and Technology, Taiwan
ID : MOST 106-2410-H-040-012
Organisme : Ministry of Science and Technology, Taiwan
ID : MOST 107-2314-B-006 -017 -MY3
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