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Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing.
Neurosci Lett. 2018 11 01; 686:193-197.NL

Abstract

Plantar flexor muscles play a crucial role in maintaining balance during quiet standing. The purpose of this study was to investigate the effect of their fatigue on common input to these muscles, using a coherence analysis. Thirteen healthy young male adults stood quietly before and after a fatigue protocol consisting of a heel raise exercise. Center of pressure (COP) displacement and electromyograms (EMGs) from the bilateral medial gastrocnemius and soleus muscles were recorded. EMG-EMG coherences between the bilateral homologous muscles (bilateral coherence) and within the unilateral muscles (unilateral coherence) in the right leg were calculated. Anteroposterior and mediolateral COP speeds, mediolateral COP SD, and 95% confidence ellipse area were larger in post- than pre-fatigue condition. Bilateral and unilateral coherences in delta band, that reflect comodulation of muscle activation, and bilateral coherence in alpha band, that is supposedly associated with the subcortical inputs, were smaller in post- than pre-fatigue condition. Unilateral coherences in alpha and beta band, reflecting physiological tremor and corticospinal drive, respectively, were not different between pre- and post-fatigue conditions. It is suggested that the low-frequency common input to the plantar flexor muscles is reduced following the fatiguing contraction during quiet standing, likely by a change in the postural control strategy.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Watanabe T
Department of Physical Therapy, Nagoya University Graduate School of Medicine, Nagoya-shi, Aichi, 461-8673 Japan; Japan Society for the Promotion of Science, Tokyo, Japan. Electronic address: watanabe.tatsunori@h.mbox.nagoya-u.ac.jp.
Saito K
Department of Physical Therapy, Nagoya University Graduate School of Medicine, Nagoya-shi, Aichi, 461-8673 Japan.
Ishida K
Department of Physical Therapy, Nagoya University Graduate School of Medicine, Nagoya-shi, Aichi, 461-8673 Japan.
Tanabe S
Faculty of Rehabilitation, Fujita Health University School of Health Sciences, Toyoake, Aichi, 470-1192 Japan.
Nojima I
Department of Physical Therapy, Nagoya University Graduate School of Medicine, Nagoya-shi, Aichi, 461-8673 Japan.

MeSH

AdultFemaleFootHumansLower ExtremityMaleMuscle ContractionMuscle FatigueMuscle, SkeletalPostural BalancePostureStanding PositionTremorYoung Adult

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

30218767

Citation

Watanabe, Tatsunori, et al. "Fatigue-induced Decline in Low-frequency Common Input to Bilateral and Unilateral Plantar Flexors During Quiet Standing." Neuroscience Letters, vol. 686, 2018, pp. 193-197.
Watanabe T, Saito K, Ishida K, et al. Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing. Neurosci Lett. 2018;686:193-197.
Watanabe, T., Saito, K., Ishida, K., Tanabe, S., & Nojima, I. (2018). Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing. Neuroscience Letters, 686, 193-197. https://doi.org/10.1016/j.neulet.2018.09.019
Watanabe T, et al. Fatigue-induced Decline in Low-frequency Common Input to Bilateral and Unilateral Plantar Flexors During Quiet Standing. Neurosci Lett. 2018 11 1;686:193-197. PubMed PMID: 30218767.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing. AU - Watanabe,Tatsunori, AU - Saito,Kotaro, AU - Ishida,Kazuto, AU - Tanabe,Shigeo, AU - Nojima,Ippei, Y1 - 2018/09/12/ PY - 2018/03/22/received PY - 2018/07/28/revised PY - 2018/09/11/accepted PY - 2018/9/16/pubmed PY - 2019/3/8/medline PY - 2018/9/16/entrez KW - Common input KW - EMG-EMG coherence KW - Muscle fatigue KW - Plantar flexors KW - Postural control KW - Quiet standing SP - 193 EP - 197 JF - Neuroscience letters JO - Neurosci Lett VL - 686 N2 - Plantar flexor muscles play a crucial role in maintaining balance during quiet standing. The purpose of this study was to investigate the effect of their fatigue on common input to these muscles, using a coherence analysis. Thirteen healthy young male adults stood quietly before and after a fatigue protocol consisting of a heel raise exercise. Center of pressure (COP) displacement and electromyograms (EMGs) from the bilateral medial gastrocnemius and soleus muscles were recorded. EMG-EMG coherences between the bilateral homologous muscles (bilateral coherence) and within the unilateral muscles (unilateral coherence) in the right leg were calculated. Anteroposterior and mediolateral COP speeds, mediolateral COP SD, and 95% confidence ellipse area were larger in post- than pre-fatigue condition. Bilateral and unilateral coherences in delta band, that reflect comodulation of muscle activation, and bilateral coherence in alpha band, that is supposedly associated with the subcortical inputs, were smaller in post- than pre-fatigue condition. Unilateral coherences in alpha and beta band, reflecting physiological tremor and corticospinal drive, respectively, were not different between pre- and post-fatigue conditions. It is suggested that the low-frequency common input to the plantar flexor muscles is reduced following the fatiguing contraction during quiet standing, likely by a change in the postural control strategy. SN - 1872-7972 UR - https://www.unboundmedicine.com/medline/citation/30218767/Fatigue_induced_decline_in_low_frequency_common_input_to_bilateral_and_unilateral_plantar_flexors_during_quiet_standing_ DB - PRIME DP - Unbound Medicine ER -