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Motor unit decomposition detects altered trunk neural output during seated postural maintenance after stroke.

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Τίτλος: Motor unit decomposition detects altered trunk neural output during seated postural maintenance after stroke.
Συγγραφείς: Hanawa H; Faculty of Science and Technology, Seikei University, 3-3-1 Kichijoji-Kitamachi, Musashino, Tokyo 180-8633, Japan., Hirata K; Department of Rehabilitation, Faculty of Health Sciences, Tokyo Kasei University, Saitama, Japan., Miyazawa T; Department of Rehabilitation, Faculty of Health Science, University of Human Arts and Sciences, Saitama, Japan.
Πηγή: Journal of neural engineering [J Neural Eng] 2026 Sep 02; Vol. 23 (5). Date of Electronic Publication: 2026 Sep 02.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Institute of Physics Pub Country of Publication: England NLM ID: 101217933 Publication Model: Electronic Cited Medium: Internet ISSN: 1741-2552 (Electronic) Linking ISSN: 17412552 NLM ISO Abbreviation: J Neural Eng Subsets: MEDLINE
Imprint Name(s): Original Publication: Bristol, U.K. : Institute of Physics Pub., 2004-
Ιατρικοί όροι (MeSH): Stroke*/physiopathology , Stroke*/diagnosis , Torso*/physiopathology , Torso*/physiology , Motor Neurons*/physiology , Postural Balance*/physiology , Muscle, Skeletal*/physiopathology , Posture*/physiology , Sitting Position*, Electromyography/methods ; Recruitment, Neurophysiological/physiology ; Humans ; Aged ; Female ; Male ; Middle Aged
Περίληψη: Objective.Trunk control after stroke is clinically important, yet the neural output supporting seated postural maintenance remains poorly characterized. This limits not only the physiological interpretation of trunk dysfunction but also the development of neuromodulation technologies. We therefore examined post-stroke trunk muscle control across three levels: motor unit firing behavior, the frequency distribution of surface electromyography (sEMG) envelope power, and low-frequency sEMG-kinematic coherence.Approach.Twenty individuals with subacute stroke and 20 elderly controls performed a seated postural maintenance task with bilateral arm elevation. High-density sEMG was recorded from the lumbar longissimus, and pelvic motion was measured using an inertial measurement unit. Motor unit discharge metrics, EMG envelope power, and sEMG-kinematic coherence were quantified.Main results.Twenty-two motor units from 12 participants with stroke and 14 motor units from 10 elderly participants were analyzed. Mixed-effects models showed higher 95th percentile discharge rate after stroke (beta = 4.70 Hz,p= 0.037; cluster-bootstrapp= 0.0098), whereas mean discharge rate and inter-spike interval variability were not different. EMG envelope power showed frequency-band and group-by-band effects, with the clearest difference at 0.5-5 Hz. sEMG-kinematic coherence showed no significant effects.Significance.Post-stroke trunk motor output was most clearly detected as an upper-tail motor unit discharge-rate difference rather than altered mean firing. EMG envelope power provided secondary evidence of low-frequency modulation, whereas muscle-motion coupling showed no stroke-specific modulation. Motor unit decomposition may therefore serve as a useful physiological reference for trunk motor control after stroke.
(© 2026 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.)
Contributed Indexing: Keywords: coherence; high-density surface electromyography; lumbar longissimus; motor unit; neural engineering; stroke; trunk control
Entry Date(s): Date Created: 20260824 Date Completed: 20260902 Latest Revision: 20260902
Update Code: 20260902
DOI: 10.1088/1741-2552/ae9db9
PMID: 42636873
Βάση Δεδομένων: MEDLINE
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  Data: Motor unit decomposition detects altered trunk neural output during seated postural maintenance after stroke.
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  Data: <searchLink fieldCode="AU" term="%22Hanawa+H%22">Hanawa H</searchLink>; Faculty of Science and Technology, Seikei University, 3-3-1 Kichijoji-Kitamachi, Musashino, Tokyo 180-8633, Japan.<br /><searchLink fieldCode="AU" term="%22Hirata+K%22">Hirata K</searchLink>; Department of Rehabilitation, Faculty of Health Sciences, Tokyo Kasei University, Saitama, Japan.<br /><searchLink fieldCode="AU" term="%22Miyazawa+T%22">Miyazawa T</searchLink>; Department of Rehabilitation, Faculty of Health Science, University of Human Arts and Sciences, Saitama, Japan.
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  Data: <searchLink fieldCode="JN" term="%22101217933%22">Journal of neural engineering</searchLink> [J Neural Eng] 2026 Sep 02; Vol. 23 (5). <i>Date of Electronic Publication: </i>2026 Sep 02.
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  Data: <i>Original Publication</i>: Bristol, U.K. : Institute of Physics Pub., 2004-
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  Data: <searchLink fieldCode="MM" term="%22Stroke%22">Stroke*</searchLink>/<searchLink fieldCode="MM" term="%22Stroke+physiopathology%22">physiopathology</searchLink> <br /><searchLink fieldCode="MM" term="%22Stroke%22">Stroke*</searchLink>/<searchLink fieldCode="MM" term="%22Stroke+diagnosis%22">diagnosis</searchLink> <br /><searchLink fieldCode="MM" term="%22Torso%22">Torso*</searchLink>/<searchLink fieldCode="MM" term="%22Torso+physiopathology%22">physiopathology</searchLink> <br /><searchLink fieldCode="MM" term="%22Torso%22">Torso*</searchLink>/<searchLink fieldCode="MM" term="%22Torso+physiology%22">physiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Motor+Neurons%22">Motor Neurons*</searchLink>/<searchLink fieldCode="MM" term="%22Motor+Neurons+physiology%22">physiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Postural+Balance%22">Postural Balance*</searchLink>/<searchLink fieldCode="MM" term="%22Postural+Balance+physiology%22">physiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Muscle%2C+Skeletal%22">Muscle, Skeletal*</searchLink>/<searchLink fieldCode="MM" term="%22Muscle%2C+Skeletal+physiopathology%22">physiopathology</searchLink> <br /><searchLink fieldCode="MM" term="%22Posture%22">Posture*</searchLink>/<searchLink fieldCode="MM" term="%22Posture+physiology%22">physiology</searchLink> <br /><searchLink fieldCode="MM" term="%22Sitting+Position%22">Sitting Position*</searchLink><br /><searchLink fieldCode="MH" term="%22Electromyography%22">Electromyography</searchLink>/<searchLink fieldCode="MH" term="%22Electromyography+methods%22">methods</searchLink> ; <searchLink fieldCode="MH" term="%22Recruitment%2C+Neurophysiological%22">Recruitment, Neurophysiological</searchLink>/<searchLink fieldCode="MH" term="%22Recruitment%2C+Neurophysiological+physiology%22">physiology</searchLink> ; <searchLink fieldCode="MH" term="%22Humans%22">Humans</searchLink> ; <searchLink fieldCode="MH" term="%22Aged%22">Aged</searchLink> ; <searchLink fieldCode="MH" term="%22Female%22">Female</searchLink> ; <searchLink fieldCode="MH" term="%22Male%22">Male</searchLink> ; <searchLink fieldCode="MH" term="%22Middle+Aged%22">Middle Aged</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Objective.Trunk control after stroke is clinically important, yet the neural output supporting seated postural maintenance remains poorly characterized. This limits not only the physiological interpretation of trunk dysfunction but also the development of neuromodulation technologies. We therefore examined post-stroke trunk muscle control across three levels: motor unit firing behavior, the frequency distribution of surface electromyography (sEMG) envelope power, and low-frequency sEMG-kinematic coherence.Approach.Twenty individuals with subacute stroke and 20 elderly controls performed a seated postural maintenance task with bilateral arm elevation. High-density sEMG was recorded from the lumbar longissimus, and pelvic motion was measured using an inertial measurement unit. Motor unit discharge metrics, EMG envelope power, and sEMG-kinematic coherence were quantified.Main results.Twenty-two motor units from 12 participants with stroke and 14 motor units from 10 elderly participants were analyzed. Mixed-effects models showed higher 95th percentile discharge rate after stroke (beta = 4.70 Hz,p= 0.037; cluster-bootstrapp= 0.0098), whereas mean discharge rate and inter-spike interval variability were not different. EMG envelope power showed frequency-band and group-by-band effects, with the clearest difference at 0.5-5 Hz. sEMG-kinematic coherence showed no significant effects.Significance.Post-stroke trunk motor output was most clearly detected as an upper-tail motor unit discharge-rate difference rather than altered mean firing. EMG envelope power provided secondary evidence of low-frequency modulation, whereas muscle-motion coupling showed no stroke-specific modulation. Motor unit decomposition may therefore serve as a useful physiological reference for trunk motor control after stroke.<br /> (© 2026 IOP Publishing Ltd. All rights, including for text and data mining, AI training, and similar technologies, are reserved.)
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  Data: <i>Keywords: </i>coherence; high-density surface electromyography; lumbar longissimus; motor unit; neural engineering; stroke; trunk control
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      – Type: doi
        Value: 10.1088/1741-2552/ae9db9
    Languages:
      – Code: eng
        Text: English
    Subjects:
      – SubjectFull: Electromyography methods
        Type: general
      – SubjectFull: Recruitment, Neurophysiological physiology
        Type: general
      – SubjectFull: Humans
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      – SubjectFull: Stroke physiopathology
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      – SubjectFull: Stroke diagnosis
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      – SubjectFull: Torso physiopathology
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      – SubjectFull: Motor Neurons physiology
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      – SubjectFull: Posture physiology
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      – SubjectFull: Sitting Position
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    Titles:
      – TitleFull: Motor unit decomposition detects altered trunk neural output during seated postural maintenance after stroke.
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            NameFull: Hanawa H
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              Text: 2026 Sep 02
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              Y: 2026
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