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Association of gait recovery with intramuscular coherence of the Vastus medialis muscle during assisted gait in subacute stroke.

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Title: Association of gait recovery with intramuscular coherence of the Vastus medialis muscle during assisted gait in subacute stroke.
Authors: Hasui, Naruhito (AUTHOR), Mizuta, Naomichi (AUTHOR), Matsunaga, Ayaka (AUTHOR), Higa, Yasutaka (AUTHOR), Sato, Masahiro (AUTHOR), Nakatani, Tomoki (AUTHOR), Taguchi, Junji (AUTHOR), Morioka, Shu (AUTHOR)
Source: Neurological Sciences. Aug2025, Vol. 46 Issue 8, p3735-3745. 11p.
Subjects: Vastus medialis, Coherence (Physics), Stroke, Stroke patients, Gait in humans
Abstract: Objectives: We aimed to investigate the effect of descending neural drive during assisted gait training on gait recovery in non-ambulatory stroke patients and the effect of 1-month gait training on the descending neural drive. Methods: Twenty stroke patients unable to walk independently were included in this longitudinal study. Intermuscular coherence analysis (beta band; 15–30 Hz) was performed on electromyography signals recorded from the proximal and distal segments of the vastus medialis (VM) and lateral hamstring (LH) on the paretic side (i.e., VM-VM, VM-LH, and LH-LH coherence) during assisted gait used knee-ankle foot orthosis. Lower limb flexion and extension angles and step count during training were also assessed. Gait recovery was assessed by the number of days required to achieve functional ambulation category (FAC) 3 (supervised gait) since stroke onset. The participants were then classified into the FAC 3-achieved and FAC 3-not achieved groups. Results: Days to achieve FAC 3 was significantly associated with VM-VM coherence in the beta band (ρ = −0.648, p = 0.003). VM-VM coherence in the beta band during assisted gait significantly increased in the FAC 3-achieved group than in the FAC 3-not achieved group. In contrast, VM-LH and LH-LH coherence were not significantly associated with the days to achieve FAC3 and were not significantly increased by training. Conclusion: Stroke survivors who were unable to walk independently but had reacquired supervised gait exhibited high VM-VM coherence, which increased with gait training. This finding indicates the presence of residual descending neural drive related to weight acceptance. [ABSTRACT FROM AUTHOR]
Copyright of Neurological Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Association of gait recovery with intramuscular coherence of the Vastus medialis muscle during assisted gait in subacute stroke.
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  Data: <searchLink fieldCode="AR" term="%22Hasui%2C+Naruhito%22">Hasui, Naruhito</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mizuta%2C+Naomichi%22">Mizuta, Naomichi</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Matsunaga%2C+Ayaka%22">Matsunaga, Ayaka</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Higa%2C+Yasutaka%22">Higa, Yasutaka</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sato%2C+Masahiro%22">Sato, Masahiro</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nakatani%2C+Tomoki%22">Nakatani, Tomoki</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Taguchi%2C+Junji%22">Taguchi, Junji</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Morioka%2C+Shu%22">Morioka, Shu</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Neurological+Sciences%22">Neurological Sciences</searchLink>. Aug2025, Vol. 46 Issue 8, p3735-3745. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Vastus+medialis%22">Vastus medialis</searchLink><br /><searchLink fieldCode="DE" term="%22Coherence+%28Physics%29%22">Coherence (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Stroke%22">Stroke</searchLink><br /><searchLink fieldCode="DE" term="%22Stroke+patients%22">Stroke patients</searchLink><br /><searchLink fieldCode="DE" term="%22Gait+in+humans%22">Gait in humans</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Objectives: We aimed to investigate the effect of descending neural drive during assisted gait training on gait recovery in non-ambulatory stroke patients and the effect of 1-month gait training on the descending neural drive. Methods: Twenty stroke patients unable to walk independently were included in this longitudinal study. Intermuscular coherence analysis (beta band; 15–30 Hz) was performed on electromyography signals recorded from the proximal and distal segments of the vastus medialis (VM) and lateral hamstring (LH) on the paretic side (i.e., VM-VM, VM-LH, and LH-LH coherence) during assisted gait used knee-ankle foot orthosis. Lower limb flexion and extension angles and step count during training were also assessed. Gait recovery was assessed by the number of days required to achieve functional ambulation category (FAC) 3 (supervised gait) since stroke onset. The participants were then classified into the FAC 3-achieved and FAC 3-not achieved groups. Results: Days to achieve FAC 3 was significantly associated with VM-VM coherence in the beta band (ρ = −0.648, p = 0.003). VM-VM coherence in the beta band during assisted gait significantly increased in the FAC 3-achieved group than in the FAC 3-not achieved group. In contrast, VM-LH and LH-LH coherence were not significantly associated with the days to achieve FAC3 and were not significantly increased by training. Conclusion: Stroke survivors who were unable to walk independently but had reacquired supervised gait exhibited high VM-VM coherence, which increased with gait training. This finding indicates the presence of residual descending neural drive related to weight acceptance. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Neurological Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10072-025-08138-2
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              Text: Aug2025
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