title: Descending neural drives to ankle muscles during gait and their relationships with clinical functions in patients after stroke.
abstract: OBJECTIVE
  The objective of this study was to investigate the descending neural drive to ankle muscles during gait in stroke patients using a coherence analysis of surface electromyographic (EMG) recordings and the relationships of the drive with clinical functions.
  
  
  METHODS
  EMG recordings of the paired tibialis anterior (TA), medial and lateral gastrocnemius (MG and LG), and TA-LG muscles were used to calculate intramuscular, synergistic, and agonist-antagonist muscle coherence, respectively, in 11 stroke patients and 9 healthy controls. Paretic motor function, sensory function, spasticity, ankle muscle strength, and gait performance were evaluated.
  
  
  RESULTS
  Paretic TA-TA and MG-LG beta band (15-30 Hz) coherences were significantly lower compared with the non-paretic side and controls. TA-LG beta band coherence was significantly higher on both sides compared with controls. Paretic TA-TA beta band coherence positively correlated with gait speed, and paretic TA-LG beta band coherence negatively correlated with paretic ankle plantar flexor muscle strength.
  
  
  CONCLUSIONS
  The intramuscular and synergistic muscle neural drives were reduced during gait on the paretic side in stroke patients. The agonist-antagonist muscle neural drive was increased to compensate for paretic ankle muscle weakness.
  
  
  CONCLUSIONS
  Descending neural drive reorganization to agonist-antagonist muscles is important for patients with paretic ankle muscle weakness.
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science, Tokyo, Japan. Electronic address: kitatani.ryosuke.88x@st.kyoto-u.ac.jp.
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kitatani
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Ohata
authors.affiliation: Aijinkai Rehabilitation Hospital, Osaka, Japan.
authors.forename: Yumi
authors.initials: Y
authors.lastname: Aga
authors.affiliation: Department of Rehabilitation, Kansai Medical University Hirakata Hospital, Osaka, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Mashima
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Japan Society for the Promotion of Science, Tokyo, Japan.
authors.forename: Yu
authors.initials: Y
authors.lastname: Hashiguchi
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Department of Rehabilitation, Kansai Medical University Hirakata Hospital, Osaka, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Wakida
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Maeda
authors.affiliation: Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
authors.forename: Shigehito
authors.initials: S
authors.lastname: Yamada
mesh_terms: D000368:Aged; D000842:Ankle / Q000294:innervation / Q000502:physiology*; D004576:Electromyography / Q000379:methods*; D005260:Female; D005684:Gait / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology; D020521:Stroke / Q000175:diagnosis / Q000503:physiopathology*
keywords: Coherence; Electromyography; Gait; Muscle coactivation; Stroke