Intramuscular Coherence of the Lower Flexor Muscles during Robotic Ankle-Assisted Gait

Kei Nakagawa, Naoto Kadono, Tomohiro Shimoda, Takafumi Mitsuhara, Eiichiro Tanaka, Louis Yuge*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A close-fitting assisted walking device (RE-Gait) designed to assist ankle movements might be a novel approach for acquiring the forefoot rocker function in the gait cycle. The purpose of the present study was to investigate the effects of using RE-Gait by evaluating the intramuscular coherence (IMC) of the two parts of the tibialis anterior muscles (TA), which could indicate whether a common synaptic drive is present. Seventeen healthy volunteers walked on a treadmill at a comfortable speed before, during, and immediately after 15-minute RE-Gait intervention. After RE-Gait intervention, IMC of the two parts of the TA muscles in the beta frequency band in the initial swing phase was significantly enhanced during RE-Gait intervention. In addition, IMCs in the beta and low-gamma frequency bands were significantly correlated with the enhancement ratio of the step length. These results suggest that robotic ankle plantar flexion and dorsiflexion assistance in the initial swing phase may be effective for improving gait function with enhancement of the functioning of the sensorimotor loop.

Original languageEnglish
JournalJournal of Motor Behavior
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • ankle joint
  • intramuscular coherence
  • tibialis anterior muscle
  • walking assistive robot

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

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