时变方向肌间相干性分析表明，在步态起始时，前向和后向摆臂同等地驱动大腿肌肉。

Time-dependent directional intermuscular coherence analysis reveals that forward and backward arm swing equally drive the upper leg muscles during gait initiation.

机构信息

University of Groningen, University Medical Center Groningen, Department of Neurology, Hanzeplein 1, POB 30.001, Groningen, The Netherlands.

Department of Electronic Engineering & York Biomedical Research Institute, University of York, York YO10 5DD, UK.

出版信息

Gait Posture. 2022 Feb;92:290-293. doi: 10.1016/j.gaitpost.2021.11.036. Epub 2021 Nov 29.

DOI:10.1016/j.gaitpost.2021.11.036

PMID:34896841

Abstract

BACKGROUND

Human bipedal gait benefits from arm swing, as it drives and shapes lower limb muscle activity in healthy participants as well as patients suffering from neurological impairment. Also during gait initiation, arm swing instructions were found to facilitate leg muscle recruitment.

RESEARCH QUESTION

The aim of the present study is to exploit the directional decomposition of coherence to examine to what extent forward and backward arm swing contribute to leg muscle recruitment during gait initiation.

METHODS

Ambulant electromyography (EMG) from shoulder muscles (deltoideus anterior and posterior) and upper leg muscles (biceps femoris and rectus femoris) was analysed during gait initiation in nineteen healthy participants (median age of 67 ± 12 (IQR) years). To assess to what extent either deltoideus anterior or posterior muscles were able to drive upper leg muscle activity during distinct stages of the gait initiation process, time dependent intermuscular coherence was decomposed into directional components based on their time lag (i.e. forward, reverse and zero-lag).

RESULTS

Coherence from the forward directed components, representing shoulder muscle signals leading leg muscle signals, revealed that deltoideus anterior (i.e. forward arm swing) and deltoideus posterior (i.e. backward arm swing) equally drive upper leg muscle activity during the gait initiation process.

SIGNIFICANCE

The presently demonstrated time dependent directional intermuscular coherence analysis could be of use for future studies examining directional coupling between muscles or brain areas relative to certain gait (or other time) events. In the present study, this analysis provided neural underpinning that both forward and backward arm swing can provide neuronal support for leg muscle recruitment during gait initiation and can therefore both serve as an effective gait rehabilitation method in patients with gait initiation difficulties.

摘要

背景

人类的双足步态受益于手臂摆动，因为它在健康参与者以及患有神经功能障碍的患者中驱动和塑造下肢肌肉活动。此外，在步态启动期间，手臂摆动指令被发现有助于腿部肌肉募集。

研究问题

本研究的目的是利用相干性的方向分解来检查在步态启动过程中，向前和向后的手臂摆动在多大程度上有助于腿部肌肉募集。

方法

在 19 名健康参与者（中位数年龄为 67 ± 12（IQR）岁）的步态启动期间，分析肩部肌肉（三角肌前、后）和大腿肌肉（股二头肌和股直肌）的运动肌电图。为了评估三角肌前或后肌肉在步态启动过程的不同阶段驱动大腿肌肉活动的程度，根据时间滞后（即向前、向后和零滞后）将时间依赖性肌间相干性分解为方向分量。