Muscle Synergies of the Lower Extremities During Gait Initiation in Individuals With and Without Chronic Ankle Instability.

IF 2.2 3区 医学 Q1 ORTHOPEDICS
Shaghayegh Zivari, Mohammad Yousefi, Abbas Farjad Pezeshk, Teddy Caderby
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Abstract

Background: Chronic ankle instability (CAI) disrupts postural stability after ankle sprains and inadequate treatment. Gait initiation (GI), governed by central nervous system (CNS) patterns, is used to evaluate stability. Muscle synergy, which reflects coordinated activations, reveals neuromuscular control. This study investigates lower limb muscle synergies during GI in individuals with and without CAI to understand their neuromuscular strategies.

Design: Cross-sectional study.

Setting: Laboratory.

Method: This study involved 20 participants, 10 healthy men and 10 patients with CAI. Six electrodes were applied per the SENIAM guidelines, and markers were set according to the cluster model. The participants initiated gait after an auditory cue was presented on a force plate. OpenSim simulated a musculoskeletal model using kinematic and muscle activity data. Muscle synergies were analyzed via HALS in MATLAB. Statistical tests, including Wilcoxon and one-way ANOVA, were conducted in SPSS with p < 0.05 as the significance threshold.

Results: The number of muscle synergies was not significantly different between the healthy and CAI groups (p > 0.05). However, muscle weight differed significantly between synergies 1 and 2 (p < 0.05). In synergy 1, the TA had greater weighting in the CAI group, whereas synergy 2 had higher RF and GM_L weightings in the CAI group. Synergy 3 revealed greater PL weight in the control group (p < 0.05).

Conclusion: In CAI, PL muscle weakness is offset by the TA, RF, and GM_L muscles resulting in altered ankle strategies during gait instability. This compensation disrupts motor chains, increases movement complexity, and involves the CNS, framing CAI as a global movement issue rather than a localized problem.

Abstract Image

Abstract Image

Abstract Image

有或没有慢性踝关节不稳的个体在步态开始时下肢肌肉的协同作用。
背景:慢性踝关节不稳定(CAI)会破坏踝关节扭伤和治疗不当后的姿势稳定性。步态起始(GI)由中枢神经系统(CNS)模式控制,用于评估稳定性。肌肉协同作用反映了协调激活,揭示了神经肌肉控制。本研究调查了有和没有CAI的个体在GI期间的下肢肌肉协同作用,以了解他们的神经肌肉策略。设计:横断面研究。设置:实验室。方法:本研究纳入20名受试者,10名健康男性和10名CAI患者。根据SENIAM指南使用6个电极,并根据聚类模型设置标记。参与者在测力板上呈现听觉提示后开始步态。OpenSim使用运动学和肌肉活动数据模拟肌肉骨骼模型。在MATLAB中通过HALS分析肌肉协同作用。采用SPSS软件进行统计学检验,包括Wilcoxon和单因素方差分析。结果:健康组和CAI组之间肌肉协同效应数量无显著差异(p < 0.05)。然而,肌肉重量在协同效应1和2之间存在显著差异(p)。结论:在CAI中,前腰肌无力被TA、RF和GM_L肌肉抵消,导致步态不稳定时踝关节策略改变。这种补偿破坏了运动链,增加了运动复杂性,并涉及到中枢神经系统,将CAI视为一个全局运动问题,而不是局部问题。
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来源期刊
CiteScore
4.50
自引率
10.30%
发文量
83
审稿时长
>12 weeks
期刊介绍: Journal of Foot and Ankle Research, the official journal of the Australian Podiatry Association and The College of Podiatry (UK), is an open access journal that encompasses all aspects of policy, organisation, delivery and clinical practice related to the assessment, diagnosis, prevention and management of foot and ankle disorders. Journal of Foot and Ankle Research covers a wide range of clinical subject areas, including diabetology, paediatrics, sports medicine, gerontology and geriatrics, foot surgery, physical therapy, dermatology, wound management, radiology, biomechanics and bioengineering, orthotics and prosthetics, as well the broad areas of epidemiology, policy, organisation and delivery of services related to foot and ankle care. The journal encourages submissions from all health professionals who manage lower limb conditions, including podiatrists, nurses, physical therapists and physiotherapists, orthopaedists, manual therapists, medical specialists and general medical practitioners, as well as health service researchers concerned with foot and ankle care. The Australian Podiatry Association and the College of Podiatry (UK) have reserve funds to cover the article-processing charge for manuscripts submitted by its members. Society members can email the appropriate contact at Australian Podiatry Association or The College of Podiatry to obtain the corresponding code to enter on submission.
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