Decreasing postural stability after trunk perturbation is related to altered muscle activity in patients with chronic ankle instability

IF 2.9 3区医学 Q3 BIOPHYSICS

Journal of biomechanics Pub Date : 2026-09-01 Epub Date: 2026-08-13 DOI:10.1016/j.jbiomech.2026.113524

Shinshiro Mineta, Minori Mitsui, Takashi Sudo, Tomoki Ebato

{"title":"Decreasing postural stability after trunk perturbation is related to altered muscle activity in patients with chronic ankle instability","authors":"Shinshiro Mineta, Minori Mitsui, Takashi Sudo, Tomoki Ebato","doi":"10.1016/j.jbiomech.2026.113524","DOIUrl":null,"url":null,"abstract":"<div><div>Approximately 47% of lateral ankle sprains (LASs) occur via indirect contact; therefore, clarifying postural control after external contact to the trunk may provide valuable insights into LAS prevention. In the present study, kinematics, kinetics, and muscle activity were measured during a stepping task following trunk perturbation. Kinematics and muscle activity were analyzed before and after both perturbation and initial contact (IC), whereas kinetics were analyzed only before and after IC. The anterior–posterior stability index, medial–lateral stability index (MLSI), and maximum lateral center of pressure (COP) displacement were calculated as stability outcomes. Co-contraction indices (CCIs) were calculated to assess muscle coactivation. Group differences were analyzed using independent t-tests, Mann–Whitney U tests, or statistical parametric mapping for time-series data. Relationships between stability outcomes and muscle activity were examined using multiple regression analysis. The CAI group exhibited significantly higher MLSI and COP lateral displacement, and significantly lower tibialis anterior (TA)/TA + gastrocnemius medialis (GasM) and TA/TA + gastrocnemius lateralis (GasL) co-contraction indices. The analyses revealed several significant group differences and associations. GasM root mean square (RMS) before IC was also significantly higher. Increased MLSI was associated with delayed peroneus longus (PL) onset; COP displacement was related to PL/PL + TA CCI, PL RMS before IC, and delayed GasL onset. These findings indicate that individuals with CAI exhibit impaired postural stability during post-perturbation stepping responses following external contact to the trunk, accompanied by altered ankle muscle activation. Perturbation-based training targeting foot stability and coordinated ankle muscle activation may be important for LAS prevention and rehabilitation.</div></div>","PeriodicalId":15168,"journal":{"name":"Journal of biomechanics","volume":"206 ","pages":"Article 113524"},"PeriodicalIF":2.9000,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of biomechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0021929026003799","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/8/13 0:00:00","PubModel":"Epub","JCR":"Q3","JCRName":"BIOPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

Approximately 47% of lateral ankle sprains (LASs) occur via indirect contact; therefore, clarifying postural control after external contact to the trunk may provide valuable insights into LAS prevention. In the present study, kinematics, kinetics, and muscle activity were measured during a stepping task following trunk perturbation. Kinematics and muscle activity were analyzed before and after both perturbation and initial contact (IC), whereas kinetics were analyzed only before and after IC. The anterior–posterior stability index, medial–lateral stability index (MLSI), and maximum lateral center of pressure (COP) displacement were calculated as stability outcomes. Co-contraction indices (CCIs) were calculated to assess muscle coactivation. Group differences were analyzed using independent t-tests, Mann–Whitney U tests, or statistical parametric mapping for time-series data. Relationships between stability outcomes and muscle activity were examined using multiple regression analysis. The CAI group exhibited significantly higher MLSI and COP lateral displacement, and significantly lower tibialis anterior (TA)/TA + gastrocnemius medialis (GasM) and TA/TA + gastrocnemius lateralis (GasL) co-contraction indices. The analyses revealed several significant group differences and associations. GasM root mean square (RMS) before IC was also significantly higher. Increased MLSI was associated with delayed peroneus longus (PL) onset; COP displacement was related to PL/PL + TA CCI, PL RMS before IC, and delayed GasL onset. These findings indicate that individuals with CAI exhibit impaired postural stability during post-perturbation stepping responses following external contact to the trunk, accompanied by altered ankle muscle activation. Perturbation-based training targeting foot stability and coordinated ankle muscle activation may be important for LAS prevention and rehabilitation.

查看原文本刊更多论文

慢性踝关节不稳定患者躯干扰动后姿势稳定性下降与肌肉活动改变有关。

大约47%的踝关节外侧扭伤（LASs）是通过间接接触发生的；因此，澄清外部接触躯干后的姿势控制可能为LAS的预防提供有价值的见解。在本研究中，运动学、动力学和肌肉活动在躯干扰动后的步进任务中被测量。分析了扰动和初始接触（IC）前后的运动学和肌肉活动，而仅分析了IC前后的动力学。计算了前后稳定指数、内侧-外侧稳定指数（MLSI）和最大外侧压力中心（COP）位移作为稳定性结果。计算共收缩指数（CCIs）来评估肌肉共激活。采用独立t检验、Mann-Whitney U检验或时间序列数据的统计参数映射分析组间差异。使用多元回归分析检验稳定性结果与肌肉活动之间的关系。CAI组MLSI和COP外侧位移显著升高，胫前肌(TA)/TA +腓肠肌内侧肌（GasM）和TA/TA +腓肠肌外侧肌（GasL）联合收缩指数显著降低。分析揭示了几个显著的群体差异和关联。IC前GasM均方根（RMS）也显著升高。MLSI增加与腓骨长肌（PL）发病延迟有关；COP位移与PL/PL + TA CCI、IC前PL RMS和延迟GasL发作有关。这些研究结果表明，CAI患者在外部接触躯干后的扰动步进反应中表现出姿势稳定性受损，并伴有踝关节肌肉激活的改变。以足部稳定性和协调踝关节肌肉激活为目标的基于扰动的训练可能对LAS的预防和康复很重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of biomechanics 生物-工程：生物医学

CiteScore

5.10

自引率

4.20%

发文量

345

审稿时长

1 months

期刊介绍： The Journal of Biomechanics publishes reports of original and substantial findings using the principles of mechanics to explore biological problems. Analytical, as well as experimental papers may be submitted, and the journal accepts original articles, surveys and perspective articles (usually by Editorial invitation only), book reviews and letters to the Editor. The criteria for acceptance of manuscripts include excellence, novelty, significance, clarity, conciseness and interest to the readership. Papers published in the journal may cover a wide range of topics in biomechanics, including, but not limited to: -Fundamental Topics - Biomechanics of the musculoskeletal, cardiovascular, and respiratory systems, mechanics of hard and soft tissues, biofluid mechanics, mechanics of prostheses and implant-tissue interfaces, mechanics of cells. -Cardiovascular and Respiratory Biomechanics - Mechanics of blood-flow, air-flow, mechanics of the soft tissues, flow-tissue or flow-prosthesis interactions. -Cell Biomechanics - Biomechanic analyses of cells, membranes and sub-cellular structures; the relationship of the mechanical environment to cell and tissue response. -Dental Biomechanics - Design and analysis of dental tissues and prostheses, mechanics of chewing. -Functional Tissue Engineering - The role of biomechanical factors in engineered tissue replacements and regenerative medicine. -Injury Biomechanics - Mechanics of impact and trauma, dynamics of man-machine interaction. -Molecular Biomechanics - Mechanical analyses of biomolecules. -Orthopedic Biomechanics - Mechanics of fracture and fracture fixation, mechanics of implants and implant fixation, mechanics of bones and joints, wear of natural and artificial joints. -Rehabilitation Biomechanics - Analyses of gait, mechanics of prosthetics and orthotics. -Sports Biomechanics - Mechanical analyses of sports performance.