Closed-Loop Reflex Responses of the Lateral Ankle Musculature From Various Thresholds During a Lateral Ankle Sprain Perturbation.

IF 1.3 4区 医学 Q3 REHABILITATION Journal of Sport Rehabilitation Pub Date : 2024-01-10 Print Date: 2024-03-01 DOI:10.1123/jsr.2023-0336
Jeffrey D Simpson, Ludmila Cosio Lima, Youngil Lee, Harish Chander, Adam C Knight
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Abstract

Context: Latency is a reliable temporal metric used to evaluate sensorimotor integration of the fibularis longus (FL) and fibularis brevis (FB) during lateral ankle sprain perturbations. Currently, no clinical recommendations exist to select appropriate thresholds to evaluate the closed-loop reflex response of the lateral ankle musculature. The purpose of this study was to assess threshold value on latency of the FL and FB during an unanticipated inversion perturbation that simulates the mechanism of a lateral ankle sprain.

Design: Descriptive laboratory study.

Methods: Twenty healthy adults with no history of lateral ankle sprain injury completed an unanticipated single-leg drop landing onto a 25° laterally inclined force platform from a height of 30 cm. Surface electromyography recorded muscle activity data from the FL and FB during the inversion perturbation. Latency was identified at points where muscle activity exceeded 2, 5, and 10 SD above the average muscle activity 200 milliseconds prior to foot contact, and compared across threshold value using a 1-way analysis of variance (P < .05).

Results: The 2 SD threshold was significantly shorter than both 5 SD and 10 SD thresholds for the FL (P < .01) and FB (P < .01). Likewise, the 5 SD threshold was significantly shorter than the 10 SD thresholds for FL (P = .004) and FB (P = .003).

Conclusions: More sensitive thresholds results in a shorter closed-loop reflexive response compared to the more rigorous thresholds. We recommend that selection of the appropriate threshold to identify latency of the lateral ankle musculature should be based on the device used to simulate a lateral ankle sprain and the ankle inversion velocity produced during the ankle inversion perturbation.

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踝关节外侧扭伤扰动时,踝关节外侧肌肉在不同阈值下的闭环反射反应。
背景:在外侧踝关节扭伤扰动时,延迟是用于评估腓骨长肌(FL)和腓骨短肌(FB)感觉运动整合的可靠时间指标。目前,还没有临床建议来选择适当的阈值来评估外侧踝关节肌肉的闭环反射反应。本研究的目的是评估在模拟外侧踝关节扭伤机制的意外反向扰动时 FL 和 FB 潜伏期的阈值:设计:描述性实验室研究:方法:20 名无外侧踝关节扭伤史的健康成年人从 30 厘米高的 25° 横向倾斜力平台上完成意外的单腿下落着陆。在反向扰动过程中,表面肌电图记录了 FL 和 FB 的肌肉活动数据。在脚接触前 200 毫秒,肌肉活动超过平均肌肉活动 2、5 和 10 SD 的点确定潜伏期,并使用单因素方差分析比较不同阈值(P < .05):结果:FL(P < .01)和 FB(P < .01)的 2 SD 阈值明显短于 5 SD 和 10 SD 阈值。同样,对于 FL(P = .004)和 FB(P = .003),5 SD阈值明显短于 10 SD阈值:结论:与更严格的阈值相比,更敏感的阈值会导致更短的闭环反射反应。我们建议,应根据用于模拟外侧踝关节扭伤的设备和踝关节内翻扰动时产生的踝关节内翻速度来选择合适的阈值以识别外侧踝关节肌肉的潜伏期。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Sport Rehabilitation
Journal of Sport Rehabilitation 医学-康复医学
CiteScore
3.20
自引率
5.90%
发文量
143
审稿时长
>12 weeks
期刊介绍: The Journal of Sport Rehabilitation (JSR) is your source for the latest peer-reviewed research in the field of sport rehabilitation. All members of the sports-medicine team will benefit from the wealth of important information in each issue. JSR is completely devoted to the rehabilitation of sport and exercise injuries, regardless of the age, gender, sport ability, level of fitness, or health status of the participant. JSR publishes peer-reviewed original research, systematic reviews/meta-analyses, critically appraised topics (CATs), case studies/series, and technical reports that directly affect the management and rehabilitation of injuries incurred during sport-related activities, irrespective of the individual’s age, gender, sport ability, level of fitness, or health status. The journal is intended to provide an international, multidisciplinary forum to serve the needs of all members of the sports medicine team, including athletic trainers/therapists, sport physical therapists/physiotherapists, sports medicine physicians, and other health care and medical professionals.
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