Lateef Shabnam, Lanza Marcel Bahia, Gray Vicki L
Department of Physical Therapy & Rehabilitation Science, University of Maryland, Baltimore, USA.
Department of Physical Therapy & Rehabilitation Science, University of Maryland, Baltimore, USA.
J Electromyogr Kinesiol. 2025 Jun;82:103003. doi: 10.1016/j.jelekin.2025.103003. Epub 2025 Mar 26.
People with chronic stroke (PwCS) suffer from impaired lateral weight transfer, resulting in a loss of balance. The primary purpose of this study was to examine how stroke impairs the rate of hip abductor-adductor muscle activation during weight transfer compared to controls, and whether this influences subsequent stepping performance. The secondary purpose was to determine how stroke affects bilateral coordinated hip abductor-adductor muscle activity between the step and stance legs. 20 PwCS (61.6 ± 7.4 years, 4F/16 M) and 10 healthy controls (64.8 ± 8.9 years, 5F/5M) were included. Participants took a voluntary lateral step, as quickly as possible, in response to a light cue. Bilateral Adductor Longus (ADD) and Gluteus Medius (GM) rate of muscle activation (RoA) were measured using electromyography, and spatiotemporal step characteristics were measured using motion capture. Paretic (p < 0.01) and non-paretic (p < 0.01) stance and step legs had a reduced GM and ADD RoA during weight transfer compared to controls. Reduced stance and step GM and ADD RoA were associated with longer weight transfer and step initiation times (r = - 0.47 to - 0.63, p < 0.001). PwCS had a lack of bilateral coordinated GM and ADD activity (p > 0.05). Post-stroke reductions in GM and ADD RoA contribute to altered step characteristics.
慢性中风患者（PwCS）存在侧向体重转移受损的情况，导致平衡能力丧失。本研究的主要目的是研究与对照组相比，中风如何影响体重转移过程中髋外展肌 - 内收肌的激活速率，以及这是否会影响后续的迈步表现。次要目的是确定中风如何影响迈步腿和站立腿之间双侧协调的髋外展肌 - 内收肌活动。纳入了20名慢性中风患者（61.6 ± 7.4岁，4名女性/16名男性）和10名健康对照者（64.8 ± 8.9岁，5名女性/5名男性）。参与者根据轻微提示尽可能快地进行一次自主侧向迈步。使用肌电图测量双侧内收长肌（ADD）和臀中肌（GM）的肌肉激活速率（RoA），并使用动作捕捉测量时空迈步特征。与对照组相比，患侧（p < 0.01）和非患侧（p < 0.01）的站立腿和迈步腿在体重转移过程中GM和ADD的RoA降低。站立腿和迈步腿GM和ADD的RoA降低与更长的体重转移和迈步起始时间相关（r = -0.47至-0.63，p < 0.001）。慢性中风患者缺乏双侧协调的GM和ADD活动（p > 0.05）。中风后GM和ADD的RoA降低导致迈步特征改变。
