The relationship between balance control and thigh muscle strength and muscle activity in persons with incomplete spinal cord injury.

IF 0.7 Q4 CLINICAL NEUROLOGY Spinal Cord Series and Cases Pub Date : 2024-02-28 DOI:10.1038/s41394-024-00620-x
Matthijs Ferdinand Wouda, Marte Fosvold Løtveit, Espen Ingvald Bengtson, Vegard Strøm
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Abstract

Study design: Cross-sectional study.

Objectives: A spinal cord injury (SCI) can compromise the ability to maintain sufficient balance control during activities in an upraised position. The objective of the study was to explore the relationship between balance control and muscle strength and muscle activation in the lower extremities in persons with incomplete SCI (iSCI).

Setting: Sunnaas Rehabilitation Hospital, Norway.

Methods: Thirteen men and two women with iSCI and 15 healthy, matched controls were included. Performance of the Berg Balance Scale (BBS) short version (7 items) was used to indicate balance control. Maximal voluntary contraction (MVC) was performed to measure isometric muscle strength in thigh muscles (knee extension/flexion), while surface electromyography (EMG) was measured from M. Vastus Lateralis and M. Biceps Femoris. The relative activation of each muscle during each of the BBS tasks was reported as the percentage of the maximal activation during the MVC (%EMGmax).

Results: The iSCI participants had a significantly lower BBS sum score and up to 40% lower muscle strength in knee- flexion and extension compared to the matched healthy controls. They also exhibited a significantly higher %EMGmax, i.e. a higher muscle activation, during most of the balance tests. Univariate regression analysis revealed a significant association between balance control and mean values of %EMGmax in Biceps Femoris, averaged over the seven BBS tests.

Conclusions: The participants with iSCI had poorer balance control, reduced thigh muscle strength and a higher relative muscle activation in their thigh muscles, during balance-demanding activities.

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不完全脊髓损伤患者的平衡控制与大腿肌肉力量和肌肉活动之间的关系。
研究设计横断面研究:脊髓损伤(SCI)会影响在上举姿势活动时保持足够平衡控制的能力。本研究旨在探讨不完全脊髓损伤(iSCI)患者的平衡控制能力与下肢肌肉力量和肌肉激活之间的关系:研究地点:挪威松纳斯康复医院:方法:纳入 13 名男性 iSCI 患者和 2 名女性 iSCI 患者,以及 15 名健康的匹配对照者。采用伯格平衡量表(BBS)短版(7 个项目)的表现来衡量平衡控制能力。进行最大自主收缩(MVC)以测量大腿肌肉的等长肌力(膝关节伸展/屈曲),同时测量M. Vastus Lateralis和M. Biceps Femoris的表面肌电图(EMG)。在每项 BBS 任务中,每块肌肉的相对激活度以 MVC 期间最大激活度的百分比(%EMGmax)进行报告:结果:与相匹配的健康对照组相比,iSCI 参与者的 BBS 总分明显较低,膝关节屈伸肌力低达 40%。在大多数平衡测试中,他们的EMGmax%也明显较高,即肌肉活化程度较高。单变量回归分析表明,平衡控制能力与股二头肌EMGmax的平均值(七项BBS测试的平均值)之间存在显著关联:在需要平衡的活动中,iSCI 参与者的平衡控制能力较差,大腿肌肉力量减弱,大腿肌肉的相对激活程度较高。
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来源期刊
Spinal Cord Series and Cases
Spinal Cord Series and Cases Medicine-Neurology (clinical)
CiteScore
2.20
自引率
8.30%
发文量
92
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