Increased fall risk is associated with elevated co-contraction about the ankle during static balance challenges in older adults
Increased fall risk is associated with elevated co-contraction about the ankle during static balance challenges in older adults
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DOI：
10.1007/s00421-011-2094-x
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发表时间：
2012-04-01
影响因子：
3
通讯作者：
Walker, Mark
中科院分区：
文献类型：
--
作者：
Nelson-Wong, Erika;Appell, Ryan;Walker, Mark
跌倒是导致老年人残疾的主要原因。在静态和动态平衡挑战中，下肢肌肉协同收缩增加与年龄和跌倒史有关。在静态平衡挑战期间的协同收缩以前并没有与旨在确定跌倒风险的临床测试的表现联系在一起。本研究的目的是在常用的动态平衡测试(FSST)中，研究在静态平衡挑战中踝关节的协同收缩与跌倒风险之间的关系。23名志愿者(平均年龄73岁)进行了一系列的5个静态平衡挑战(Romberg眼睛睁/闭、锐化Romberg眼睛睁/闭、单腿站立)，并进行了双侧胫前肌和腓肠肌的连续肌电(EMG)检查。然后，参与者完成FSST，并根据12 S的截止时间将跌倒的危险或非危险分类。共收缩指数(CCI)定量。窄基础条件下的CCI与完成FSST的时间呈正相关。根据FSST时间，除Romberg闭眼站立外，在所有静态平衡挑战中，CCI高预测有摔倒的风险，优势比为19.3。作者的结论是，在静态平衡挑战中，脚踝的协同收缩可以预测动态平衡测试的表现。
Falls are a leading contributor to disability in older adults. Increased muscle co-contraction in the lower extremities during static and dynamic balance challenges has been associated with aging, and also with a history of falling. Co-contraction during static balance challenges has not been previously linked with performance on clinical tests designed to ascertain fall risk. The purpose of this study was to investigate the relationship between co-contraction about the ankle during static balance challenges with fall risk on a commonly used dynamic balance assessment, the Four Square Step Test (FSST). Twenty-three volunteers (mean age 73 years) performed a series of five static balance challenges (Romberg eyes open/closed, Sharpened Romberg eyes open/closed, and Single Leg Standing) with continuous electromyography (EMG) of bilateral tibialis anterior and gastrocnemius muscles. Participants then completed the FSST and were categorized as 'at-risk' or 'not-at-risk' to fall based on a cutoff time of 12 s. Co-contraction was quantified with co-contraction index (CCI). CCI during narrow base conditions was positively correlated with time to complete FSST. High CCIs during all static balance challenges with the exception of Romberg stance with eyes closed were predictive of being at-risk to fall based on FSST time, odds ratio 19.3. The authors conclude that co-contraction about the ankle during static balance challenges can be predictive of performance on a dynamic balance test.