Mohr Maurice, Lorenzen Kristin, Palacios-Derflingher Luz, Emery Carolyn, Nigg Benno M
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Alberta, Canada; Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Alberta, Canada.
Sport Injury Prevention Research Centre, Faculty of Kinesiology, University of Calgary, Alberta, Canada.
J Electromyogr Kinesiol. 2018 Feb;38:17-27. doi: 10.1016/j.jelekin.2017.10.014. Epub 2017 Nov 6.
Despite the frequent use of the electromyography-based muscle co-contraction index (CCI) to examine muscular control of the knee joint in young adults with and without knee injury history, the reliability of the CCI in this population is unknown. The purpose of this study was to quantify within-day and between-day reliability of the knee muscle CCI during gait in young adults with and without knee injury history. Twenty young adults (10 males, 10 females) with and without history of intra-articular knee injury performed repeated gait analyses on two different days. Surface electromyography of periarticular knee muscles was performed to determine CCIs for medial and lateral knee extensor - flexor pairs. Absolute (Bland-Altman ratio limits of agreement) and relative (ICCs) reliability were determined between two sessions on the same day as well as on different days. Within-day reliability was good to excellent for most analyzed co-contraction outcomes (ICCs > 0.9) and was deemed acceptable in the context of clinically relevant changes in co-contraction in response to interventions. Between two separate days, the CCI showed poor reliability with measurement errors of up to 300% and was consequently not recommended as a tool to monitor long-term changes or group differences in knee muscular control.
尽管基于肌电图的肌肉共同收缩指数（CCI）经常被用于检查有无膝关节损伤史的年轻成年人膝关节的肌肉控制情况，但该指数在这一人群中的可靠性尚不清楚。本研究的目的是量化有无膝关节损伤史的年轻成年人在步态过程中膝关节肌肉CCI的日内和日间可靠性。20名有或无膝关节内损伤史的年轻成年人（10名男性，10名女性）在两天内进行了重复的步态分析。对膝关节周围肌肉进行表面肌电图检查，以确定膝关节内侧和外侧伸肌 - 屈肌对的CCI。在同一天以及不同日期的两次检查之间，确定了绝对（布兰德 - 奥特曼一致性界限比率）和相对（组内相关系数）可靠性。对于大多数分析的共同收缩结果，日内可靠性良好至优秀（组内相关系数>0.9），并且在共同收缩对干预措施产生临床相关变化的情况下被认为是可接受的。在两个不同的日期之间，CCI显示出较差的可靠性，测量误差高达300%，因此不建议将其作为监测膝关节肌肉控制的长期变化或组间差异的工具。
