Can activities of daily living contribute to EMG normalization for gait analysis?
Can activities of daily living contribute to EMG normalization for gait analysis?
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DOI：
10.1371/journal.pone.0174670
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Whatling GM
中科院分区：
文献类型：
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作者：
Ghazwan A;Forrest SM;Holt CA;Whatling GM
本研究旨在检验与最大自愿收缩(MVC)相比，有效反映肌肉活动的可选的正常化方法。采用不同的归一化方法：步态周期的MVC、均值和峰值动态(分别为MDM和PDM)、日常生活活动的峰值动态(ADLS)、(*PDM)以及ADLS和MVC的组合(**PDM)，对10名对照组受试者在步态周期站立阶段记录的膝关节屈伸肌肌电数据进行了分析。计算个体内和个体间的变异性，以确定与MCV的可靠性和相似性。与MVC相比，**PDM在受试者中表现出极好的可靠性，其变异率范围为**PDM的0.43-0.99和MVC的0.79-1.08。变异系数的变化趋势与变异比相似，**产品数据的变异系数在0.60-1.25之间，MVC的变异系数在1.97-3.92之间。MVC和**Pdm以及在一定程度上*Pdm的相对幅度匹配良好，即股内侧肌的均方根差和绝对差值均在0.08左右，腓肠肌内侧的均方根差和绝对差值均在4左右。结论是**产品数据管理和*产品数据管理是可靠的，**产品数据管理是MVC的镜像，因此对于不能提供所需努力进行MVC测试的受试者来说，可以作为MVC的替代品。在无法进行MVC测试的情况下，*pdm是下一个首选选项。
This study aims to examine alternative methods of normalization that effectively reflect muscle activity as compared to Maximal Voluntary Contraction (MVC). EMG data recorded from knee flexion-extension muscles in 10 control subjects during the stance phase of the gait cycle were examined by adopting different approaches of normalization: MVC, Mean and Peak Dynamic during gait cycles, (MDM and PDM, respectively), Peak Dynamic during activities of daily living (ADLs), (*PDM), and a combination of ADLs and MVC(**PDM). Intra- and inter-individual variability were calculated to determine reliability and similarity to MCV. **PDM showed excellent reliability across subjects in comparison to MVC, where variance ratio ranged from 0.43–0.99 for **PDM and 0.79–1.08 for MVC. Coefficient of variability showed a similar trend to Variance Ratio, ranging from 0.60–1.25 for **PDM and 1.97–3.92 for MVC. Both MVC and **PDM, and to some extent *PDM, demonstrated good-to-excellent relative amplitude’s matching; i.e. root mean square difference and absolute difference were both around 0.08 for Vastus medialis to about 4 for Medial gastrocnemius. It was concluded that **PDM and *PDM were reliable, **PDM mirrored MVC and thus could be used as an alternative to MVC for subjects who are unable to provide the required effort for MVC testing. Where MVC testing is not possible, *PDM is the next preferred option.