Institute of Biomedical Engineering, University of Science and Technology of China, Hefei, China Sensory Motor Performance Program, Rehabilitation Institute of Chicago, Chicago, Illinois, USA Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, Illinois, USA.
Top Stroke Rehabil. 2013 Nov-Dec;20(6):537-44. doi: 10.1310/tsr2006-537.
This study examines the electromyogram (EMG)-force relations observed in the first dorsal interosseous (FDI) muscle of hemiparetic stroke survivors.
Fourteen stroke subjects were instructed to perform different levels of index finger abduction using their paretic and contralateral hands, respectively. Surface EMG and force signals were recorded from the FDI muscle. The EMG-force relation was constructed using linear regression of the EMG amplitude and force measurements.
We found that there were diverse changes in the slope of the EMG-force relations in paretic muscles compared with contralateral muscles, with significant increases and decreases being observed relative to the contralateral side. Regression analysis did not verify strong correlations between the ratio of paretic and contralateral muscle EMG-force slopes and any clinical parameters.
These findings suggest that there appear to be different types of processes (eg, motor unit control property changes, muscle fiber atrophy, spinal motoneuron degeneration, muscle fiber reinnervation, etc) at work post stroke that may impact the EMG-force relations and that may be present in varying degree in any given stroke survivor.
本研究观察了偏瘫脑卒中幸存者第一背侧骨间（FDI）肌肉中的肌电图（EMG）-力关系。
分别指导 14 名脑卒中受试者用瘫痪侧和健侧手进行不同程度的食指外展运动。从 FDI 肌肉记录表面肌电图和力信号。使用 EMG 幅度和力测量的线性回归构建 EMG-力关系。
我们发现，与健侧肌肉相比，瘫痪肌肉的 EMG-力关系斜率存在多种变化，与健侧相比，明显增加和减少。回归分析并未证实瘫痪侧和健侧肌肉 EMG-力斜率比与任何临床参数之间存在很强的相关性。
这些发现表明，脑卒中后似乎存在不同类型的过程（例如运动单位控制特性变化、肌肉纤维萎缩、脊髓运动神经元变性、肌肉纤维再支配等），这些过程可能会影响 EMG-力关系，并且在任何给定的脑卒中幸存者中可能以不同程度存在。
