Yang D D, Hou W S, Wu X Y, Zheng X L, Zheng J, Jiang Y T
Bioengineering Department, University of Chongqing, Chongqing, Chongqing 400030, China.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:4108-11. doi: 10.1109/IEMBS.2011.6091020.
Multitendoned extrinsic muscles of the human hand can be divided into several neuromuscular compartments (NMCs), each of which contributes to the ability of human finger to produce independent finger movements or force. The aim of this study was to investigate the changes in the spatial activation of flexor digitorum superficialis (FDS) during the fingertip force production with non-invasive multichannel surface electromyography (sEMG) technique. 7 healthy Subjects were instructed to match the target force level for 5s using individual index finger (I), individual middle finger (M) and the combination of the index and middle finger (IM) respectively. Simultaneously, a 2 × 6 electrode array was employed to record multichannel sEMG from FDS as finger force was produced. The entropy and center of gravity of the sEMG root mean square (RMS) map were computed to assess the spatial inhomogeneity in muscle activation and the change in spatial distribution of EMG amplitude related to the force generation of specific task finger. The results showed that the area and intensity of high amplitude region increased with force production, and the entropy increased with force level under the same task finger. The findings indicate that the change of spatial distribution of multitendoned extrinsic hand muscle activation is correlated to specific biomechanical functions.
人类手部的多腱外肌可分为几个神经肌肉隔室（NMCs），每个隔室都有助于人类手指产生独立的手指运动或力量。本研究的目的是使用非侵入性多通道表面肌电图（sEMG）技术，研究指浅屈肌（FDS）在指尖用力过程中空间激活的变化。7名健康受试者分别被要求用食指（I）、中指（M）以及食指和中指组合（IM）来匹配目标力水平5秒。同时，当手指用力时，使用一个2×6电极阵列记录来自FDS的多通道sEMG。计算sEMG均方根（RMS）图的熵和重心，以评估肌肉激活中的空间不均匀性以及与特定任务手指用力相关的肌电幅度空间分布变化。结果表明，高幅度区域的面积和强度随着用力增加而增加，并且在相同任务手指下熵随着力水平增加而增加。这些发现表明，多腱外手部肌肉激活的空间分布变化与特定的生物力学功能相关。
