Krebs H I, Aisen M L, Volpe B T, Hogan N
Newman Laboratory for Biomechanics and Human Rehabilitation, Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.
Proc Natl Acad Sci U S A. 1999 Apr 13;96(8):4645-9. doi: 10.1073/pnas.96.8.4645.
Segmentation of apparently continuous movement has been reported for over a century by human movement researchers, but the existence of primitive submovements has never been proved. In 20 patients recovering from a single cerebral vascular accident (stroke), we identified the apparent submovements that composed a continuous arm motion in an unloaded task. Kinematic analysis demonstrated a submovement speed profile that was invariant across patients with different brain lesions and provided experimental verification of the detailed shape of primitive submovements. The submovement shape was unaffected by its peak speed, and to test further the invariance of shape with speed, we analyzed movement behavior in a patient with myoclonus. This patient occasionally made involuntary shock-like arm movements, which occurred near the maximum capacity of the neuromuscular system, exhibited speed profiles that were comparable to those identified in stroke patients, and were also independent of speed.
一个多世纪以来，人体运动研究人员一直报告称存在对明显连续运动的分割现象，但原始子运动的存在从未得到证实。在20名从单一脑血管意外（中风）中恢复的患者中，我们识别出了在无负荷任务中构成连续手臂运动的明显子运动。运动学分析表明，子运动速度曲线在不同脑损伤患者中是不变的，并为原始子运动的详细形状提供了实验验证。子运动形状不受其峰值速度的影响，为了进一步测试形状随速度的不变性，我们分析了一名患有肌阵挛患者的运动行为。该患者偶尔会出现类似电击的非自愿手臂运动，这些运动发生在神经肌肉系统的最大能力附近，其速度曲线与中风患者中识别出的速度曲线相当，并且也与速度无关。
