Dynamic torque during a precision grip task comparable to picking a raspberry
Dynamic torque during a precision grip task comparable to picking a raspberry
复制标题
DOI：
10.1016/j.jneumeth.2008.09.031
复制
发表时间：
2009-02-15
影响因子：
3
通讯作者：
Kolb, Florian P.
中科院分区：
文献类型：
--
作者：
Kutz, Dieter F.;Woelfel, Alexander;Kolb, Florian P.
许多研究表明，扭矩控制是一个重要的因素，在抓地力控制。这项研究介绍了一种新的任务，它允许量化的动态扭矩发展，同时增加握力在任务期间相当于采摘树莓。这项任务的性能进行了分析，在两个健康的受试者和两个小脑患者。使用最近开发的技术[Kurz DF，Woelfel A，Timmann D，Kolb FR Detection of changes in grip forces on a sliding object. J Neurosci Methods 2007：166：250-8]。杠杆和扭矩来自夹持力和夹持棒的几何特性。对该任务表现的分析提供了证据，表明健康受试者能够最小化扭矩，尽管增加了握力，而小脑患者测试的扭矩随着增加的握力不成比例地增加，由此这些高扭矩主要是由于患者无法优化杆上的单个手指位置。患者试图通过使用更高的握力来补偿他们基于共济失调的不安全感，导致不成比例的更高扭矩和不稳定性增加，于是他们再次增加握力，从而建立了一个恶性循环。这项任务的分析表明，有效的康复策略必须旨在中断这个循环。(C)2008 Elsevier B. V.版权所有
Numerous studies have shown torque control to be an important factor in grip-force control. This study introduces a novel task which allows quantification of the dynamics of torque development while increasing grip forces during a task comparable to picking a raspberry. The performance of this task was analysed in two healthy subjects and two cerebellar patients. Individual grip forces and finger positions on a grip rod were analysed using a recently developed technique [Kurz DF, Woelfel A, Timmann D, Kolb FR Detection of changes in grip forces on a sliding object. J Neurosci Methods 2007:166:250-8]. Levers and torques were derived from grip forces and geometric properties of the grip rod. The analysis of this task performance provides evidence that healthy subjects are able to minimise torque despite increasing grip force, whereas the cerebellar patients tested increased torque disproportionately with increasing grip forces, whereby these high torques were due primarily to the patients' inability to optimise individual finger positions on the rod. Patients tried to compensate their ataxia-based insecurity by employing higher grip forces, resulting in disproportionately higher torques and increased instability, whereupon they again increased grip force, thus establishing a vicious circle. The analysis of this task suggests that effective rehabilitation strategies must be aimed at interrupting this circle. (C) 2008 Elsevier B.V. All rights reserved