Digit mechanics in relation to endpoint compliance during precision pinch.
Digit mechanics in relation to endpoint compliance during precision pinch.
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DOI：
10.1016/j.jbiomech.2014.12.040
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发表时间：
2015-02-26
影响因子：
2.4
通讯作者：
Li, Zong-Ming
中科院分区：
文献类型：
--
作者：
Nataraj, Raviraj;Audu, Musa L.;Li, Zong-Ming
本研究探讨拇指和食指的力学与精密捏合过程中的顺应性端点力的关系。其目的是深入了解个人如何调节运动输出的数字端点和关节根据顺应性相关的感官反馈的数字。13个健全的科目进行精确捏弹性阻力带的定制设备仪器与六度的自由负荷传感器。依从性水平根据连接的条带数量进行离散调整。向受试者提供视觉反馈以控制施力速率。在五个顺应性水平中的每一个水平下分析了15次低至中等力（<20 N）捏的重复，在此期间收集力和运动数据。关节角度和力矩由挤压力大小归一化计算。二阶多项式被用来表征关节力学作为一个功能的遵守。手指的关节自由度（DOF）表现出更大的依赖于角位置的依从性，而拇指关节自由度表现出更大的依赖于归一化的关节力矩。手指还根据顺应性调整其端点力的协调。总的来说，手指可能会改变其位置，以增加拇指关节的负荷，同时改变顺应性。这些研究结果描述了顺应性的精确捏，其中涉及运动执行响应端点的感觉反馈的手指力学自然出现的变化。识别和理解这些运动模式可以为手部感觉运动疾病的恢复和康复提供理论基础。
This study investigates the mechanics of the thumb and index finger in relation to compliant endpoint forces during precision pinch. The objective was to gain insight into how individuals modulate motor output at the digit endpoints and joints according to compliance-related sensory feedback across the digits. Thirteen able-bodied subjects performed precision pinch upon elastic resistance bands of a customized apparatus instrumented with six degree-of-freedom load-cells. Compliance levels were discretely adjusted according to the number of bands connected. Subjects were provided visual feedback to control the rate of force application. Fifteen repetitions of low-to-moderate force (<20 N) pinches were analyzed at each of five compliance levels, during which force and motion data were collected. Joint angles and moments normalized by pinch force magnitude were computed. Second-order polynomials were used to characterize joint mechanics as a function of compliance. The joint degrees-of-freedom (DOFs) at the finger showed greater dependence on compliance for angular position while the thumb joint DOFs demonstrated greater dependence for normalized joint moment. The digits also adjusted coordination of their endpoint forces according to compliance. Overall, the finger may be altering its position to increase load to the joints of the thumb with changing compliance. These findings describe naturally emergent changes in digit mechanics for compliant precision pinch, which involves motor execution in response to endpoint sensory feedback. Identifying and understanding these motor patterns may provide theoretical basis for restoring and rehabilitating sensorimotor pathologies of the hand.
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DOI：
10.5435/00124635-200906000-00007
发表时间：
2009-06
期刊：
The Journal of the American Academy of Orthopaedic Surgeons
影响因子：
--
作者：
Keith MW;Masear V;Chung K;Maupin K;Andary M;Amadio PC;Barth RW;Watters WC 3rd;Goldberg MJ;Haralson RH 3rd;Turkelson CM;Wies JL
通讯作者：
Wies JL
DOI：
10.1109/70.611319
发表时间：
1997-08-01
期刊：
IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION
影响因子：
--
作者：
Kao, I;Cutkosky, MR;Johansson, RS
通讯作者：
Johansson, RS
DOI：
10.3758/bf03213075
发表时间：
1995-05-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
TAN, HZ;DURLACH, NI;SRINIVASAN, MA
通讯作者：
SRINIVASAN, MA
影响因子：
1.4
作者：
Vigouroux, Laurent;Domalain, Mathieu;Berton, Eric
通讯作者：
Berton, Eric
影响因子：
2.8
作者：
Nataraj, Raviraj;Evans, Peter J.;Li, Zong-Ming
通讯作者：
Li, Zong-Ming