Manipulabilities of the index finger and thumb in three tip-pinch postures
Manipulabilities of the index finger and thumb in three tip-pinch postures
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DOI：
10.1115/1.1691444
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发表时间：
2004-04-01
影响因子：
1.7
通讯作者：
Hara, K
中科院分区：
文献类型：
--
作者：
Yokogawa, R;Hara, K
指尖捏指的是食指和拇指的指尖拿起并握住一个非常精细的物体，在手的功能中起着重要的作用。本研究的目的是调查人类受试者在三种不同的指尖捏捏姿势下如何影响食指和拇指指尖在手指屈伸平面内的可操控性。基于两种三维位置测量装置测量结果，将20名男性受试者的食指和拇指建模为连杆结构。采用三种标准表示连杆模型可操作椭圆的形式和姿态，研究了三种指尖捏捏姿势下食指和拇指的可操作性。除拇指两项指标外，受试者各手指各指标均无显著差异（p < 0.05，方差分析）。在所有受试者的指尖捏捏姿势中，食指和拇指的可操控性分别是相似的。结果发现，所有被试在指尖捏捏动作中，食指和拇指配合的可操控性依赖于食指的姿势，而不依赖于拇指的姿势。在二维指尖按压中，有可能食指主动工作，而拇指被动工作，以支持食指的操作。
Tip-pinch, in which the tips of the index finger and thumb pick up and hold a very fine object, plays an important role in the function of the hand. The objective of this study was to investigate how human subjects affect manipulabilities of the tips of the index finger and thumb within the flexion/extension plane of the finger in three different tip-pinch postures. The index finger and thumb of twenty male subjects were modeled as linkages, based on measurement results obtained using two three-dimensional position measurement devices. The manipulabilities of the index finger and thumb were investigated in three tip-pinch postures, using three criteria indicating the form and posture of the manipulability ellipse of the linkage model. There were no significant differences (p>0.05, ANOVA) in each criterion of each digit across the subjects, except,for two criteria of the thumb. The manipulabilities of the index finger and thumb were separately similar across all subjects in tip-pinch postures. It was found that the manipulability for the cooperation of the index finger and thumb of all the subjects in tip-pinch depended on the posture of the index finger, but not on the posture of the thumb. In two-dimensional tip-pinch, it was possible that the index finger worked actively while the thumb worked passively to support the manipulation of the index finger.