Bilateral deficit and symmetry in finger force production during two-hand multifinger tasks
Bilateral deficit and symmetry in finger force production during two-hand multifinger tasks
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DOI：
10.1007/s002210100893
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发表时间：
2001-12-01
影响因子：
2
通讯作者：
Zatsiorsky, VM
中科院分区：
文献类型：
--
作者：
Li, S;Danion, F;Zatsiorsky, VM
在单手和双手多指最大力生产试验的手指力的模式进行了全面的研究，特别强调任务之间的差异，涉及对称和不对称的手指组（对称和不对称的任务）。12名健康的右利手受试者用不同的手指组合进行最大随意力产生任务。力赤字（FD）的手指组内的手被定义为下降的峰值力在多指任务相比，单个手指峰值力在单指任务的总和。FD表现出对手内手指数和另一只手手指数的依赖性。在双手测试中观察到峰值手指力的所有额外下降（双侧缺陷，BD）。两只手的BD总和与参与双手任务的手指数量无关，但取决于两只手之间手指的分布。一只手的BD对于涉及手内的手指较少而另一只手中的手指较多的任务来说较大。不对称任务的平均得分高于对称任务。不对称和对称任务之间的差异是由于不对称参与手指的不同行为。FD是较大的不对称的主（明确参与）的手指，而不对称的奴隶（明确不参与）的手指不自觉地产生的力量较大。这些差异降低了双手在额面产生的总力矩。FD和BD是不同起源的现象，它们的影响可以相加。这些观察结果进一步发展了先前提出的双表示镜像（DoReMi）假设，并改进了双手手指交互的神经网络。
A comprehensive study of patterns of finger forces during one-hand and two-hand multifinger maximal force production trials was performed with particular emphasis on differences between tasks involving symmetrical and asymmetrical finger groups (symmetrical and asymmetrical tasks). Twelve healthy right-handed subjects performed maximal voluntary force production tasks with different finger combinations. Force deficit (FD) for a finger group within a hand was defined as a drop in peak force in a multifinger task as compared to the sum of individual Finger peak forces in single-finger tasks. FD showed a dependence on both the number of fingers within the hand and the number of fingers in the other hand. Ali additional drop in peak Finger forces was seen in two-hand tests (bilateral deficit, BD). BD summed over two hands was independent of the number of fingers involved in the two-hand tasks, but dependent on the distribution of Fingers between the two hands. BD for a hand was larger for tasks involving fewer fingers within the hand and more Fingers in the other hand. It was higher for asymmetrical tasks than for symmetrical tasks. The difference between asymmetrical and symmetrical tasks was due to the different behavior of asymmetrically involved fingers. FD was larger for asymmetrical master (explicitly involved) fingers, while forces produced involuntarily by asymmetrical slave (explicitly non-involved) fingers were larger. These differences brought down the total moment produced by both hands in the frontal plane. FD and BD are phenomena of different origin whose effects sum up. The observations have led to further development of a previously proposed double-representation, mirror-image (DoReMi) hypothesis and refinement of the neural network underlying the two-hand finger interaction.