Handedness: Dominant arm advantages in control of limb dynamics
Handedness: Dominant arm advantages in control of limb dynamics
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DOI：
10.1152/jn.00901.2001
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发表时间：
2002-11-01
影响因子：
2.5
通讯作者：
Sainburg, RL
中科院分区：
文献类型：
--
作者：
Bagesteiro, LB;Sainburg, RL
我们实验室最近的研究结果表明，区分优势臂和非优势臂的一个主要因素是中枢神经系统控制节段间动力学效应的能力。这些研究表明，优势臂可靠地使用更多的扭矩效率模式，以类似的速度和准确性比非优势臂运动的运动。然而，非优势手路径曲率系统地变化的幅度之间的相互作用扭矩转移的运动肢体的部分，优势手路径曲率没有。然而，我们以前的研究并没有区分是否优势臂协调优势出现更有效的控制动力因素，或只是一个次要的影响，规划不同的运动。本研究的目的是进一步调查肢体间的协调差异，通过分析逆动力学和肌电图记录在性能的达到运动。在本研究中，通过控制节段间动力学的幅度，我们能够评估是否存在系统的扭矩效率差异，即使手路径形状的差异是最小的。受试者的手臂由无摩擦空气喷射系统支撑在水平面上，并被限制在肩关节和肘关节周围运动。设计了两个目标，使得手肘引起的相互作用扭矩或大或小。我们的研究结果表明，前者产生了很大的差异，手路径曲率，而后者没有。此外，手路径运动学的小差异的运动表现出很大的差异，在扭矩模式和相应的EMG配置文件，这意味着一个更扭矩有效的策略占主导地位的arm.In鉴于这些研究结果，我们建议，不同的神经控制机制，占主导地位的和非主导的手臂动作。
Recent findings from our laboratory suggest that a major factor distinguishing dominant from nondominant arm performance is the ability by which the effects of intersegmental dynamics are controlled by the CNS. These studies indicated that the dominant arm reliably used more torque-efficient patterns for movements made with similar speeds and accuracy than nondominant arm movements. Whereas, nondominant hand-path curvatures systematically varied with the amplitude of the interaction torques transferred between the segments of the moving limb, dominant hand-path curvatures did not. However, our previous studies did not distinguish whether dominant arm coordination advantages emerged from more effective control of dynamic factors or were simply a secondary effect of planning different kinematics. The purpose of this study was to further investigate interlimb differences in coordination through analysis of inverse dynamics and electromyography recorded during the performance of reaching movements. By controlling the amplitude of intersegmental dynamics in the current study, we were able to assess whether systematic differences in torque-efficiency exist, even when differences in hand-path shape were minimal. Subject's arms were supported in the horizontal plane by a frictionless air-jet system and were constrained to movements about the shoulder and elbow joints. Two targets were designed, such that the interaction torques elicited at the elbow were either large or small. Our results showed that the former produced large differences in hand-path curvature, whereas the latter did not. Additionally, the movements with small differences in hand-path kinematics showed substantial differences in torque patterns and corresponding EMG profiles which implied a more torque-efficient strategy for the dominant arm. In view of these findings we propose that distinct neural control mechanisms are employed for dominant and nondominant arm movements.