Reaching and grasping are often completed while walking, yet the interlimb coordination required for such a combined task is not fully understood. Previous studies have produced contradictory evidence regarding preference for support of the lower limb ipsilateral or contralateral to the upper limb when performing a reaching task. This coordinative aspect of the combined task provides insight into whether the two tasks are mutually modified or if the reach is superimposed upon normal arm swinging. Collectively, 18 right-handed young adults walked slower, took shorter steps, and spent more time in double support during the combined task compared with walking alone. The peak grasp aperture was larger in walking reach-to-grasp trials compared with standing trials. There was not a strong trend for lower limb support preferences at the reach initiation or object contact. The participants could begin walking with either foot and demonstrated variability of preferred gait initiation patterns. There was a range of interlimb coordination patterns, none of which could be generalized to all young adults. The variability with which healthy right-handed young adults execute a combined walking reach-to-grasp task suggests that the cyclical (walking) and discrete (prehension) motor tasks may have separate motor control mechanisms, as proposed in the two primitives theory.

中文翻译：

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步态和感觉综合任务期间的肢体协调。

步行过程中通常会完成伸手和抓地力，但对于这种组合任务所需的肢体协调并没有完全了解。先前的研究产生了相互矛盾的证据，这些证据表明在执行伸手任务时偏爱下肢同侧或对侧上肢的支持。组合任务的这一协调方面使您可以深入了解这两个任务是否相互修改，或者在常规手臂摆动时是否将覆盖范围重叠。与单独走路相比，总共有18位右撇子青年行走速度较慢，步伐较短，在双重支撑下花费的时间更多。与站立试验相比，步行可达抓握试验的峰值抓握孔径更大。在伸手开始或与物体接触时，下肢支持偏爱的趋势并不强烈。参与者可以开始用任一只脚走路，并证明首选步态起始模式的可变性。有各种各样的跨行协调模式，没有一种可以推广到所有年轻人。健康的惯用右手的年轻人执行步行触手可及的组合任务的可变性表明，周期性（步行）和离散（领悟）运动任务可能具有独立的运动控制机制，这是两种原始理论所提出的。