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首页> 外文期刊>Journal of Neurophysiology >Modulation of phase durations, Phase variations, And temporal coordination of the four limbs during quadrupedal split-belt locomotion in intact adult cats
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Modulation of phase durations, Phase variations, And temporal coordination of the four limbs during quadrupedal split-belt locomotion in intact adult cats

机译：在成年猫的四足运动中，四肢劈开皮带运动过程中相位持续时间，相位变化和四个肢体的时间协调性的调节

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Stepping along curvilinear paths produces speed differences between the inner and outer limb(s). This can be reproduced experimentally by independently controlling left and right speeds with split-belt locomotion. Here we provide additional details on the pattern of the four limbs during quadrupedal split-belt locomotion in intact cats. Six cats performed tied-belt locomotion (same speed bilaterally) and split-belt locomotion where one side (constant side) stepped at constant treadmill speed while the other side (varying side) stepped at several speeds. Cycle, stance, and swing durations changed in parallel in homolateral limbs with shorter and longer stance and swing durations on the fast side, respectively, compared with the slow side. Phase variations were quantified in all four limbs by measuring the slopes of the regressions between stance and cycle durations (rSTA) and between swing and cycle durations (rSW). For a given limb, rSTA and rSW were not significantly different from one another on the constant side whereas on the varying side rSTA increased relative to tied-belt locomotion while rSW became more negative. Phase variations were similar for homolateral limbs. Increasing left-right speed differences produced a large increase in homolateral double support on the slow side, while triple-support periods decreased. Increasing left-right speed differences altered homologous coupling, homolateral coupling on the fast side, and coupling between the fast hindlimb and slow forelimb. Results indicate that homolateral limbs share similar control strategies, only certain features of the interlimb pattern adjust, and spinal locomotor networks of the left and right sides are organized symmetrically.
机译：沿着曲线路径步进会在内侧和外侧肢之间产生速度差异。可以通过分开皮带运动独立控制左，右速度来通过实验重现这一点。在这里，我们提供了完整猫的四足带劈开运动中四个肢体模式的更多详细信息。六只猫进行束带运动（双向相同速度）和分开带运动，其中一侧（恒定侧）以恒定的跑步机速度步进，而另一侧（恒定侧）以几种速度步进。与慢侧相比，同侧肢体的周期，姿势和挥杆持续时间平行变化，在快侧分别具有较短和较长的姿势和挥杆持续时间。通过测量姿势和周期持续时间（rSTA）之间以及挥杆和周期持续时间（rSW）之间的回归斜率来量化所有四个肢体的相位变化。对于给定的肢体，在恒定侧，rSTA和rSW彼此之间无显着差异，而在变化侧，rSTA相对于绑带运动增加，而rSW变得更负。同侧肢体的相变相似。左右速度差的增加在慢侧产生了较大的同侧双支撑，而三支撑周期减少了。左右速度差异的增加改变了同源耦合，快速侧的同侧耦合以及快速后肢与慢前肢之间的耦合。结果表明，同侧肢体共享相似的控制策略，仅调整了肢体模式的某些特征，左右两侧的脊柱运动网络对称地组织。

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