Velocity-dependent transfer of adaptation in human running as revealed by split-belt treadmill adaptation
Velocity-dependent transfer of adaptation in human running as revealed by split-belt treadmill adaptation
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DOI：
10.1007/s00221-018-5195-5
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发表时间：
2018-04-01
影响因子：
2
通讯作者：
Nakazawa, Kimitaka
中科院分区：
文献类型：
--
作者：
Ogawa, Tetsuya;Obata, Hiroki;Nakazawa, Kimitaka
动物研究表明，运动背后的神经机制是特定于运动模式和/或速度的。与动物的结果一致，人类运动适应研究，特别是那些专注于行走的研究，揭示了在运动环境（包括不同的运动速度）中适应的有限转移。跑步是人类在日常生活中使用的另一种常见步态，在潜在的神经机制方面与步行不同。本研究采用裂带跑步机的适应范式来考察神经机制在不同跑步速度下可能存在的独立性。从分带跑步中学习到的适应性导致了与速度相关的程度不同的后遗症。在地面反作用力的两个分量中，前制动分量和后推进分量表现出不同的变化趋势。与后推进部件相比，前制动部件在先前经历的劈裂带较慢侧速附近的速度下往往表现出更大的后效应，而后推进部件在劈裂带较快侧速对应的速度下，后效应大小往往最大。这些结果表明，人类不同跑步速度背后的神经机制可能是独立的，就像人类行走和动物研究一样。
Animal studies demonstrate that the neural mechanisms underlying locomotion are specific to the modes and/or speeds of locomotion. In line with animal results, human locomotor adaptation studies, particularly those focusing on walking, have revealed limited transfers of adaptation among movement contexts including different locomotion speeds. Running is another common gait that humans utilize in their daily lives and is distinct from walking in terms of the underlying neural mechanisms. The present study employed an adaptation paradigm on a split-belt treadmill to examine the possible independence of neural mechanisms mediating different running speeds. The adaptations learned with split-belt running resulted in aftereffects with magnitudes that varied in a speed-dependent matter. In the two components of the ground reaction force investigated, the anterior braking and posterior propulsive components exhibited different trends. The anterior braking component tended to show larger aftereffect under speeds near the slower side speed of the previously experienced split-belt in contrast to the posterior propulsive component in which the aftereffect size tended to be the largest at a speed that corresponded to the faster side speed of the split-belt. These results show that the neural mechanisms underlying different running speeds in humans may be independent, just as in human walking and animal studies.