Zanetti Carlo, Schieppati Marco
Dipartimento di Medicina Sperimentale, Sezione di Fisiologia Umana, Università di Pavia, Pavia, Italy.
Eur J Appl Physiol. 2007 Jun;100(3):331-9. doi: 10.1007/s00421-007-0434-7. Epub 2007 Mar 15.
Treadmill locomotion is different with respect to overground walking and may require an adapted control mode. The relevant neural computational effort may produce lasting effects encroaching upon the performance of a subsequent postural task. The hypothesis of the present study was that, contrary to overground walking, treadmill walking has effects on quiet stance variables, in the assumption that the imposed locomotor activity is more critical to stance control than natural walking. Nine young subjects performed three different walking sessions: treadmill with eyes closed, treadmill with eyes open, overground walking with eyes open. Body sway area and sway path and the position of the centre of foot pressure during stance were recorded by a dynamometric platform under control, post-walking and post-recovery conditions, alternatively with eyes closed and eyes open. At variance with overground walking, treadmill locomotion produced an effect on body orientation in space during the subsequent stance trials. This consisted in a forward inclination of the body, not accompanied by increased body sway, lasting for a few minutes. Presence or absence of vision during treadmill locomotion did not induce differences in the amplitude or time-course of the post-effect. We argue that body inclination would be the consequence of a change in the postural reference produced by a message arising from treadmill locomotion itself, possibly connected to particularities in the control mode of this type of walking.
跑步机行走与地面行走不同，可能需要一种适应性的控制模式。相关的神经计算工作可能会产生持久影响，进而影响后续姿势任务的表现。本研究的假设是，与地面行走相反，跑步机行走会对安静站立变量产生影响，前提是施加的运动活动对姿势控制比自然行走更为关键。九名年轻受试者进行了三种不同的行走试验：闭眼在跑步机上行走、睁眼在跑步机上行走、睁眼地面行走。在控制、行走后和恢复后条件下，通过测力平台记录站立时的身体摆动面积、摆动路径以及足底压力中心的位置，交替进行闭眼和睁眼测试。与地面行走不同，跑步机行走在随后的站立试验中对身体在空间中的定向产生了影响。这表现为身体向前倾斜，且不伴有身体摆动增加，持续几分钟。跑步机行走过程中是否有视觉并未导致后效应的幅度或时间进程出现差异。我们认为，身体倾斜是由跑步机行走本身产生的信息所导致的姿势参考变化的结果，这可能与这种行走方式的控制模式特点有关。
