Clarke K A
Department of Biomedical Science, University of Sheffield, Western Bank, UK.
Physiol Behav. 1995 Sep;58(3):415-9. doi: 10.1016/0031-9384(95)00072-q.
Previous studies suggest that the stance phase of the rat stride is initiated by a soft contact period when the forepaw may engage in tactile sampling of the terrain. However, no ground reaction force measurements have yet been made during rat locomotion. In the dog and other quadrupeds a brief or nonexistent soft contact phase is observed. Therefore, forces and pressures exerted via fore and hindpaws have been measured in the spontaneously walking rat. These indicate while the hindpaw vertical reaction forces are temporally similar to those in the dog, those transmitted via the forepaw are not. At average walking velocities the forepaw soft contact time is some 4 times longer than that of the hindpaw, with values of 207 +/- 25 ms and 52 +/- 12.2 ms (mean +/- 1 SEM) respectively. These data are consistent with the idea of forepaw useage to provide tactile information of the terrain during a prolonged initial soft contact phase, while the hindpaw transmits most of the early vertical ground reaction forces.
先前的研究表明，大鼠步幅的站立期始于一个软接触期，在此期间前爪可能会对地形进行触觉采样。然而，目前尚未在大鼠运动过程中进行地面反作用力测量。在狗和其他四足动物中，观察到短暂或不存在软接触阶段。因此，已经对自发行走的大鼠通过前爪和后爪施加的力和压力进行了测量。这些结果表明，虽然后爪垂直反作用力在时间上与狗的相似，但通过前爪传递的力则不同。在平均行走速度下，前爪软接触时间比后爪长约4倍，分别为207±25毫秒和52±12.2毫秒（平均值±1个标准误）。这些数据与以下观点一致：在前爪长时间的初始软接触阶段，前爪用于提供地形的触觉信息，而后爪传递大部分早期垂直地面反作用力。
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