Bonnard M, Pailhous J
Université d'Aix-Marseille II, France.
J Exp Psychol Hum Percept Perform. 1993 Apr;19(2):429-43. doi: 10.1037//0096-1523.19.2.429.
Tight frequency-to-amplitude relationships are observed in spontaneous human steady gait. If required, however, they can be modified. The following experiments were aimed at the processes underlying this flexibility, which forms the fundamental basis of the intentional adaptive capabilities of locomotion. In Experiment 1, Ss had to intentionally modify the frequency-to-amplitude relationship (leading to preferred or nonpreferred steady states). In Experiment 2, they had to temporarily perturbate the stride-frequency-to-amplitude relationship to intentionally shorten or lengthen 1 stride. Within the important constraints exerted by the head-arm-trunk system on leg movement, the results pointed out 2 main strategies that allow the S to intentionally adapt stride organization on-line: adjustment of the tonic properties of the oscillating leg to achieve nonpreferred steady states and phasic action to ensure temporary movement away from a steady state.
在人类自发的稳定步态中观察到紧密的频率与振幅关系。然而，如果需要，这种关系可以被改变。以下实验旨在探究这种灵活性背后的过程，这种灵活性构成了运动有意适应能力的基本基础。在实验1中，受试者必须有意改变频率与振幅的关系（导致偏好或非偏好的稳定状态）。在实验2中，他们必须暂时扰动步频与振幅的关系，以有意缩短或延长一步。在头部 - 手臂 - 躯干系统对腿部运动施加的重要限制范围内，结果指出了两种主要策略，使受试者能够在线有意地调整步幅组织：调整摆动腿的紧张性特性以实现非偏好的稳定状态，以及阶段性动作以确保暂时偏离稳定状态。
