The regulation of limb stiffness in the context of locomotor tasks.

摘要: Locomotion on ramped surfaces requires modulation of both pattern-generating circuits and limb stiffness. To meet the mechanical demands locomotion under these conditions, muscular activation patterns must correspond to appropriate functions, whether muscles are serving as force generators or brakes. Limb stiffness is a critical property that determines how body interacts with environment, regulated by intrinsic neural mechanisms. We have recently investigated pattern generation, stiffness, proprioceptive feedback modulated in task-specific way using decerebrate cat preparation. Our results confirm previous research intact animals during level upslope walking, hip ankle extensors recruited for propulsion stance. During downslope inhibited flexors stance provide needed braking action. new data further show endpoint correspondingly reduced walking down slope, reduction likely due an increase inhibitory feedback. suggest orientation signal derived from vestibular neck information responsible required well This increased compliance consistent function distal cushion impact action antigravity musculature.