Figure 4From: Quantification of the effects of an alpha-2 adrenergic agonist on reflex properties in spinal cord injury using a system identification techniqueReflex and intrinsic stiffness gain as a function of ankle angle (Group averages). A Reflex stiffness gain (G R ), B Intrinsic stiffness gain (K). Pre-tizanidine (circles) and post-tizanidine (squares). Error bars indicate ±1 standard errors. NP: Neutral Position (90°).Back to article page