Figure 4: Average change in mean spindle discharge to spinal manipulation delivered under force control as thrust duration becomes shorter, thrust amplitude becomes larger. Thrust amplitude based upon each cat’s body weight. Symbols represent average for the cohort. Error bars represent adjusted 95% confidence intervals. between 25 and 50 ms thrust duration for 25% BW. between 150 and 100 ms thrust duration for 25% BW. * between 100 and 75 ms thrust duration for 55% BW. Abbreviations identical to those in Figure 3.