Figure 3From: Muscle activity and head kinematics in unconstrained movements in subjects with chronic neck pain; cervical motor dysfunction or low exertion motor output? Relationship between average velocity (log 10 ) and normalized jerk cost (NJC-10) (log 10 ) across all speed conditions for all movement directions pooled for the WAD (filled circles, n = 15, 180 trials) and the control (open circles, n = 15, 180 trials) groups. Back to article page