Figure 1

Movement and speed profiles from a subject with neck pain and a healthy control. Exemplar plots of the helical angle (upper panels) and the corresponding 3 D angular speed (lower panels) for the outward rotation in one trial for one subject from the neck pain group (A) and the control group (B). Both subjects have Peak Speeds comparable to their respective group means (group mean and SD for Peak Speed was 226 ± 88 for NS and 348 ± 92 for CON for the pooled samples). The dashed vertical lines represent the start and stop of the movement where a 10% value of the Peak Speed was reached.