Figure 2.

The effect of moderately intense exercise on muscle hyperalgesia. Acidic saline injections significantly decreased muscle withdrawal thresholds on the ipsilateral and contralateral sides. Moderately intense exercise training significantly increased the muscle withdrawal thresholds of both hind limbs (A and B, P<.05). The thin black arrow indicates the injection of acidic or normal saline. The larger, open arrow indicates the initiation of exercise training. Data are represented as change in mean score from before injection to each time point; error bars indicate standard error of the mean. * denotes P<.05 for difference between experimental and placebo status (acidic versus normal saline) at the postinjection time point. # denotes P<.05 for difference between exercise and no exercise at the postexercise time point.