Brief work induced fatigue in both groups, but significantly higher in patients with fibromyalgia (FM).

<p>Median (IQR) perceived fatigue by 32 women with FM and 32 healthy, pain-free age-matched controls, before and during repeated dynamic contractions of the quadriceps muscle (brief work). * = The brief work induced fatigue in both groups (Friedman ANOVA: P < .001). The perceived fatigue was significantly higher at all time-points during the brief work in patients with fibromyalgia (Holm-Sidak; P < .001).