sEMG activity during evening activities. Median sEMG level (%EMGmax) for clavicular and acromial fibers of dominant trapezius, middle deltoid, and biceps brachii during quiet seated activity at the patient hotel (A), evening meal (B), and the 5-min period with lowest sEMG activity during the evening (C). Healthy controls (open circles) and fibromyalgia (FM) patients (filled circles) are represented by different symbols. Error bars indicate 95% CI of median.
Westgaard et al. BMC Musculoskeletal Disorders 2013 14:97 doi:10.1186/1471-2474-14-97