The distribution of the age-matched participants, divided by 32 patients with fibromyalgia and 32 healthy controls.

SD = Standard deviation; BMI = body mass index; IQR = Interquartile range (75 percentile minus 25 percentile); VAS = Visual analogue scale (0–100); Borg’s RPE = Borg’s Rating of Perceived Exertion Scale (6–20); HAD-Depression = Hospital Anxiety and Depression Scale–subscale depression; HAD-Anxiety = Hospital Anxiety and Depression Scale–subscale anxiety; SF36-PCS = Short Form Health Survey–subscale physical summary components; SF36-MSC = Short Form Health Survey–subscale mental summary components.Their mean (SD) age (years), mean (SD) BMI (kg/m2), median (IQR) duration of pain (years), mean (SD) scores of depression, anxiety and quality of life, and median (IQR) intensity of pain (VAS), fatigue (Borg’s RPE) before microdialysis (-5 min) and at baseline (i.e. before the dynamic contractions at 120 min) is shown.