Fig. 2

Development of systolic BP (a), diastolic BP (b), heart rate (c) finger blood flow (d) and pain (e) throughout the stressful task and recovery period in chronic pain patients (chronic TTH, FMS and SNP) and episodic pain/no pain subjects (episodic TTH, migraine and controls). Values are given as group means (SEM). UIR: uninstructed rest period (baseline EMG). 0–60 min: duration of the cognitive stressful task. 65–95 min: relaxation period after the test