Fig. 2

Group differences of cardiovascular parameters during paced breathing and mental stress test between controls and migraine patients. A RMSSD (root mean square of successive differences) and B HR (heart rate) profiles are illustrated interictally for migraine patients (n = 22) and controls (n = 25) as mean ± SEM. a1 RMSSD during the paced breathing test. a2 RMSSD during the mental stress test. b1Heart rate (HR) during the paced breathing test. b2 HR during the mental stress test