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Table 1 Controlled heart rate variability analyses in patients with fibromyalgia

From: Biology and therapy of fibromyalgia. Stress, the stress response system, and fibromyalgia

Reference Number of patients Number of controls Duration of heart rate variability analysis Main conclusion
Martinez-Lavin and colleagues, 1998 [11] 30 women 30 women 24 hours Sympathetic hyperactivity
Cohen and colleagues, 2000 [12] 22 women 22 women 20 minutes Sympathetic hyperactivity
Raj and colleagues, 2000 [13] 17 women 14 women 24 hours Sympathetic hyperactivity
Cohen and colleagues, 2001 [14] 19 men 19 men 20 minutes Sympathetic hyperactivity
Stein and colleagues, 2004 [15] 26 (19 women, 7 men) 36 (18 women, 18 men) 24 hours Sympathetic hyperactivity in women, not in men
Furlan and colleagues, 2005 [16] 16 women 16 women 30 minutes Sympathetic hyperactivity
Ulas and colleagues, 2006 [17] 34 women 22 women 30 minutes Sympathetic hyperactivity