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(A) Heart rate reserve (HR reserve) and (B) attenuation of the heart rate recovery after exercise (ΔHRR) at first, (C) second and (D) fourth minute in patients with metabolic syndrome and obstructive sleep apnea (MetS + OSA), without obstructive sleep apnea (MetS - OSA) and in control subjects (C). *P ≤ 0.05 versus C, †P ≤ 0.05 versus MetS - OSA.
