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    Background We have previously demonstrated that severity of obstructive sleep apnea as measured by the apnea-hypopnea index is a significant independent predictor of readily-computed time-domain metrics of short-term heart rate variability. Methods We aimed to assess time-domain HRV measured over 5-min while awake in a trial of obese subjects undergoing one of two OSA therapies: weight-loss surgery for BMI 43.7 [42.0, 51.4] kg/m2, and AHI 18.1 [16.3, 67.5] events/h) or continuous positive airway…Read more