Fig. 2From: Exercise training and cardiac autonomic function following coronary artery bypass grafting: a systematic review and meta-analysisForest plots for time domain HRV indices. a Overall changes in standardized mean difference indices for the standard deviation of all RR intervals (SDNN). b Overall changes in standardized mean difference indices for the standard deviation of the 5-min mean RR intervals (SDANN). c Overall changes in standardized mean difference indices for square root of the mean squared differences between successive RR intervals (RMSSD)Back to article page