Fig. 1From: Utilizing heart rate variability to predict ICU patient outcome in traumatic brain injuryExample of RR time series analysis in the Time and Frequency domains. The RR time series are derived into the time and frequency domains. Time domain calculates overall variability within the sample, and frequency domain calculates autonomic modulation. (Kubios software, version 2.2, Biosignal Medical Group, Kupio, Finland)Back to article page