Fig. 1: Heatmap illustrating the strength and polarity of linear relationships among HRV measures. | npj Mental Health Research

Fig. 1: Heatmap illustrating the strength and polarity of linear relationships among HRV measures.

From: Electrocardiography-derived autonomic profiles in depression and suicide risk with insights from the UK Biobank

Fig. 1: Heatmap illustrating the strength and polarity of linear relationships among HRV measures.

BPM beats per minute, SDNN Standard deviation for intervals between adjacent beats, RMSSD Root mean square of successive differences between adjacent R-R intervals, pNN20/pNN50 Proportion of differences greater than 20 ms or 50 ms, MAD Median absolute deviation heart rate, SD1/SD2 Standard deviation in the two orthogonal directions of the Poincaré plot (for frequency domain), BR breathing rate, LF low frequency component power, HF High frequency component power, LFnu Normalized low frequency power, TP Total heart rate variability power.

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