Poincare Plot Descriptors for HRV Analysis

Computes Poincare plot descriptors (SD1, SD2, SD1/SD2 ratio) from RR interval data. SD1 reflects short-term variability (perpendicular to the identity line), while SD2 reflects long-term variability (along the identity line).

Usage

ecgHRVpoincare(rr)

Arguments

rr

A data.frame with columns channel, rr_ms, and time_sec, as returned by ecgRRintervals.

Value

A data.frame with one row per channel and the following columns:

channel

Integer channel index.

sd1

Standard deviation perpendicular to the identity line (ms), reflecting beat-to-beat (short-term) variability.

sd2

Standard deviation along the identity line (ms), reflecting long-term variability.

sd1_sd2_ratio

Ratio of SD1 to SD2, or NA if SD2 is zero.

References

Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology (1996). "Heart rate variability: Standards of measurement, physiological interpretation and clinical use." Circulation, 93(5), 1043–1065.

See also

ecgHRVnonlinear for the combined nonlinear analysis wrapper, ecgSampleEntropy for sample entropy, ecgDFA for detrended fluctuation analysis.