Key result
Poincaré plot indexes strongly correlated with time domain indexes (correlation 0.997 between L and SD), indicating they perform equivalently as autonomic markers.
Why the study?
Do Poincaré plot indexes correlate with time and frequency domain measures of heart rate variability in healthy volunteers?
Observational (n=21)
Do Poincaré plot indexes correlate with time and frequency domain measures of heart rate variability in healthy volunteers?
Effect estimate: Correlation 0.997
Poincaré plot indexes of heart rate variability are highly correlated with temporal indexes and do not offer a performance advantage as autonomic markers.
Correlations in healthy volunteers support Poincaré plots for autonomic research; leaves open clinical validation and superiority over standard HRV measures.
PRIMARY OBJECTIVE: In order to corroborate the rported performance advantage of Poincaré plot indexes as autonomic activity markers, the correlation among these indexes and those computed from the time and frequency domains were obtained. METHODS AND PROCEDURES: Starting from the RR series derived from the ECG of 21 healthy volunteers during five manoeuvres, longitudinal (L), transverse (T) axis, and autocorrelation (r) from Poincaré plots, rMSSD and standard deviation (SD) in the temporal domain, and frequency domain indexes were computed. MAIN OUTCOMES AND RESULTS: Poincaré plot indexes were correlated in a better way with the time indexes, rather than the spectral measures. A strong correlation (0.997) between L and SD was observed, while an underlying mathematical relationship was established for T vs rMSSD. CONCLUSIONS: Poincaré plot indexes may be considered as equivalent or surrogates of the temporal ones, and they do not have a better performance as autonomic markers.
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M. J. Gaitán S. Carrasco (2001) conducted an observational in Healthy volunteers (n=21). Poincaré plot indexes vs. Time and frequency domain measures was evaluated on Correlation among Poincaré plot indexes and time and frequency domain measures (Correlation 0.997). Poincaré plot indexes strongly correlated with time domain indexes (correlation 0.997 between L and SD), indicating they perform equivalently as autonomic markers.
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