Correlations between the Poincaré plot and conventional heart rate variability parameters assessed during paced breathing.

摘要: Aim: To analyze the correlation of Poincare plot descriptors RR intervals with standard measures heart rate variability (HRV) and spontaneous baroreflex sensitivity (BRS). A physiological model changing respiratory rates from 6 to 15 breaths/min provided a wide range for analysis. Material methods: Beat-to-beat finger blood pressure, ECG, curves were recorded noninvasively in young healthy volunteers (19-25 years old; 7 females) breathing 5 min at 4 different 6, 9, 12, breaths/ min. Four (SD1, SD2, S, SD2/SD1), time frequency domain HRV, BRS (cross-correlation method) calculated each 5-min recording. Results: The values SD1 characterizing short-term SD2 describing long-term S measuring total HRV significantly correlated short, long, HRV. LF/ HF SD2/SD1 representing balance between long- None was mean interval. increased caused significant reduction BRS, an increase that peaked 12 breaths/min. Conclusions: are but not rate. faster reduces temporarily increases HF.