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- W1489360219 abstract "Our aims were to use a chirp-type breathing maneuver to obtain a continuous relation between the high frequency component of HRV (HF RR ) and respiratory frequency (RF), and to assess if it indicates the vagal withdrawal induced by a postural change. ECG and lung volume were registered from 30 subjects who performed, in sitting and standing, a 70-s continuous linear RF increase from 0.05 to 0.8 Hz at constant tidal volume. From the smoothed pseudo-Wigner-Ville distribution of the RR intervals and tidal volume series, HFRR and RF were computed to obtain the relation. After log-transformation, correlations were −0.88±0.03 in sitting and −0.89±0.04 in standing. With the postural change the intercept decreased (p≪0.001) and the slope increased (p≪0.009), indicating a vagal withdrawal. The continuous HF RR -RF relation we obtained can assess the vagal effect of the postural change independently from the RF influence, improving the interpretability of HFRR as vagal index." @default.
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- W1489360219 date "2009-09-01" @default.
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- W1489360219 title "Continuous relation between high frequency component of HRV and respiratory frequency during postural change" @default.
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