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Am J Physiol Heart Circ Physiol 275: H213-H219, 1998;
0363-6135/98 $5.00
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Vol. 275, Issue 1, H213-H219, July 1998

Dynamics of spectral components of heart rate variability during changes in autonomic balance

Michael V. Højgaard1,2, Niels-Henrik Holstein-Rathlou2, Erik Agner1, and Jørgen K. Kanters1,2

1 Department of Internal Medicine, Coronary Care Unit, Elsinore Hospital, DK-3400 Elsinore; and 2 Department of Medical Physiology, University of Copenhagen, DK-2200 Copenhagen, Denmark

Frequency domain analysis of heart rate variability (HRV) has been proposed as a semiquantitative method for assessing activities in the autonomic nervous system. We examined whether absolute powers, normalized powers, and the low frequency-to-high frequency ratio (LF/HF) derived from the HRV power spectrum could detect shifts in autonomic balance in a setting with low sympathetic nervous tone. Healthy subjects were examined for 3 h in the supine position during 1) control conditions (n = 12), 2) acute beta -blockade (n = 11), and 3) chronic beta -blockade (n = 10). Heart rate fell during the first 40 min of the control session (72 ± 2 to 64 ± 2 beats/min; P < 0.005) and was even lower during acute and chronic beta -blockade (56 ± 2 beats/min; P < 0.005). The powers of all spectral areas rose during the first 60 min in all three settings, more so with beta -blockade (P < 0.05). LF/HF was found to contain the same information as powers expressed in normalized units. LF/HF detected the shift in autonomic balance induced by beta -blockade but not the change induced by supine position. In conclusion, none of the investigated measures derived from power spectral analysis comprehensively and consistently described the changes in autonomic balance.

sympathetic and parasympathetic nervous activity; low frequency-to-high frequency ratio and normalized units; beta -blockade; posture; human subjects


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