Nonlinear Conte-Zbilut-Federici (CZF) Method of Computing LF/HF Ratio: A More Reliable Index of Changes in Heart Rate Variability
Autor: | Sudhakar Pemminati, Krishna Kumar, Kishan Kadur, Richard M. Millis, Bryan H. Curry, Vasavi Rakesh Gorantla, Vernon Bond |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
medicine.medical_specialty
lcsh:Medicine Standard deviation 03 medical and health sciences 0302 clinical medicine autoregressive Internal medicine Heart rate medicine Heart rate variability Aerobic exercise lcsh:Miscellaneous systems and treatments Mathematics Pharmacology autonomic modulation exercise Lf hf ratio lcsh:R lcsh:RM1-950 heart rate variability Acupuncture treatment lcsh:RZ409.7-999 fast Fourier transform 030205 complementary & alternative medicine Nonlinear system lcsh:Therapeutics. Pharmacology Complementary and alternative medicine Power ratio Cardiology Original Article 030217 neurology & neurosurgery acupuncture |
Zdroj: | Journal of Pharmacopuncture, Vol 19, Iss 3, Pp 207-212 (2016) Journal of Pharmacopuncture |
ISSN: | 2234-6856 2093-6966 |
Popis: | Objectives: Acupuncture treatments are safe and effec tive for a wide variety of diseases involving autonomic dysregulation. Heart rate variability (HRV) is a noninvasive method for assessing sympathovagal balance. The low frequency/high frequency (LF/HF) spectral power ratio is an index of sympathovagal influence on heart rate and of cardiovascular health. This study tests the hypothesis that from rest to 30% to 50% of peak oxygen consumption, the nonlinear Conte-Zbilut-Federici (CZF) method of computing the LF/HF ratio is a more reliable index of changes in the HRV than linear methods are. Methods: The subjects of this study were 10 healthy young adults. Electrocardiogram RR intervals were measured during 6-minute periods of rest and aerobic exercise on a cycle ergometer at 30% and 50% of peak oxygen consumption (VO2peak). Results: The frequency domain CZF computations of the LF/HF ratio and the time domain computations of the standard deviation of normal-to-normal intervals (SDNN) decreased sequentially from rest to 30% VO2peak (P < 0.001) to 50% VO2peak (P < 0.05). The SDNN and the CZF computations of the LF/HF ratio were positively correlated (Pearson’s r = 0.75, P < 0.001). fast Fourier transform (FFT), autoregressive (AR) and Lomb periodogram computations of the LF/HF ratio increased only from rest to 50% VO2peak. Conclusion: Computations of the LF/HF ratio by using the nonlinear CZF method appear to be more sensitive to changes in physical activity than computations of the LF/HF ratio by using linear methods. Future studies should determine whether the CZF computation of the LF/HF ratio improves evaluations of pharmacopuncture and other treatment modalities. |
Databáze: | OpenAIRE |
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