s . bi o - ph ] 2 4 O ct 2 00 3 Response of Autonomic Nervous System to Body Positions : Fourier and Wavelet Analysis ∗
نویسندگان
چکیده
Two mathematical methods, the Fourier and wavelet transforms, were used to study the short term cardiovascular control system. Time series, picked from electrocardiogram and arterial blood pressure lasting 6 minutes, were analyzed Part of the results were reported at the 53rd Autumn Meeting of Italian Society of Physiology, 16-19 September, 2002, Ferrara, Italy. A short abstract was published in European Journal of Physiology R31, 445 (2003). E-mail address: [email protected] 1 in supine position (SUP), during the first (HD1), and the second half (HD2) of 90 head down tilt and during recovery (REC). The wavelet transform was performed using the Haar function of period T = 2j (j = 1,2,· · ·,6) to obtain wavelet coefficients. Power spectra components were analyzed within three bands, VLF (0.003-0.04), LF (0.04-0.15) and HF (0.15-0.4) with the frquency unit cycle/interval. Wavelet transform demonstrated a higher discrimination among all analyzed periods than the Fourier transform. For the Fourier analysis, the LF of R-R intervals and VLF of systolic blood pressure show more evident difference for different body positions. For the wavelet analysis, the systolic blood pressures show much more evident difference than the R-R intervals. This study suggests a difference in the response of the vessels and the heart to different body positions. The partial dissociation between VLF and LF results is a physiologically relevant finding of this work. PACS: 87.10.+e, 87.80.-y, 87.90.+y
منابع مشابه
s . bi o - ph ] 2 5 O ct 2 00 3 Response of Autonomic Nervous System to Body Positions : Fourier and Wavelet Analysis ∗
Aiguo Xu , G. Gonnella, A. Federici S. Stramaglia F. Simone, A. Zenzola, R. Santostasi 1 TIRES, Center of Innovative Technologies for Signal Detection and Processing, via Amendola 173, 70126 Bari, Italy 2 Dipartimento di Fisica, Università di Bari, and Istituto Nazionale per la Fisica della Materia, Unità di Bari, via Amendola 173, 70126 Bari, Italy 3 INFN, Sezione di Bari, via Amendola 173, 70...
متن کاملResponse of Autonomic Nervous System to Body Positions: Fourier and Wavelet Analysis
Two mathematical methods, the Fourier and wavelet transforms, were used to study the short term cardiovascular control system. Time series, picked from electrocardiogram and arterial blood pressure lasting 6 minutes, were analyzed in supine position (SUP), during the first (HD1), and the second half (HD2) of 90◦ head down tilt and during recovery (REC). The wavelet transform was performed using...
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