[Spectrum analysis of blood pressure and cardiac rate in the conscious rat].
Intrafemoral pulsatile blood pressure of conscious rats was computed to generate evenly spaced signals (systolic, diastolic, mean blood pressure, heart rate) at 200 ms intervals. This equidistant sampling allowed a direct spectral analysis using a Fast Fourier Transform algorithm. Systolic blood pressure and heart rate exhibited low frequency oscillations (Mayer waves, 20-605 mHz) and a high frequency peak related to respiration (1,765 mHz). The diastolic blood pressure and the mean blood pressure only exhibited low frequency oscillations. This procedure could be useful to analyze the various components of blood pressure variability.
Grichois
M L
ML
Laboratoire de Pharmacologie, I.N.S.E.R.M. n U7, Faculté de Médecine Necker-Enfants Malades, Paris.
Japundzic
N
N
Zitoun
P
P
Elghozi
J L
JL
D000704:Analysis of Variance; D000818:Animals; D001794:Blood Pressure / Q000502:physiology*; D001795:Blood Pressure Determination / Q000379:methods*; D003199:Computer Systems; D005583:Fourier Analysis; D006339:Heart Rate / Q000502:physiology*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013057:Spectrum Analysis
Analyse spectrale de la pression artérielle et de la fréquence cardiaque du rat conscient.