Figure 2
Modulus (A) and phase (B) of the Zi in the same rat shown in Fig. 1 and a Dolph-Chebychev weighting function with order 24 (C) and the impulse response functin curve (D) derived from the filtered Zi shown in A and B. In (C), this Dolph-Chebyshev filter is used to reduce the effects of truncation of the impedance. In (D), the long arrow shows the discrete reflection peak from the body circulation and the short arrow indicates the initial peak as a reference. Half of the time difference between the appearance of the reflected peak and the initial peak approximates the arterial τw in the lower body circulation. In this case, the arterial τw was 27.9 ms. Zi, aortic input impedance spectra; τw, wave transit time.
