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Szili-Török T, Gingl Z, Halmai L, Kardos A, Rudas L
Windowed FFT - a time-variant spectral analysis: applicability during the head-up tilt test
Journal of Clinical and Basic Cardiology 1999; 2 (2): 241-244

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Fig. 1A-D: Kipptisch Fig. 2A-D: Kipptisch This Image - Fig. 3: Kipptisch
Figure/Graphic 3: Kipptisch
3D projection of the HRV (upper panel) and BPV (lower panel) spectral changes following the upright tilt as assessed by windowed FFT in the same syncopal patients as in Fig. 2. The spatial projection allows a thorough assessment of the temporal changes and interrelationship of all spectral components. Thus, it is apparent that the double elevation in the LFBPV response depicted in Fig. 2 is related to changes in different segments of the LF band. Even the two minor elevations in the HFBPV band are quite discernible.
 
Kipptisch
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Figure/Graphic 3: Kipptisch
3D projection of the HRV (upper panel) and BPV (lower panel) spectral changes following the upright tilt as assessed by windowed FFT in the same syncopal patients as in Fig. 2. The spatial projection allows a thorough assessment of the temporal changes and interrelationship of all spectral components. Thus, it is apparent that the double elevation in the LFBPV response depicted in Fig. 2 is related to changes in different segments of the LF band. Even the two minor elevations in the HFBPV band are quite discernible.
 
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