Fig. 6.

Wavelet phase coherence and windowed wavelet phase coherence from one subject. These data document a much stronger influence of breathing on wavelet phase coherence of systolic pressure and R-R interval than on diastolic pressure and muscle sympathetic nerve oscillations, as shown in Fig. 5. Significant phase coherence between breathing and systolic pressure oscillations was limited primarily to the usual breathing frequency range. Phase coherence between systolic pressure and R-R interval oscillations (G and I) was significant over a wide frequency range, and in the low frequency range it approached 1.0, perfect coherence.