Fig. 8.

Median wavelet phase shift and phase coherence relations for all subjects. Breathing exerted no significant effect on diastolic and systolic pressure, and muscle sympathetic nerve and R-R interval phase relations (A and B). Although neither breathing mode affected coherence between breathing and muscle sympathetic nerve oscillations (C), breathing significantly increased phase coherence between systolic pressure and R-R interval oscillations in a limited portion of the usual breathing frequency range (D, yellow shading, circled).