Fig. 2

Wavelet amplitudes of endothelial NO-independent, endothelial NO-dependent, and neurogenic activities in four phases, including the baseline phase, in the study subjects. These subjects showed the presence (a) or absence (b) of a CIVD response (a n = 84; b n = 10). All study subjects (n = 94) are shown in c. Phases 1, 2, and 3 represent “vasoconstriction,” “prior to CIVD,” and “CIVD,” respectively [9]. Data are means ± standard error of the mean. * p < 0.05 and ** p < 0.01 (compared with the baseline using Dunnett’s test). a.u., arbitrary units