Figure 1From: Is there evidence of fetal-maternal heart rate synchronization?Relative timing of R peaks. Sample histograms of the timing of the fetal R peaks relative to the simultaneous maternal RR intervals (φ mat , top panel) and of the maternal R peaks relative to the simultaneous fetal RR intervals (φ fet , bottom panel). The distributions are statistically nonuniform (p < 0.05).Back to article page