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Group differences in respiratory sinus arrhythmia (A) and Traube–Hering wave amplitude (B; Δ, change values across the respiratory cycle). PMF, postmenopausal females (n = 13); YF, premenopausal females (n = 12); YM, younger males (n = 12). Data are medians ± interquartile ranges. Kruskal–Wallis test. Pairwise comparisons for both variables compared mean ranks.
