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Regression analysis of MSNA with cardiac output in young (n=14) and older men (n=17). The inverse relationship between MSNA and cardiac output in young men was not observed in older men (r=0.13; P>0.05). This lack of relationship persisted when the older men (circled data points) with high cardiac outputs were removed from the analysis (burst incidence: r=0.29; burst frequency: r=0.35; P>0.05).
