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Endothelium-dependent dilation (forearm blood flow to intrabrachial artery infusion of ACh; 1.0, 2.0, 4.0, and 8.0 μg/100 ml forearm tissue; A) and endothelium-independent dilation (forearm blood flow to intrabrachial artery infusion of SNP; 0.5, 1.0, and 2.0 μg/100 ml forearm tissue; B) in young and older men. Values are means ± SE. *P < 0.01 vs. young.
