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Femoral arterial blood flow (A), mean femoral arterial blood pressure (B), and leg vascular conductance (C) in young and older subjects at rest and during femoral arterial sodium nitroprusside (SNP) infusion without (CON) and with sildenafil. Significant difference from CON within same condition: *P < 0.05; significant difference from young within same condition: #P < 0.05.
