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Panel A shows individual forearm blood flow (FBF) at baseline (Bsl), and the peak responses to acetylcholine (ACh, circles) and sodium nitroprusside (SNP, closed squares), during the intact (closed) and blocked (open) days. Panel B shows the change in FBF (peak minus saline or trimethaphan) for both ACh and SNP. The peak increase in FBF induced by these drugs was statistically significant between study days only for ACh (*, p<0.05 by Wilcoxon sign-rank test).
