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Figure 2 Forearm blood flow responses to norepinephrine (±propranolol) in women and men. Bars indicate mean ± SEM percent change in blood flow ratio (infused/noninfused arm). Open bars show responses to norepinephrine coinfused with saline; closed bars show responses to norepinephrine coinfused with propranolol (190 nmol/min). Reduction in forearm blood flow during norepinephrine infusion was significantly greater in men than it was in women (n = 8 for each gender, p = 0.02). Propranolol coinfusion significantly increased the response to norepinephrine in women (p = 0.0004) but not in men (p = 0.58). During infusion of propranolol, responses to norepinephrine were similar (p = 0.34) in women and men.