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. Author manuscript; available in PMC: 2010 Jul 10.
Published in final edited form as: Int J Cardiol. 2008 Jul 7;135(3):346–352. doi: 10.1016/j.ijcard.2008.04.007

Figure 1.

Figure 1

Experimental protocol. A 20 min baseline period was followed by successive 13 min α-adrenergic blockade (phentolamine) and 18 min combined α-adrenergic blockade and nitric oxide synthase inhibition [phentolamine and NG-monomethyl-L-arginine (L-NMMA)]. Hemodynamic measurements were performed 3 times: at baseline, with systemic α-adrenergic blockade, and with the combined systemic α-adrenergic blockade and systemic NOS inhibition. Cold pressor tests (CPT) were performed before the baseline and immediately after the combined blockade. HR=heart rate, BP=brachial blood pressure, AC=arterial compliance.