... of vasoconstriction during nerve stimulation followed by a prolonged dilatation. The vasoconstrictor response was mediated by noradrenaline acting mainly via α 1 -adrenoceptors as it was substantially reduced by close intra-arterial injection of the α-adrenergic antagonist phentolamine (∼50% reduction...

.... α-Adrenergic receptors Adrenergic neurotransmission Vascular smooth muscle Nerve stimulation Negative feedback Original Papers Blood Vessels 16: 113-125 (1979) Interaction between Neuronal Amine Uptake and Prejunctional Alpha-Adrenergic Receptor Activation in Smooth Muscle from Canine Blood...

... increase in tension, but decreased the amount of 3 H-norepinephrine and metabolites overflowing into the superfusate. These experiments demonstrate that the potentiating effect of cooling on the response of cutaneous veins to sympathetic nerve stimulation is not associated with facilitation of adrenergic...