we raised and lowered arterial pressures with stepwise intravenous infusions of phenylephrine and nitroprusside in ten healthy young men and measured changes of r-r intervals , post-ganglionic peroneal nerve muscle sympathetic activity , and antecubital vein plasma noradrenaline and neuropeptide y concentrations .
C0020649
lowered arterial pressures
C0028351
noradrenaline