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Microneurographic recordings of muscle nerve sympathetic activity, which is governed by baroreceptors and involved in blood pressure regulation, were made in the peroneal nerve in 16 healthy volunteers during physiological bladder distension. When the urge to urinate was pronounced, sympathetic outflow increased from a baseline level of 16.3 +/- 1.7 to 23.2 +/- 1.9 bursts/min (mean +/- SEM, p less than 0.01). There was a concomitant significant rise in both systolic and diastolic blood pressure, from 125 +/- 2/74 +/- 2 to 140 +/- 4/84 +/- 3 mm Hg. After micturition, sympathetic activity and blood pressure returned toward initial values. It is concluded that 1) increased sympathetic outflow contributed to the rise in blood pressure, 2) there is a vesicovascular response mediated by sympathetic vasoconstrictor neurons in humans corresponding to mechanisms observed in animals, and 3) the described functional relation between bladder distension and sympathetic vasoconstrictor activity probably plays a role in clinical conditions such as autonomic dysreflexia in humans with cervical spinal cord lesions and nocturnal micturition syncope.

Sympathetic activity and blood pressure increases with bladder distension in humans.