Circulating catecholamines, plasma renin and dopamine-beta-hydroxylase activity with postural stress

Epinephrine and Norepinephrine Responses in Continuously Collected Human Plasma to a Series of Stressors

“…The stressors that have produced substantial increases in plasma norepinephrine include submerging the hand or body in ice water (2, 5 -7), performing a tilt stress (6,8,9), assuming a standing position from the supine (6, 7, 10 -12), completing an isometric handgrip test (6,7,12), and engaging in physical exercise (4,10,13).…”

Assessment of Adrenergic and Vagal Activity by Plasma Dopamine-β-Hydroxylase and Pancreatic Polypeptide During Exhaustive and Endurance Exercise

“…Performing an isometric hand grip on a hand dynamometer of 30% of the maximal performance for 5 mm, normotensive and hypertensive subjects did not show an increase in plasma DBH activity whereas plasma norepinephrine rose by 83% (14). Comparing plasma levels of DBH in patients suffering from myocardial infarction and in hypertensive patients, no correlation could be demonstrated between cardiovascular variables and catecholamines and plasma renin (12,14,16). Since 13-blocking agents are known to enhance the exercise-induced increase in catecholamines, the exhaustive exercise test was repeated in control subjects after the administration of propranolol (11,13).…”