Thirteen borderline hypertensives were investigated at rest and during dynamic exercise, before and after therapy with nadolol (40-80 mg/day for 7-28 days), in order to evaluate regulation of the number of lymphocyte beta-receptors. Systolic blood pressure and the heart rate were measured before and after 15 min of bicycle exercise, both with and without nadolol therapy; blood samples were withdrawn for adrenaline, noradrenaline and lymphocyte beta-receptor determinations. Nadolol induced a significant decrease in systolic blood pressure and the heart rate at rest, while plasma catecholamines and lymphocyte beta-receptors did not change significantly. Of the physiological responses to dynamic exercise (increases in systolic blood pressure, heart rate, plasma noradrenaline levels and adrenaline and lymphocyte beta-receptors), only the rise in beta-receptors was entirely prevented, and the increase in the heart rate was significantly attenuated by nadolol. It is suggested that the lack of a rise in the number of beta-receptors during exercise may contribute to the blunted exercise-induced tachycardia in patients taking nadolol.
|Titolo:||Nadolol prevents the exercise-induced rise in lymphocyte beta-receptor number in borderline hypertension|
LEONETTI, GASTONE (Penultimo)
ZANCHETTI, ALBERTO (Ultimo)
|Parole Chiave:||Drug Evaluation; Receptors, Adrenergic, beta; Humans; Physical Exertion; Adult; Nadolol; Middle Aged; Radioligand Assay; Lymphocytes; Hypertension|
|Settore Scientifico Disciplinare:||Settore MED/09 - Medicina Interna|
|Data di pubblicazione:||dic-1989|
|Appare nelle tipologie:||01 - Articolo su periodico|