Pharmacological effects of concomitant administration of beta-adrenoceptor blocker and agonist in normal subjects: characterization by heart rate response to exercise. Effects of beta-blocker combined with beta-agonist

European Journal of Clinical Pharmacology
M KaritaT Kamada

Abstract

The effects of a combination regimen of metoprolol and beta 1-adrenoceptor agonist denopamine on resting and exercise heart rate have been studied in 10 normal volunteers. Maximal ramp upright bicycle exercise was performed three times at 1-week intervals. Two hours before each exercise test, 5 mg metoprolol plus 20 mg denopamine, 5 mg metoprolol plus a denopamine placebo, or two placebos were orally administered in a double-blind fashion. During exercise after placebo administration, heart rate increased in parallel with the exercise intensity. Compared to the placebo values, resting heart rate was significantly decreased by an average of 10 beats.min-1 by 5 mg metoprolol, whereas it was not altered by the combination regimen. During exercise, however, both the combination regimen and metoprolol alone showed a significant negative chronotropic effect, decreasing peak exercise heart rate by an average of 14 and 21 beats.min-1, respectively. Peak oxygen uptake was also significantly decreased by both regimens. We conclude that concomitant administration of 5 mg metoprolol and 20 mg denopamine exerts an effective beta-adrenoceptor blocking action during exercise but a minimal effect at rest in normal subjects. The combination reg...Continue Reading

Citations

Sep 12, 2016·European Journal of Applied Physiology·Ineke NederendEco J C de Geus
Nov 2, 2005·Medicine and Science in Sports and Exercise·Peter HofmannSerge P von Duvillard

❮ Previous
Next ❯

Related Concepts

Related Feeds

Adrenergic Receptors: Trafficking

Adrenergic receptor trafficking is an active physiological process where adrenergic receptors are relocated from one region of the cell to another or from one type of cell to another. Discover the latest research on adrenergic receptor trafficking here.