Effect of beta1 selective adrenoceptor blockade on physiological response to exercise.
AUTOR(ES)
Gordon, N F
RESUMO
The effect of the beta1 selective adrenoceptor blocker, atenolol, on the physiological response to exercise was studied in 12 healthy young men. Oral atenolol (100 mg) and placebo were administered in a randomised double blind crossover fashion an hour and a half before an intermittent multistage cycle ergometer exercise test. At maximal effort oxygen consumption, pulmonary ventilation, carbon dioxide output, and respiratory exchange ratio were not modified by atenolol. In contrast, maximal heart rate and performance time were significantly reduced after atenolol. Nevertheless, because the relation of percentage of maximal oxygen consumption to percentage of maximal heart rate was not changed by atenolol both the absolute and relative oxygen consumption corresponding to 70% and 85% of the maximal heart rate remained unaltered. These data suggest that recommendations of exercise intensity may be determined on the basis of a calculated percentage of the predetermined maximal heart rate in persons without symptomatic coronary heart disease receiving beta1 selective adrenoceptor blockers.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=481856Documentos Relacionados
- Beta-adrenoceptor adaptation to acute exercise.
- Effect of beta blockade on exercise response after cardiac transplantation.
- Effects of Splenectomy and Beta-Adrenoceptor Blockade on Cardiac Output Response to Acute Hypoxemia
- Left ventricular function in hypothyroidism. Responses to exercise and beta adrenoceptor blockade.
- Effect of xamoterol (ICI 118587), a new beta1 adrenoceptor partial agonist, on resting haemodynamic variables and exercise tolerance in patients with left ventricular dysfunction.
