Folgering HT, Borm JF, van Haaren RH. Metabolic aspects of maximal exercise performance after slow release metoprolol and after atenolol.
Eur J Clin Pharmacol 1982;
23:283-8. [PMID:
7173299 DOI:
10.1007/bf00613607]
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Abstract
Maximal exercise performance by eight healthy male subjects was tested after one week of medication with slow-release metoprolol 200 mg/d (metoprolol-SR), atenolol 200 mg/d or placebo, in a double blind crossover trial. The maximal working capacity was significantly decreased after atenolol and metoprolol-SR. Plasma glucose and FFA concentrations during the exercise test did not change: either after placebo therapy or after beta-blockade. The anerobic threshold did not change after beta-blockade, but the changes in lactate due to the exercise were less after beta-blockade. Neither beta-blocker affected the exercise-induced alteration in airway resistance. Both drugs caused a small but significant ventilatory depression at rest and at 75% of maximal exercise. It is concluded that the limiting factor in maximal exercise performance after beta 1-adrenergic blockade does not lie in oxygen transport to the working muscles via ventilation and the circulation, but is most probably due to anaerobic metabolism.
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