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pubmed-article:2871007pubmed:abstractTextTo study the effects of cardiovascular fitness on hemodynamic responses to exercise during beta-adrenergic blockade (BAB), submaximal [60% of maximum O2 uptake (VO2max)] and maximal treadmill exercise data were collected in 11 trained (T, VO2max 63.3 ml X kg-1 X min-1, 26.8 yr) and 11 untrained (UT, VO2max 44.5 ml X kg-1 X min-1, 25.0 yr) male subjects. Subjects completed two maximal control tests followed by a randomized, double-blind series of maximal tests after 1-wk treatments with placebo (PLAC), propranolol (PROP, 160 mg/day, beta 1- and beta 2-blockade), and atenolol (ATEN, 100 mg/day, beta 1-blockade). Treatments were separated by 1-wk washout periods. At 60% of control VO2max T and UT subjects experienced no reductions in O2 uptake (VO2) with either drug. Submaximal heart rate (HR, beats/min) was 134.8 PLAC, 107.0 PROP, 107.9 ATEN (P less than 0.05 both drugs vs. PLAC) in T subjects and 141.1 PLAC, 106.1 PROP, and 105.0 ATEN (P less than 0.05 both drugs vs. PLAC) in UT subjects. Cardiac output (1/min) for T was 17.3 PLAC, 16.9 PROP, 16.5 ATEN (P less than 0.05 ATEN vs. PLAC in T only) and for UT it was 12.2 (PLAC), 11.7 (PROP), 11.5 (ATEN) (P less than 0.05 both drugs vs. PLAC in UT). Stroke volume increased from 129.8 ml (PLAC) to 158.6 (PROP) and 156.2 (ATEN) in T (P less than 0.05 both drugs vs. PLAC) and from 86.8 (PLAC) to 110.0 (PROP) and 109.8 (ATEN) (P less than 0.05 both drugs vs. PLAC) in UT. The increases in stroke volume (SV) were similar in both groups.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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pubmed-article:2871007pubmed:authorpubmed-author:MartinezEElld:pubmed
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pubmed-article:2871007pubmed:pagination1429-34lld:pubmed
pubmed-article:2871007pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:2871007pubmed:year1986lld:pubmed
pubmed-article:2871007pubmed:articleTitleEffects of beta-blockade on exercise capacity of trained and untrained men: a hemodynamic comparison.lld:pubmed
pubmed-article:2871007pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:2871007pubmed:publicationTypeClinical Triallld:pubmed
pubmed-article:2871007pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:2871007pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:2871007pubmed:publicationTypeRandomized Controlled Triallld:pubmed
pubmed-article:2871007pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed