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pubmed-article:4030586pubmed:abstractTextThe effect of beta-adrenoceptor blockade (beta B) on muscle release and uptake of H+ and K+ in humans during maximal exercise has been investigated. Eight volunteers cycled intermittently at power outputs corresponding to 100% of maximal O2 uptake. Prior to exercise either propranolol (beta B) or saline (control) was infused into the femoral vein. Arterial and femoral venous blood samples were drawn at rest, during exercise, and during 30-min recovery. Peak arterial blood values for K+, lactic acid (LA), and base deficit (BD) (mean +/- SE) were respectively 5.5 +/- 0.1, 9.5 +/- 0.6, and 11.7 +/- 0.9 mmol/l during beta B and 5.1 +/- 0.1, 8.3 +/- 0.6, and 10.3 +/- 1.0 for control (P less than 0.05). The release of K+ from the working leg did not differ between treatments during exercise, but K+ uptake during late recovery (5-30 min) was slightly lower during beta B. Thus the higher arterial K+ levels during exercise (beta B) cannot be attributed to greater release by active muscle but are likely due to decreased K+ uptake by noncontracting muscle. Arterial-femoral venous differences for LA and BD did not differ significantly between treatments. Additionally LA exchange across the leg was similar to H+ exchange (arterial-femoral venous differences for BD) under all conditions. During early recovery (1-5 min), regardless of experimental treatment, BD levels iin arterial blood were higher than LA (P less than 0.05). These elevated BD levels may be due to unequal removal rates between LA and H+ equivalents by nonexercised tissue.(ABSTRACT TRUNCATED AT 250 WORDS)lld:pubmed
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