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- aggregation classification "A1".
- aggregation creator B838419.
- aggregation creator B838420.
- aggregation creator B838421.
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- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation date "2014".
- aggregation format "application/pdf".
- aggregation hasFormat 4237170.bibtex.
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- aggregation isPartOf urn:issn:8750-7587.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Medicine and Health Sciences".
- aggregation title "Does low serum carnosinase activity favour high-intensity exercise capacity?".
- aggregation abstract "Given the ergogenic properties of carnosine in skeletal muscle, it can be hypothesized that elevated levels of circulating carnosine could equally be advantageous for high-intensity exercises. Serum carnosinase (CN1), the enzyme hydrolyzing the dipeptide, is highly active in the human circulation. Consequently, dietary intake of carnosine usually results in rapid degradation upon absorption, yet this is less pronounced in subjects with low carnosinase activity. Therefore acute carnosine supplementation prior to high-intensity exercise could be ergogenic in these subjects. In a cross sectional study, we determined plasma carnosinase (CN1) activity and content in 235 subjects, including 154 untrained controls, 45 explosive and 36 middle to long distance elite athletes. In a subsequent double-blind placebo-controlled cross-over study, 12 males performed a cycling capacity test at 110% maximal power output (CCT 110%) following acute carnosine (20 mg/kg BW) or placebo supplementation. Blood samples were collected to measure CN1 content, carnosine and acid-base balance. Both male and female explosive athletes had significantly lower CN1 activity (respectively 14 and 21 % lower) and content (30 and 33 % lower) than controls. Acute carnosine supplementation resulted only in 3 subjects in carnosinemia. The CCT 110% performance was not improved after carnosine supplementation, even not when accounting for low/high CN1 content. No differences were found in acid-base balance except for elevated resting bicarbonate following carnosine supplementation and in low CN1 subjects. In conclusion, explosive athletes have lower serum CN1 activity and content compared to untrained, possibly resulting from genetic selection. Acute carnosine supplementation does not improve high-intensity performance.".
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- aggregation similarTo japplphysiol.01218.2013.
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