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Alterations in amin...
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Borgenvik, MarcusGymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp
(författare)
Alterations in amino acid concentrations in the plasma and muscle in human subjects during 24 h of simulated adventure racing
- Artikel/kapitelEngelska2012
Förlag, utgivningsår, omfång ...
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2012-02-18
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Springer Science and Business Media LLC,2012
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:gih-1742
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https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-1742URI
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https://doi.org/10.1007/s00421-012-2350-8DOI
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http://kipublications.ki.se/Default.aspx?queryparsed=id:125274858URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:art swepub-publicationtype
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This investigation was designed to evaluate changes in plasma and muscle levels of free amino acids during an ultra-endurance exercise and following recovery. Nine male ultra-endurance trained athletes participated in a 24-h standardized endurance trial with controlled energy intake. The participants performed 12 sessions of running, kayaking and cycling (4 x each discipline). Blood samples were collected before, during and after exercise, as well as after 28 h of recovery. Muscle biopsies were taken 1 week before the test and after exercise, as well as after 28 h of recovery. During the 24-h exercise, plasma levels of branched-chain (BCAA), essential amino acids (EAA) and glutamine fell 13%, 14% and 19% (P<0.05) respectively, whereas their concentrations in muscle were unaltered. Simultaneously, tyrosine and phenylalanine levels rose 38% and 50% (P<0.05) in the plasma and 66% and 46% (P<0.05) in muscle, respectively. After the 24-h exercise, plasma levels of BCAA were positively correlated with muscle levels of glycogen (r2=0.73, P<0.05), as was the combined concentrations of muscle tyrosine and phenylalanine with plasma creatine kinase (r2=0.55, P<0.05). Following 28-h of recovery, plasma and muscle levels of amino acids had either returned to their initial levels or were elevated. In conclusion, ultra-endurance exercise caused significant changes elevations in plasma and muscle levels of tyrosine and phenylalanine, which suggest an increase in net muscle protein breakdown during exercise. There was a reduction in plasma concentrations of EAA and glutamine during exercise, whereas no changes were detected in their muscle concentration after exercise.
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Sammanhörande titlar
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Ingår i:European Journal of Applied Physiology: Springer Science and Business Media LLC112, s. 3679-36881439-63191439-6327
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