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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 ...

  • 2012-02-18
  • Springer Science and Business Media LLC,2012
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:gih-1742
  • https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-1742URI
  • https://doi.org/10.1007/s00421-012-2350-8DOI
  • http://kipublications.ki.se/Default.aspx?queryparsed=id:125274858URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • 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.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Nordin, MarieGymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp(Swepub:gih)marieno (författare)
  • Mattsson, C. MikaelGymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp(Swepub:gih)mikaelm (författare)
  • Enqvist, Jonas K.Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp(Swepub:gih)jonase (författare)
  • Blomstrand, EvaGymnastik- och idrottshögskolan,Eva Blomstrands forskningsgrupp(Swepub:gih)evab (författare)
  • Ekblom, BjörnGymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp(Swepub:gih)bjorne (författare)
  • Gymnastik- och idrottshögskolanBjörn Ekbloms forskningsgrupp (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:European Journal of Applied Physiology: Springer Science and Business Media LLC112, s. 3679-36881439-63191439-6327

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