Alterations in amino acid concentrations in the plasma and muscle in human subjects during 24 h of simulated adventure racing

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Fältnamn	Indikatorer	Metadata
000		04805naa a2200601 4500
001		oai:DiVA.org:gih-1742
003		SwePub
008		110207s2012 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
009		oai:prod.swepub.kib.ki.se:125274858
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-17422 URI
024	7	a https://doi.org/10.1007/s00421-012-2350-82 DOI
024	7	a http://kipublications.ki.se/Default.aspx?queryparsed=id:1252748582 URI
040		a (SwePub)gihd (SwePub)ki
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Borgenvik, Marcusu Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp4 aut0 (Swepub:gih)marcusb
245	1 0	a Alterations in amino acid concentrations in the plasma and muscle in human subjects during 24 h of simulated adventure racing
264		c 2012-02-18
264	1	b Springer Science and Business Media LLC,c 2012
338		a print2 rdacarrier
520		a 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.
650	7	a MEDICIN OCH HÄLSOVETENSKAPx Medicinska och farmaceutiska grundvetenskaperx Fysiologi0 (SwePub)301062 hsv//swe
650	7	a MEDICAL AND HEALTH SCIENCESx Basic Medicinex Physiology0 (SwePub)301062 hsv//eng
650	7	a MEDICIN OCH HÄLSOVETENSKAPx Hälsovetenskapx Näringslära0 (SwePub)303042 hsv//swe
650	7	a MEDICAL AND HEALTH SCIENCESx Health Sciencesx Nutrition and Dietetics0 (SwePub)303042 hsv//eng
650	7	a MEDICIN OCH HÄLSOVETENSKAPx Hälsovetenskapx Idrottsvetenskap0 (SwePub)303082 hsv//swe
650	7	a MEDICAL AND HEALTH SCIENCESx Health Sciencesx Sport and Fitness Sciences0 (SwePub)303082 hsv//eng
653		a Adventure racing
653		a branched-chained amino acids
653		a creatine kinase
653		a phenylalanine
653		a skeletal muscle
653		a tyrosine
653		a Physiology
653		a Fysiologi
653		a Nutrition
653		a Näringslära
653		a Sports
653		a Idrott
653		a Medicin/Teknik
653		a Medicine/Technology
700	1	a Nordin, Marieu Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp4 aut0 (Swepub:gih)marieno
700	1	a Mattsson, C. Mikaelu Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp4 aut0 (Swepub:gih)mikaelm
700	1	a Enqvist, Jonas K.u Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp4 aut0 (Swepub:gih)jonase
700	1	a Blomstrand, Evau Gymnastik- och idrottshögskolan,Eva Blomstrands forskningsgrupp4 aut0 (Swepub:gih)evab
700	1	a Ekblom, Björnu Gymnastik- och idrottshögskolan,Björn Ekbloms forskningsgrupp4 aut0 (Swepub:gih)bjorne
710	2	a Gymnastik- och idrottshögskolanb Björn Ekbloms forskningsgrupp4 org
773	0	t European Journal of Applied Physiologyd : Springer Science and Business Media LLCg 112, s. 3679-3688q 112<3679-3688x 1439-6319x 1439-6327
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-1742
856	4 8	u https://doi.org/10.1007/s00421-012-2350-8
856	4 8	u http://kipublications.ki.se/Default.aspx?queryparsed=id:125274858

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By the author/editor: Borgenvik, Marcu ...; Nordin, Marie; Mattsson, C. Mik ...; Enqvist, Jonas K ...; Blomstrand, Eva; Ekblom, Björn

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