Ricerca avanzata

Home > Riviste > The Journal of Sports Medicine and Physical Fitness > Fascicoli precedenti > The Journal of Sports Medicine and Physical Fitness 2003 Giugno;43(2) > The Journal of Sports Medicine and Physical Fitness 2003 Giugno;43(2):236-42

FASCICOLI E ARTICOLI   I PIÙ LETTI   eTOC

ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111

Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 2003 Giugno;43(2):236-42

BIOCHEMISTRY 

 Original articles

Variation in plasma amino acid concentrations during a cycling competition

Medelli J. 1, Lounana J. 1, Hill D. 2

1 Biology and ­Sports Med­i­cine ­Unit, CHU-­Hôpital-­Nord, ­Amiens, ­France
2 Depart­ment of Kin­e­sio­logy, Health Pro­mo­tion, and Rec­re­a­tion Uni­ver­sity of ­North ­Texas, ­Denton, ­Texas USA

Aim. The vari­a­tions in ­plasma con­cen­tra­tions of 24 amino acids (AAs) ­were meas­ured, ­taking ­into ­account mod­ifi­ca­tions in ­plasma ­volume, in 7 ­male sub­jects, pro­fes­sional ­cyclists, ­during the ­first 2 ­stages (EI and EII) of the com­pe­ti­tion “4 ­Days of Dun­kirk 1999”.
­Methods. ­Blood sam­ples ­were ­taken ­before the ­start and at the end of ­each ­stage. At the end of EI a sig­nif­i­cant reduc­tion (p<0.02) in α-ami­no­bu­tyric ­acid was ­observed (-38%) and a sig­nif­i­cant ­increase (Wil­coxon 0.01­Results. The ­recovery ­period was char­ac­ter­ised by ­increases in pre­vi­ously ­reduced AAs and ­vice ­versa.
Con­clu­sion. ­These ­results ­show ­that cel­lular use of ­plasma AAs in the endu­rance ­cyclist ­could ­differ ­between the ­first ­hours of com­pe­ti­tion and the sub­se­quent ­stages, pos­sibly in rela­tion to the ­gradual ­increase in ­stress ­level as the ­stages ­progress; ­they ­also sug­gest ­that appro­priate con­sid­er­a­tion ­should be ­given to the ­quality of pro­tein ­inputs in the nutri­tion of ­cyclists ­involved in a ­high-­level ­stage com­pe­ti­tion.

lingua: Inglese


FULL TEXT  ESTRATTI

inizio pagina