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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Original articles BIOCHEMISTRY
The Journal of Sports Medicine and Physical Fitness 2003 June;43(2):236-42
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 0.01
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.