Unaccustomed High-Mileage vs Intensity Training-Related Changes in Performance and Serum Amino Acid Levels

To test the overtraining-related "imbalanced amino acid hypothesis" (19), the influence of an unaccustomed average 103 %.4 wk-1 increase in training mileage (ITV) on performance and on serum levels of individual amino acids (AAs) was examined in distance runners and controlled by an unaccu...

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Bibliographic Details
Published in:International journal of sports medicine 1996-04, Vol.17 (3), p.187-192
Main Authors: Lehmann, M., Mann, H., Gastmann, U., Keul, J., Vetter, D., Steinacker, J. M., Häussinger, D.
Format: Article
Language:English
Subjects:
Adult
Amino Acids - blood
Arginine - blood
Asparagine - blood
Aspartic Acid - blood
Cystine - blood
Erythrocyte Count
Exercise Test
Fatigue - blood
Fatigue - physiopathology
Glycine - blood
Hematocrit
Hemoglobins - analysis
Humans
Lactates - blood
Leukocyte Count
Lysine - blood
Methionine - blood
Phenylalanine - blood
Physical Endurance - physiology
Prospective Studies
Running - physiology
Serine - blood
Taurine - blood
Training and Testing
Tryptophan - blood
Tyrosine - blood
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Summary:To test the overtraining-related "imbalanced amino acid hypothesis" (19), the influence of an unaccustomed average 103 %.4 wk-1 increase in training mileage (ITV) on performance and on serum levels of individual amino acids (AAs) was examined in distance runners and controlled by an unaccustomed average 152%.4 wk-1 increase in tempo-pace and interval runs (ITI). Two mmol.l-1 lactate performance (2 LP) increased, 4 LP stagnated and total running distance (TD) decreased in the incremental test during ITV--which may indicate an ITV-dependent overtraining--in contrast to an ITI-related increase in 2 LP, 4 LP and TD. The summed serum AAs decreased in ITV (2744 +/- 534 vs 2933 +/- 663 umol.l-1; p < 0.05) in contrast to an ITI-related increase (3541 +/- 657 vs 3252 +/- 885 umol.l-1; p < 0.05) with an average 29% higher final summed AAs concentration during ITI (p < 0.05). During ITV 12 individual AAs decreased by 6-17%, 8 remained constant and 3 increased (Cys, Met, fTrp) by 6-19%, as opposed to an ITI-related increase in 16 AA by 6-55%. The observed ITV-related changes in serum AAs profile were smaller than after completing contests as a marathon, a 100 km-run or an ultra-triathlon. It may be concluded that the observed small changes in AAs profile or AAA/BCAA and AA/LNAA ratios only represent an epiphenomenon without recognizable influence on incremental test performance, since increases in fTrp/LNAA ratios (+28% in ITV vs +45% in ITI) were found to be related both to performance impairment (ITV) and improvement (ITI).
ISSN:0172-4622
1439-3964
DOI:10.1055/s-2007-972830