In the last years a shift in amino acid profile was discussed as one reason for the development of staleness. Signs of staleness are among others susceptibility to infection and disturbances in well-being. Beside tryptophane and branched-chain amino acids (BCAA) glutamine is the most discussed amino acid (AA) in this context. Based on the hypothesis of a multifactorial genesis of staleness and these AA being the metabolic link in psychoimmunology, seven young swimmers of regional top level were examined in a longitudinal field monitoring for biochemical, biomechanical and psycho-physiological data at six different training phases across one year. Special interest was spent on phases with the highest training loads (HT I and II) because of the increased risk of appearance of staleness compared with the regeneration phase (RP). The results point out that well controlled and regulated HT does not reduce but increases the plasma levels of glutamate (means and SD; RP 20 +/- 8 micro mol/l, HT I 34 +/- 11 micro mol/l), glutamine (RP 489 +/- 155 micro mol/l, HT I 634 +/- 113 micro mol/l) and BCAA (valine RP 164 +/- 54 micro mol/l, HT I 283 +/- 58 micro mol/l, isoleucine RP 59 +/- 20 micro mol/l, HT I 101 +/- 24 micro mol/l, leucine RP 88 +/- 32 micro mol/l, HT I 142 +/- 35 micro mol/l). The immunological parameters did not show any significant training-induced changes (sIL-2-R: RP 422 +/- 98 U/ml, HT I 522 +/- 70 U/ml, s-ICAM: RP 157 +/- 11 ng/ml, HT I 185 +/- 32 ng/ml) and don't seem to be suitable as indicators for a "biochemical-psychophysiological" justified control and regulation of training. Possibly the increasing of plasma concentrations of AA by intensive and high volume endurance training is the "store shape" of AA in view of saving and provisioning the organism for further exhausting training loads.
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