ABSTRACT
Influence of the all out exercise by the bicycle ergometer, all out exercise by the treadmill and the 5000 meter track running on the venous and urine concentrations of amino acid with healthy male and female subjects (include junior high school boys) were tested. The subject who was observed remarkable rise in his venous concentrations of amino acids was not always rose in his urine concentration of that.<BR>Generally, increasing ratio of serum alanine concentration was small and both the serum concntrations of essential and non-essential amino acids were reduced. On the several subjects increase of essential amino acids especially branched chain amino acids were observed. It seemed to us the sign of proteolysis according with the exercise. Quite a few difference of the effect on the serum amino acid concentrations among the individuals are observed.