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Journal of Exercise Nutrition & Biochemistry 2003;7(3):247-256.
Articles : Changes of Plasma Amino Acids Concentration During Graded Maximal Exercise and Moderate- vs High- Intensity Exercise in Men
Abstract
The purpose of this study was to examine the changes of plasma amino acid concentrations during gradual maximum exercise and moderate to high intensity exercise with male collegians. Plasma EAA concentrations showed an increase immediately after three different exercise intensify. Plasma NEAA and TAA concentrations revealed a slight decrease in 60% VO_(2)max (30 min). In contrast, They demonstrated an increase in two different exercise intensity and recovery phase. As compared to pre-exercise, plasma amino acid concentrations of post-exercise in gradual maximum exercise were decreased in valine (-2%), ornithine (-2%). proline (-1%), citruline (-8%) and 3-methylhistidine (-3%). As compared to pre-exercise, threonine (-4% ), valnine (-5%). methionine (-2%), taurine (-25%), ornithine (-3%), serine(-3%), asparagine (-2%), glutamine (-9%), proline (-3%). glycine (-15%), citruline (-42%). histidine (-7%). 3-methylhistidine (-7%) and arginine (-0.5% ) were decreased immediately after moderate intensity exercise. As compared to pre-exercise, taurine (-11%), glycine (-2%) and 3-methylhistidine (-15%) were decreased immediately after high intensity exercise. BCAA, BAA, LNAA and AAA concentrations showed an increase. whereas SCAA concentrations revealed a decrease after three different exercise intensity. As a result. It could be regarded that three different exercise intensity dole not cause an imbalnace of plasma amino acid concentrations. However, in light of an increased AAA/BCAA and Trp/BCAA ratio, it was inferred that a development of central fstigue after exercise could be possible.
Key Words: graded maximal exercise, moderate intensity, high intensity, amino acids


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