Abstract
The influence of endurance training on the rate of uptake and levels of free amino acids in plasma and various tissues was investigated. Training decreased the uptake of α-aminoisobutyric acid into heart but not into muscle and liver. Total tissue water of muscle, heart, and liver was similar in trained and untrained animals. Training increased extracellular water in muscle but not in heart or liver. Endurance training decreased the concentrations of carnosine and phenylalanine in muscle, taurine in liver, and glutamic acid, glutamine, methionine, and taurine in plasma. However, the levels of serine in muscle, arginine, and lysine in heart, asparagine in liver, and arginine and urea in red blood cells were increased in trained animals.
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