Some scientists have proposed that low levels of serum-free tryptophan in conjunction with high
levels of branched-chain amino acids may be a major factor in the origin of fatigue during prolonged endurance exercise.

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The Answer of Some scientists have proposed that low levels of serum-free tryptophan in conjunction with high
levels of branched-chain amino acids may be a major factor in the origin of fatigue during prolonged endurance exercise.

Some Scientists Have Proposed That Low Levels of Serum-Free Tryptophan