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Mental fatigue-induced decrease in levels of several plasma amino acids.

K Mizuno1, M Tanaka, S Nozaki

  • 1Department of Physiology, Osaka City University Graduate School of Medicine, Osaka, Japan.

Journal of Neural Transmission (Vienna, Austria : 1996)
|December 13, 2006
PubMed
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Mental fatigue may decrease plasma amino acid levels. Specifically, branched-chain amino acids and others like tyrosine and lysine were lower after an 8-hour mental task compared to a relaxation session.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Human Physiology

Background:

  • Mental fatigue is a common experience affecting cognitive performance.
  • Understanding the physiological markers of mental fatigue is crucial for health and productivity.
  • Previous research has not fully elucidated the relationship between specific plasma amino acid profiles and mental fatigue.

Purpose of the Study:

  • To investigate the association between plasma amino acid concentrations and the state of mental fatigue.
  • To identify specific amino acids that may serve as biomarkers for mental fatigue.

Main Methods:

  • Nine healthy volunteers underwent an 8-hour mental fatigue-inducing task session, including advanced trail making, Japanese KANA pick up, and mirror drawing tests.
  • A control session involved 8 hours of relaxation for the same participants, conducted four weeks apart.

Related Experiment Videos

  • Plasma concentrations of 20 amino acids were measured before and immediately after each session.

    • Main Results:

    • Immediately following the mental fatigue session, plasma levels of branched-chain amino acids, tyrosine, cysteine, methionine, lysine, and arginine were significantly lower compared to the relaxation session.
    • No significant differences were observed in other blood parameters such as total protein, albumin, glucose, and total cholesterol between the two sessions.
    • These findings suggest a specific pattern of amino acid depletion associated with mental fatigue.

    Conclusions:

    • Mental fatigue is physiologically characterized by a notable decrease in specific plasma amino acid levels.
    • Branched-chain amino acids, tyrosine, cysteine, methionine, lysine, and arginine may act as potential biomarkers for assessing mental fatigue.
    • Further research is warranted to explore the mechanisms underlying amino acid depletion during cognitive exertion.