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[Catecholamine excretion during physical exercise and mental performance]

M Lehmann, G Huber, M Spöri

    International Archives of Occupational and Environmental Health
    |January 1, 1982
    PubMed
    Summary
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    Adrenaline and noradrenaline excretion levels can differentiate between intense mental tasks and physical exercise. Submaximal mental exertion shows higher adrenaline excretion and a distinct adrenaline-to-noradrenaline ratio compared to physical activity.

    Area of Science:

    • Physiology
    • Biochemistry
    • Sports Science

    Context:

    • Physiological responses to physical and mental stress are crucial for understanding human performance.
    • Differentiating between physical exertion and mental performance impacts training and recovery protocols.

    Purpose:

    • To investigate and compare physiological markers, including heart rate, lactate, adrenaline, and noradrenaline, during various physical and mental tasks.
    • To identify specific biomarkers that can distinguish between higher-grade mental performance and submaximal physical exercise.

    Summary:

    • Basal and exercise-induced heart rates, lactate levels, and urinary adrenaline/noradrenaline excretions were measured across moderate and submaximal physical exercise and mental performance tasks.
    • Moderate physical and mental performances were indistinguishable using these parameters.

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  • Submaximal physical exercise and mental performance induced comparable lactate acidosis, heart rate increases, and noradrenaline excretion.
  • However, adrenaline excretion was three times higher after submaximal mental performance than physical exercise.
  • The adrenaline to noradrenaline ratio shifted from approximately 1:4 during physical exercise/moderate mental tasks to 1:2 during submaximal mental performance.

    • Impact:

    • Urinary adrenaline excretion and the adrenaline-to-noradrenaline ratio can effectively differentiate higher-grade mental performance from physical exercise.
    • These easily measurable parameters offer a non-invasive method for assessing performance type without subject discomfort.
    • Findings can inform more precise physiological assessments in sports science and occupational health.