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Adrenocortical activity during meditation.

R Jevning, A F Wilson, J M Davidson

    Hormones and Behavior
    |February 1, 1978
    PubMed
    Summary
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    Transcendental Meditation (TM) practice is associated with reduced cortisol levels, indicating an acute inhibition of pituitary-adrenal activity in long-term practitioners. Testosterone levels remained unchanged during TM or rest.

    Area of Science:

    • Endocrinology
    • Psychophysiology
    • Neuroscience

    Background:

    • The physiological effects of Transcendental Meditation (TM) are of interest, particularly concerning stress response systems.
    • Cortisol and testosterone are key hormones involved in the body's stress response and endocrine regulation.

    Purpose of the Study:

    • To investigate acute changes in plasma cortisol and testosterone concentrations during Transcendental Meditation (TM) practice.
    • To compare these changes between novice and long-term TM practitioners and control subjects.

    Main Methods:

    • Three groups of young adult volunteers were studied: controls, individuals 3-4 months into TM practice, and long-term (3-5 years) TM practitioners.
    • Plasma cortisol and testosterone levels were measured during rest and during TM practice (for practitioners).

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    Main Results:

    • No significant changes in cortisol or testosterone were observed in controls during rest.
    • Cortisol levels showed a non-significant decline in individuals after 3-4 months of TM practice.
    • Significant decreases in cortisol were observed in long-term TM practitioners during meditation, with levels remaining low afterward.
    • Testosterone concentrations did not change significantly in any group during rest or TM.

    Conclusions:

    • Transcendental Meditation practice is associated with acute inhibitory effects on the pituitary-adrenal axis, particularly in long-term practitioners.
    • These findings suggest that TM may modulate the physiological stress response.