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1) Brzezińska, Z., Nazar, K., Kozłowski, S. (1980, Sep). Effect of prolonged exhausting exercise on the adrenal cortex, Acta Physiol Pol, 31(5):567-9.
2) Brooks, K., Carter, J.(2013, Feb). Overtraining, exerciseing, and adrenal insufficiency, J Nov Physiother, 3(125). pii: 11717.