The effects of repetitive exposure of rats to immobilization stress were examined in terms of alterations in body weight gain, adrenal size and plasma levels of corticosterone, fatty acids and glucose. Prestress administrations of small doses of L‐alanine, L‐tryptophan and L‐tyrosine were tested for ability to modulate the stress‐induced effects. In general, L‐alanine had no characteristic actions, L‐tryptophan exacerbated and L‐tyrosine modulated the stress effects.
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