Abstract
The effects of skin illumination on plasma catecholamines were tested in the rabbit. The values observed for epinephrine, nor-epinephrine and dopamine, dosed by the radioenzymatic technique, were in accordance with those generally published. However, variability is important. Discontinuous skin illumination significantly increased (P≤0.05) only the level of dopamine in plasma. No evident demonstration can explain this elevation, but the role of the important interrelations between L-dopa, involved in melanogenic activity, and dopamine is discussed as the first step in the understanding of such a phenomenon.
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