The influence of the adrenal cortex hormones on the catecholamine synthesis in the adrenal glands and the heart of rats following prolonged swimming (8 hours) was studied. Catecholamine synthesis after the incubation of the adrenal glands and heart in the presence of L-tyrosine was sharply inhibited
BACKGROUND
The purpose of this study was to examine the effect of acute and prolonged (4-weeks) ingestion of a supplement designed to improve reaction time and subjective measures of alertness, energy, fatigue, and focus compared to placebo.
METHODS
Nineteen physically-active subjects (17 men and 2
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