Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of a combat training course.
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http://www.ncbi.nlm.nih.gov/pubmed/10230711
Conclusion of this study
The group supplied with the tyrosine-rich drink performed better on a memory and a tracking task than the group supplied with the carbohydrate-rich drink. In addition, the supplementation of tyrosine decreased systolic blood pressure. No effects on mood were found. These findings suggest that supplementation with tyrosine may, under operational circumstances characterized by psychosocial and physical stress, reduce the effects of stress and fatigue on cognitive task performance.
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