| Effect | None |
| Trial Design | Randomized trial |
| Trial Length | 24 hours |
| Number of Subjects | 8 |
| Sex | Male |
In this randomized, double-blind crossover trial, 8 male soccer players took 150 mg of tyrosine per kg of body mass or placebo prior to exercise and cognitive testing.
There wasn't a difference in distance covered during the soccer performance test. Readiness to invest physical effort wasn't different. There wasn't a notable difference in accuracy on a vigilance test, though participants were less likely to miss a queue.
There wasn't a difference for hydration, heart rate, or body heat.
