Studies related to Vigor/Activity and L-Tyrosine

Effect Of Tyrosine Ingestion On Cognitive And Physical Performance Utilising An Intermittent Soccer Performance Test (iSPT) In A Warm Environment

Effect Increase
Values Readiness to invest physical effort. 13 ± 36 % higher for tyrosine. Figure 4, not statistically significant.
Trial Design Randomized trial
Trial Length 24 hours
Number of Subjects 8
Sex Male
Notes for this study:
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.

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