Effects of tyrosine supplementation ration on anaerobic sports capacity and plasma catecholamine levels in soccer athletes
Notes for this study:
| Effect | None |
| Values | Wingate test. mmol/l. Mean and SEM. Pre-exercise. Placebo: before 5.21 ± 0.20, after 5.44 ± 0.25. Tyrosine: before 5.12 ± 0.19, after 5.47 ± 0.29. Post-0. Placebo: before 4.92 ± 0.13, after 5.23 ± 0.14. Tyrosine: before 5.25 ± 0.24, after5.13 ± 0.20. Post-3: Placebo: before 5.16 ± 0.22 , after 4.91 ± 0.15. Tyrosine: before 5.24 ± 0.23, after 5.01 ± 0.14. Post-6: Placebo: before 5.18 ± 0.18, after 4.99 ± 0.12. Tyrosine: before 5.21 ± 0.25, after 4.90 ± 0.19 |
| Trial Design | randomized |
| Trial Length | 12weeks |
| Number of Subjects | 14 |
| Sex | m |
In this randomized, single-blind crossover trial, 14 soccer players took 2 g of tyrosine daily or placebo for 2 weeks before crossing over. On a Wingate cycling test, tyrosine failed to produce improvements in peak power, power maintenance, and mean power. Were wasn't a statistically significant difference in heart rate, lactic acid, blood glucose, noradrenaline, or dopamine. Epinephrine was reduced more when taking tyrosine for those who took it first but not those who took it second.Funding issues for this study:
Not declared.
