Effects Of Tyrosine Supplementation On Anaerobic Performance And Plasma Catecholamine Concentrations Of Football Athletes

Purpose:To consider if simple exercise and training would not take athletes into best competitive condition with others, for scientific sports training, and if scientifically rational use of nutritional supplements could improve the efficiency of the athlete’s training, enhance athletes tolerated maximal loading of exercise time, delay fatigue time, and ultimately improve the athlete’s athletic ability. Tyrosine is known as the precursor of the catecholamine neurotransmitters. Related research confirmed increasing concentration of plasma tyrosine levels would drop the concentration ratio of plasma tryptophan and tyrosine, improving excitement of nervous system to help delaying the generation of sports fatigue. The purpose of this study is to observing the influence of2-week tyrosine supplement on plasma catecholamine concentration and athletes’ anaerobic performance.Method:Randomized, single-blind and crossover experiment design was used in the test.14Male Asian football players were randomly divided into A and B Groups (randomly supplied placebo capsules or tyrosine capsules for2weeks).Blood samples were collected before and after2weeks of capsule supplement, followed by anaerobic capacity test, and venous blood samples were collected again immediately after anaerobic test. Capsule supplement was stopped for three weeks, and the two groups of subjects exchanged taking tyrosine and placebo capsules, and repeated the test.Results:(1)Before and after the2-week oral taking capsules, no significant difference was found between the two groups in anaerobic capacity;(2) Blood lactate and heart rate within Pre-exercise state, immediately after exercise,3minutes after exercise and6minutes after exercise were significantly different in placebo and tyrosine groups, but no significant difference between two groups;(3)Blood glucose within pre-exercise state, immediately after exercise,3minutes after exercise and6minutes after exercise were no significantly different in placebo and tyrosine groups, also no significant difference between groups;(4) plasma catecholamine concentrations of subjects were significantly elevated immediately after exercise, but before and after taking tyrosine pre-exercise state, immediately after exercise plasma norepinephrine and dopamine concentrations were not significantly changed, epinephrine concentration decreased significantly immediately after exercise.Conclusion:(1) Two weeks tyrosine supplement did not change body composition of subjects;(2) Two weeks tyrosine supplement did not impact subjects anaerobic capacity;(3) Two weeks tyrosine supplement for athletes pre-exercise state catecholamine concentrations were not affected;(4)Two weeks tyrosine supplement for athletes immediately after exercise did not affected concentration of plasma noradrenaline and dopamine, but concentration of plasma adrenaline decreased immediately after anaerobic exercise..