Effect of tyrosine ingestion on cognitive and physical performance utilising an intermittent soccer performance test (iSPT) in a warm environment
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The aim of this study was to investigate the effect of tyrosine (TYR) ingestion on cognitive and physical performance during soccer-specific exercise in a warm environment.
Eight male soccer players completed an individualised 90 min soccer-simulation intermittent soccer performance test (iSPT), on a non-motorised treadmill, on two occasions, within an environmental chamber (25 °C, 40 % RH). Participants ingested tyrosine (TYR; 250 mL sugar free drink plus 150 mg kg body mass−1 TYR) at both 5 h and 1 h pre-exercise or a placebo control (PLA; 250 mL sugar free drink only) in a double-blind, randomised, crossover design. Cognitive performance (vigilance and dual-task) and perceived readiness to invest physical effort (RTIPE) and mental effort (RTIME) were assessed: pre-exercise, half-time, end of half-time and immediately post-exercise. Physical performance was assessed using the total distance covered in both halves of iSPT.
Positive vigilance responses (HIT) were significantly higher (12.6 ± 1.7 vs 11.5 ± 2.4, p = 0.015) with negative responses (MISS) significantly lower (2.4 ± 1.8 vs 3.5 ± 2.4, p = 0.013) in TYR compared to PLA. RTIME scores were significantly higher in the TYR trial when compared to PLA (6.7 ± 1.2 vs 5.9 ± 1.2, p = 0.039). TYR had no significant (p > 0.05) influence on any other cognitive or physical performance measure.
The results show that TYR ingestion is associated with improved vigilance and RTIME when exposed to individualised soccer-specific exercise (iSPT) in a warm environment. This suggests that increasing the availability of TYR may improve cognitive function during exposure to exercise-heat stress.
KeywordsCentral fatigue Tyrosine Cognitive function Intermittent exercise Heat
Central nervous system
Intermittent soccer performance test
Large neutral amino acids
Rating of perceived exertion
Readiness to invest mental/physical effort
Conflict of interest
- Aldous JW, Akubat I, Chrismas BC, Watkins SL, Mauger AR, Midgley AW, Abt G, Taylor L (2014) The reliability and validity of a soccer-specific nonmotorised treadmill simulation (intermittent soccer performance test). J Strength Cond Res 28:1971–1980. doi: 10.1519/jsc.0000000000000310
- Grafen A, Hails R, Hails R, Hails R (2002) Modern statistics for the life sciences, vol 123. Oxford University Press, OxfordGoogle Scholar
- Hillman AR, Turner MC, Peart DJ, Bray JW, Taylor L, McNaughton LR, Siegler JC (2013) A comparison of hyperhydration versus ad libitum fluid intake strategies on measures of oxidative stress, thermoregulation, and performance. Res Sports Med 21(4):305–317. doi: 10.1080/15438627.2013.825796 PubMedGoogle Scholar
- McMorris T, Swain J, Smith M, Corbett J, Delves S, Sale C, Harris RC, Potter J (2006) Heat stress, plasma concentrations of adrenaline, noradrenaline, 5-hydroxytryptamine and cortisol, mood state and cognitive performance. Int J Psychophysiol 61(2):204–215. doi: 10.1016/j.ijpsycho.2005.10.002 PubMedCrossRefGoogle Scholar
- Meeusen R, Smolders I, Sarre S, De Meirleir K, Keizer H, Serneels M, Ebinger G, Michotte Y (1997) Endurance training effects on neurotransmitter release in rat striatum: an in vivo microdialysis study. Acta Physiol Scand 159(4):335–341. doi: 10.1046/j.1365-201X.1997.00118.x PubMedCrossRefGoogle Scholar
- Neri DF, Wiegmann D, Stanny RR, Shappell SA, McCardie A, McKay DL (1995) The effects of tyrosine on cognitive performance during extended wakefulness. Aviat Space Environ Med 66:313–319Google Scholar
- Newsholme EA, Acworth IN, Blomstrand E (1987) Amino acids, brain neurotransmitters and a functional link between muscle and brain that is important in sustained exercise. In: Benzi G (ed) Advances in Myochemistry. John Libbey Eurotext, LondonGoogle Scholar
- Özgünen K, Kurdak S, Maughan R, Zeren C, Korkmaz S, Yazιcι Z, Ersöz G, Shirreffs S, Binnet M, Dvorak J (2010) Effect of hot environmental conditions on physical activity patterns and temperature response of football players. Scand J Med Sci Sports 20(s3):140–147. doi: 10.1111/j.1600-0838.2010.01219.x PubMedCrossRefGoogle Scholar
- Roelands B, Goekint M, Heyman E, Piacentini MF, Watson P, Hasegawa H, Buyse L, Pauwels F, De Schutter G, Meeusen R (2008) Acute norepinephrine reuptake inhibition decreases performance in normal and high ambient temperature. J of appl physiol 105(1):206–212. doi: 10.1152/japplphysiol.90509.2008 CrossRefGoogle Scholar
- Tumilty L, Davison G, Beckmann M, Thatcher R (2013) Acute oral administration of a tyrosine and phenylalanine-free amino acid mixture reduces exercise capacity in the heat. Eur J Appl Physiol 113:1511–1522. doi: 10.1007/s00421-012-2577-4
- Tumilty L, Davison G, Beckmann M, Thatcher R (2014) Failure of oral tyrosine supplementation to improve exercise performance in the heat. Med Sci Sports Exerc 46:1417–1425. doi: 10.1249/MSS.0000000000000243
- Watson P, Enever S, Page A, Stockwell J, Maughan RJ (2012) Tyrosine supplementation does not influence the capacity to perform prolonged exercise in a warm environment. Int J Sport Nutr Exerc Metab 22(5):363Google Scholar
- Yiannakos A, Armatas V (2006) Evaluation of the goal scoring patterns in European Championship in Portugal 2004. Int J Perform Anal Sport 6(1):178–188Google Scholar