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    Effect of tyrosine ingestion on cognitive and physical performance utilising an intermittent soccer performance test (iSPT) in a warm environment

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    Authors
    Coull, Nicole
    Watkins, Samuel L.
    Aldous, Jeffrey William Frederick
    Warren, Lee K.
    Chrismas, Bryna C.
    Dascombe, Ben
    Mauger, Alexis R.
    Abt, Grant
    Taylor, Lee
    Issue Date
    2014-10-19
    Subjects
    athletic performance
    tyrosine
    
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    Abstract
    Abstract Purpose 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. Methods 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. Results 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. Conclusion 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.
    Citation
    Coull NA, Watkins SL, Aldous JWF, Warren LK, Chrismas BCR, Dascombe B, Mauger AR, Abt G, Taylor L (2015) 'Effect of tyrosine ingestion on cognitive and physical performance utilising an intermittent soccer performance test (iSPT) in a warm environment', European Journal of Applied Physiology, 115 (2), pp.373-386.
    Publisher
    Springer
    Journal
    European Journal of Applied Physiology
    URI
    http://hdl.handle.net/10547/624294
    DOI
    10.1007/s00421-014-3022-7
    Additional Links
    https://link.springer.com/article/10.1007/s00421-014-3022-7
    Type
    Article
    Language
    en
    ISSN
    1439-6319
    EISSN
    1439-6327
    ae974a485f413a2113503eed53cd6c53
    10.1007/s00421-014-3022-7
    Scopus Count
    Collections
    Sport and physical activity

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