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

Watkins, Samuel L.; Coull, Nicole A.; Aldous, Jeffrey W. F.; Warren, Lee K.; Chrismas, Bryna C. R.; Mauger, Alexis R.; Taylor, Lee; Aldous, Jeffrey W F; Chrismas, Bryna C R; Abt, Grant; Watkins, Suzanne; Aldous, Jeffrey; Coull, Nicole; Dascombe, Benjamin; Mauger, Alexis; Warren, Lee

Authors

Jeffrey W. F. Aldous

Bryna C. R. Chrismas

Nicole A. Coull

Samuel L. Watkins

Jeffrey W F Aldous

Lee K. Warren

Benjamin Dascombe

Bryna C R Chrismas

Alexis R. Mauger

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Dr Grant Abt G.Abt@hull.ac.uk
Reader in Sport and Exercise Physiology and Head of Department for Sport, Health and Exercise Science

Lee Taylor

Abstract

Purpose: The aim of this study was to investigate the effect of tyrosine ingestion on cognitive and physical performance during soccer-specific exercise in a warm environment. Methods: Eight male soccer players completed an individualised 90-minute soccer-simulation (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 5h and 1h 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 v 11.5 ± 2.4, p = 0.015) with negative responses (MISS) significantly lower (2.4 ± 1.8 v 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 v 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 soccerspecific exercise (iSPT) in a warm environment. This suggests that increasing the availability of TYR may improve cognitive function during exposure to exercise-heat stress.

Journal Article Type Article
Publication Date 2015-02
Journal European journal of applied physiology
Print ISSN 1439-6319
Electronic ISSN 1439-6327
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 115
Issue 2
Pages 373-386
DOI https://doi.org/10.1007/s00421-014-3022-7
Keywords Central fatigue; Tyrosine; Cognitive function; Intermittent exercise; Heat
Publisher URL http://link.springer.com/article/10.1007/s00421-014-3022-7
Copyright Statement ©2015 University of Hull
Additional Information Author's accepted manuscript of article published in: European journal of applied physiology, 2015, v.115, issue 2. The final publication is available at Springer via http://dx.doi.org/10.1007/s00421-014-3022-7

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