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European Journal of Applied Physiology

, Volume 115, Issue 2, pp 373–386 | Cite as

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

  • Nicole A. Coull
  • Samuel L. Watkins
  • Jeffrey W. F. Aldous
  • Lee K. Warren
  • Bryna C. R. Chrismas
  • Benjamin Dascombe
  • Alexis R. Mauger
  • Grant Abt
  • Lee TaylorEmail author
Original Article

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.

Keywords

Central fatigue Tyrosine Cognitive function Intermittent exercise Heat 

Abbreviations

5-HT

Serotonin

CNS

Central nervous system

DA

Dopamine

HR

Heart rate

iSPT

Intermittent soccer performance test

LNAA

Large neutral amino acids

NA

Noradrenaline

NMT

Non-motorised treadmill

PLA

Placebo

RH

Relative humidity

RPE

Rating of perceived exertion

RTIME/RTIPE

Readiness to invest mental/physical effort

TSS

Thermal sensation

TYR

Tyrosine

Notes

Conflict of interest

None.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Nicole A. Coull
    • 1
  • Samuel L. Watkins
    • 1
  • Jeffrey W. F. Aldous
    • 1
  • Lee K. Warren
    • 1
  • Bryna C. R. Chrismas
    • 1
  • Benjamin Dascombe
    • 2
  • Alexis R. Mauger
    • 3
  • Grant Abt
    • 4
  • Lee Taylor
    • 1
    Email author
  1. 1.Department of Sport Science and Physical Activity, Institute for Sport and Physical Activity Research (ISPAR)University of BedfordshireBedfordUK
  2. 2.Applied Sports Science and Exercise Testing (ASSET) Laboratory, Faculty of Science and ITUniversity of NewcastleCallaghanAustralia
  3. 3.Endurance Research Group, School of Sport and Exercise SciencesUniversity of KentChatham MaritimeUK
  4. 4.Department of Sport, Health and Exercise ScienceUniversity of HullHullUK

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