Caffeine Gum Improves Reaction Time but Reduces Composure Versus Placebo During the Extra-Time Period of Simulated Soccer Match-Play in Male Semiprofessional Players

Adam Field; Liam D. Corr; Laurence Birdsey; Christina Langley; Ben Marshall; Greg Wood; Mark Hearris; Diogo V. Martinho; Christa Carbry; Robert J. Naughton; James Fleming; Magni Mohr; Peter Krustrup; Mark Russell; Liam D. Harper

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Caffeine Gum Improves Reaction Time but Reduces Composure Versus Placebo During the Extra-Time Period of Simulated Soccer Match-Play in Male Semiprofessional Players

Adam Field ^[1] ; Liam D. Corr ^[2] ; Laurence Birdsey ^[1] ; Christina Langley ^[1] ; Ben Marshall ^[1] ; Greg Wood ^[1] ; Mark Hearris ^[1] ; Diogo V. Martinho ^[3] ; Christa Carbry ^[1] ; Robert J. Naughton ^[7] ; James Fleming ^[4] ; Magni Mohr ^[5] ; Peter Krustrup ^[5] ; Mark Russell ^[6] ; Liam D. Harper ^[1]
1. [1] Manchester Metropolitan University
  
  Manchester Metropolitan University
  
  Reino Unido
2. [2] Cardiff Metropolitan University
  
  Cardiff Metropolitan University
  
  Castle, Reino Unido
3. [3] Universidade de Coimbra
  
  Universidade de Coimbra
  
  Coimbra (Sé Nova), Portugal
4. [4] St. Mary's University
  
  St. Mary's University
  
  Canadá
5. [5] University of Southern Denmark
  
  University of Southern Denmark
  
  Dinamarca
6. [6] Leeds Trinity University
  
  Leeds Trinity University
  
  Reino Unido
7. [7] Robins High Performance Centre, Bristol City Football Club, Bristol, United Kingdom
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Localización: International journal of sport nutrition and exercise metabolism, ISSN 1526-484X, ISSN-e 1543-2742, Vol. 34, Nº. 5, 2024, págs. 286-297
Idioma: inglés
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Resumen
- This study aimed to determine whether caffeine gum influenced perceptual-cognitive and physical performance during the extra-time period of simulated soccer match-play. Semiprofessional male soccer players (n = 12, age: 22 ± 3 years, stature: 1.78 ± 0.06 m, mass: 75 ± 9 kg) performed 120-min soccer-specific exercise on two occasions. In a triple-blind, randomized, crossover design, players chewed caffeinated (200 mg; caffeine) or control (0 mg; placebo) gum for 5 min following 90 min of soccer-specific exercise. Perceptual-cognitive skills (i.e., passing accuracy, reaction time, composure, and adaptability) were assessed using a soccer-specific virtual reality simulator, collected pre- and posttrial. Neuromuscular performance (reactive-strength index, vertical jump height, absolute and relative peak power output, and negative vertical displacement) and sprint performance (15 and 30 m) were measured at pretrial, half-time, 90 min, and posttrial. Caffeine gum attenuated declines in reaction time (pre: 90.8 ± 0.8 AU to post: 90.7 ± 0.8 AU) by a further 4.2% than placebo (pre: 92.1 ± 0.8 AU to post: 88.2 ± 0.8 AU; p < .01). Caffeine gum reduced composure by 4.7% (pre: 69.1 ± 0.8 AU to post: 65.9 ± 0.8 AU) versus placebo (pre: 68.8 ± 0.8 AU to post: 68.3 ± 0.8 AU; p < .01). Caffeine gum did not influence any other variables (p > .05). Where caffeine gum is consumed by players prior to extra-time, reaction time increases but composure may be compromised, and neuromuscular and sprint performance remain unchanged. Future work should assess caffeine gum mixes with substances like L-theanine that promote a relaxed state under stressful conditions.