1. Caffeine Gum Improves Reaction Time but Reduces Composure Versus Placebo During the Extra-Time Period of Simulated Soccer Match-Play in Male Semiprofessional Players.
- Author
-
Field, Adam, Corr, Liam, Birdsey, Laurence, Langley, Christina, Marshall, Ben, Wood, Greg, Hearris, Mark, Martinho, Diogo, Carbry, Christa, Naughton, Robert, Fleming, James, Mohr, Magni, Krustrup, Peter, Russell, Mark, and David Harper, Liam
- Subjects
BLOOD sugar analysis ,CAFFEINE ,REPEATED measures design ,STATISTICAL models ,SOCCER ,FOOD consumption ,EXERCISE ,T-test (Statistics) ,SENSORY perception ,STATISTICAL sampling ,BLIND experiment ,NEUROPHYSIOLOGY ,BLOOD collection ,HEMOGLOBINS ,RANDOMIZED controlled trials ,PSYCHOLOGICAL adaptation ,NEUROMUSCULAR system ,BLOOD volume determination ,OSMOLAR concentration ,DESCRIPTIVE statistics ,CHEWING gum ,VIRTUAL reality ,CROSSOVER trials ,HEART beat ,ANALYSIS of variance ,DIARY (Literary form) ,LACTATES ,HEMATOCRIT ,BLOOD plasma ,REACTION time ,BODY movement ,DIETARY carbohydrates ,BLOOD volume ,DATA analysis software ,CONFIDENCE intervals ,ERGOGENIC aids ,COGNITION ,SELF-perception ,SPRINTING ,MOTION capture (Human mechanics) ,PHARMACODYNAMICS - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF