Effects of Carbohydrate, Caffeine and Guarana on Cognitive Performance, Perceived Exertion and Shooting Performance in High Level Athletes

Abstract : Purpose: This study aimed at investigating the effect of carbohydrate (CHO), caffeine (CAF) and a guarana complex (GUAc) ingestion during a running exercise on cognitive performance, ratings of perceived exertion (RPE) and shooting performance in high level Modern Pentathlon athletes. Methods: Ten athletes completed four counterbalanced sessions within a 2 week-period, corresponding to ingestions of CHO (30 g), GUAc (300 mg), CAF (200 mg) or placebo (PL). The exercise involved a 40-minuterunon a treadmill atasteady speed, previously determined as a “somewhat hard” exercise (RPE 13). Shooting and cognitive performances (Simon task) were assessed in three phases: 1) prior to exercise and ingestion, 2) prior to exercise and after half ingestion, and 3) after exercise and full ingestion. Ingestions were consumed 40 minutes (250 ml) and 5 minutes (125 ml) prior to exercise, and after 20 minutes of run (125 ml) . RPE was assessed at 10minutes intervals during exercise. Results: Results have shown an interaction between drinks and exercise on mean reaction time (p = .01, ɳp2= .41) and a drinks effect on RPE (p = .01, ɳp2= .15). CHO, CAF and GUAc enhanced the speed of information processing after exercise (respectively p = .003, p = .004 and p = .04) but only CAF and GUAc decreased RPE (respectively p = .002, p = .02). Conclusion: Our results highlight the beneficial effect of nutritional supplements on information processing and RPE. This finding is particularly interesting since decision-making processes are vitalin many sports performance.
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Laura Pomportes, Jeanick Brisswalter, Arnaud Hays, Karen Davranche. Effects of Carbohydrate, Caffeine and Guarana on Cognitive Performance, Perceived Exertion and Shooting Performance in High Level Athletes. International Journal of Sports Physiology and Performance, Human Kinetics, 2018, pp.1 - 26. ⟨10.1123/ijspp.2017-0865⟩. ⟨hal-01916094⟩

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