EFFECTS OF CAFFEINE, BEETROOT JUICE AND ITS INTERACTION CONSUMPTION ON EXERCISE-RELATED FATIGUE

Authors

  • Rodrigo Ramirez-Campillo Human Performance Laboratory, Department of Physical Activity Science, Universidad de Los Lagos, Osorno, Chile; Exercise and Rehabilitation Sciences Laboratory, School of Physical Therapy, Faculty of Rehabilitation Sciences, Universidad Andres Bello, Santiago, Chile
  • Daniel Castillo Universidad de Valladolid, Soria, Spain
  • Alejandro Rodríguez-Fernández VALFIS Research Group, Institute of Biomedicine (IBIOMED), University of León, León, Spain
  • Javier Raya-González Faculty of Health Sciences, Universidad Isabel I, Burgos, Spain

Abstract

The aim of this study was to analyze the effect of different supplementation conditions on fatigue and performance in flywheel half-squat tests in senior men. Sixteen active males (age: 22.8±4.9 years; body mass index: 23.7±2.4 kg*m-2) participated in the intervention during a 4-week period. Four experimental conditions were established using a double-blind design: placebo, caffeine (CAF), beetroot juice (BRJ), and combined BRJ+CAF. To assess the effect of supplementation, participants completed a countermovement jump (CMJ) before (Pre), 30 s after (Post-30s) and 180 s after (Post-180 s) completing a flywheel half-squat exercise protocol (four sets of eight all-out repetitions, with a 3-min inter-set rest, using different inertial loads). Additionally, the mean power output during the flywheel half-squat protocol was recorded. A repeated measures ANOVA showed greater mean power (~1000 W, p<.001) produced in flywheel exercise after the CAF, BRJ and BRJ+CAF consumption compared to the placebo condition. After placebo, CAF and BRJ, CMJ performance at Post-180 s was reduced compared to Pre (p=.003-.087, two-way ANOVA; ES=-0.39/-0.49), although no significant performance reduction (p=.087) was noted after BRJ+CAF. In conclusion, compared to placebo, CAF, BRJ, and BRJ+CAF allow greater total mean power in the flywheel half-squat power test, although without effects on exercise-related fatigue. Additionally, BRJ+CAF improved recovery after a high demanding power-production protocol.

Key words: nutritional ergogenic aids, athletic performance, plyometric exercise, muscle fatigue, resistance training

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Published

2022-01-17

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Articles