Efeitos da suplementação de cafeína na força muscular e na percepção subjetiva de esforço e de dor muscular em adultos submetidos ao treinamento de força: uma revisão sistemática com metanálise

Abstract

Considering the caffeine supplementation as one of the most used ergogenic resources worldwide in the practice of high-intensity physical exercises, this undergraduate course conclusion work was elaborated, in which the theme is approached from the presentation of an article entitled “Effects of caffeine supplementation on muscle strength and the ratings of perceived exertio and muscular pain in adults submitted to strength training: a systematic review and metanalysis”, which aimed to determine the effects of caffeine supplementation on strength, in ratings of perceived exertion (RPE), and muscle pain in individuals submitted to strength training. A search of three databases was carried out to find studies on the effects mentioned above. Meta-analyses of weighted mean differences (WMD) and standardized mean differences (SMD) between caffeine and placebo trials from individual studies were performed using the random-effects model. In total, 17 studies met the inclusion criteria for meta-analyzes. Caffeine supplementation improved strength resistence (WMD 0.95 (95% confidence interval (CI): 0.38, 1.52), P = 0.001), attenuated RPE (SMD 0.41 (95% CI: 0.11, 0.70), P = 0.007) and the perception of muscle pain (SMD 0.90 (95% CI: 0.05, 1.76), P = 0.039) only in the upper body, no significant improvement in resistence in strength (WMD 0.79 (95% CI: -0.97, 2.54), P = 0.379) and RPE (SMD 0.19 (95% CI: 0.19, 0.62), P = 0.405) in the lower body. No significant results were observed at maximum strength at the top (WMD2.07(95%CI:-0.28,4.42),P=0.085) or lower (WMD5.79(95%CI:-18.11,29.68),P=0.635) of thebody. Meta-analyzes showed a significant ergogenic effect of caffeine supplementation on strength resistence, RPE and pain perception in the upper body.