Efeito imediato e 1 hora após do enxague bucal de cafeína de maneira isolada ou combinada com a ingestão sobre o desempenho de força máxima e potência muscular

Abstract

The ergogenic effects caused by the use of caffeine supplementation in low-intensity exercise are already widely accepted. However, there is still no consensus on its real effect on high-intensity exercise. The objective of the present study was to investigate the immediate effects and 1 hour after rinsing caffeine alone or combined with ingestion on the performance of maximum strength and muscular power. The research was carried out with a sample of seventeen male volunteers, trained and without injuries. The research had a randomized, double-blind and counterbalanced design. The volunteers were subjected to five experimental conditions, in which they rinsed their mouth – combined or not – with ingestion of caffeine or placebo solutions: 1) tests were carried out immediately after (ENX CAF IMMEDIATE) and 1 hour after rinsing with caffeine (ENX CAF IMMEDIATE) and 1 hour after rinsing with caffeine ( ENX COFFEE POST 1h); 2) carrying out tests immediately after (ENX PLA IMMEDIATE) and 1 hour after rinsing with placebo (ENX PLA POST 1h); 3) carrying out tests immediately after (ENX+ING CAF IMMEDIATE) and 1 hour after the combination of rinsing and caffeine ingestion (ENX+ING CAF POST 1h); 4) carrying out tests immediately after (ENX+ING PLA IMMEDIATE) and 1 hour after the combination of rinsing and placebo ingestion (ENX+ING PLA POST 1h); 5) carrying out tests immediately (IMMEDIATE CONTROL) and 1 hour later, without the use of caffeine or placebo (CONTROL POST 1h). The volunteers were instructed, depending on the condition, to rinse their mouth (25 mL) for 10 seconds, followed by ingesting a solution containing CAF (1.2% - equivalent to 300 mg) or PLA (bitter) composed of a solution of Magnesium chloride at a concentration of 33g/l (3.3%). At each visit, participants performed muscle power tests (vertical jump with countermovement and without countermovement) and muscle strength tests (maximum voluntary contraction and hand grip). The results obtained showed that the strategy of using CAF mouthwash alone or combined with ingestion did not result in an improvement in power performance and/or muscle strength. The conclusion of this study was that the use of mouthwash (25 mL) with CAF (1.2% - equivalent to 300 mg), combined or not with ingestion, was not effective in improving performance in anaerobic type exercises, either immediately or 1 hour after using the supplement.