Oral carbohydrate rinsing has beneficial effects on endurance performance and caffeine mouth rinsing either independently or in conjunction with carbohydrate may enhance sprinting performance. However, the effects of carbohydrate and/ or caffeine mouth rinses on resistance exercise have not been examined previously. The purpose of this study was to investigate the effects of carbohydrate and/ or caffeine rinsing on maximum strength and muscular endurance performance. Fifteen recreationally resistance trained males completed an exercise protocol which involved a one repetition maximum (1-RM) bench press followed by 60% of their 1-RM to failure in a double-blind, randomised, counterbalanced crossover design. Prior to exercise either 25 ml of a 6% (15 g; 0.20+/-0.02 g[middle dot]kg-1) carbohydrate (CHO), 1.2% (300 mg; 3.9+/-0.3 mg[middle dot]kg-1) caffeine (CAF), carbohydrate with caffeine (C+C) solutions, or water (PLA) were rinsed for 10 s. During the remaining session, no solution was rinsed (CON). All solutions were flavoured with (200 mg) sucralose. Felt arousal was recorded pre- and post-rinse and rating of perceived exertion was recorded immediately after the repetitions to failure. There were no significant differences in 1-RM (P=0.808; [eta]p2=0.02), the number of repetitions performed (P=0.682; [eta]p2=0.03) or the total exercise volume (P=0.482; [eta]p2=0.03) between conditions. RPE was similar for all trials (P=0.330; [eta]p2=0.08), while Felt arousal increased as a consequence of rinsing (P=0.001; [eta]p2=0.58), but was not different between trials (P=0.335; [eta]p2=0.08). These results suggest that rinsing with a carbohydrate and caffeine solution either independently or combined has no significant effect on maximum strength or muscular endurance performance.
Bibliographical noteThis is a non-final version of an article published in final form in Clarke, N.D. , Kornilios, E. and Richardson, D.L. (2015) Carbohydrate and caffeine mouth rinses do not affect maximum strength and muscular endurance performance. Journal of Strength & Conditioning Research, volume 29 (10): 2926-2931.
- resistance exercise
- bench press