Laboratory studies have demonstrated that a carbohydrate mouth rinse (CMR) can increase muscle force production (Gant et al., 2010, Brain Research, 1350, 151-158) and counter reductions in muscle strength (Jensen et al., 2015, International Journal of Sport Nutrition and Exercise Metabolism, 25, 252-261). However, CMR does not appear to improve muscular strength or strength endurance using more ecologically valid protocols (Clarke et al., 2015, Journal of Strength and Conditioning Research, 29, 2926-2931; Painelli et al., 2011, European Journal of Applied Physiology, 111, 2381-2386). The efficacy of a CMR may be related to the load used during resistance exercise (Clarke et al., 2015). The aim of this study was to investigate the effect of a CMR on upper body muscular strength and endurance. Following institutional ethical approval, 12 recreationally resistance trained males (age: 22 ± 1 years, height: 1.79 ± 0.02 m, body mass: 80.9 ± 6.1 kg) (mean ± s) completed a bench press protocol comprising a 1 repetition maximum (RM) test followed by repetitions to failure at 40% of 1RM in a repeated measures, double-blind, randomised fashion. A 25 ml bolus of an 18% CMR solution or a placebo (PLA) solution was rinsed around the oral cavity for 10 seconds before 1RM testing and repetitions to failure. A no-rinse (NR) control trial was also employed. Felt arousal was measured before and after each mouth rinse, heart rate was measured before and after both protocols, and rating of perceived exertion (RPE) was recorded after repetitions to failure. Mouth rinsing did not influence 1RM (CMR 91.7 ± 18.8 kg; PLA 90.8 ± 18.3 kg, NR 91.3 ± 19.4 kg; P = 0.680, "ƞ" _p^2 = 0.034), repetitions to failure (CMR 41 ± 5 reps; PLA 40 ± 4 reps, NR 40 ± 6 reps; P = 0.677, "ƞ" _p^2 = 0.035) or exercise volume (load x reps; CMR 1479 ± 309 kg; PLA 1437 ± 264 kg, NR 1436 ± 338 kg; P = 0.600, "ƞ" _p^2 = 0.045). There was no significant effect of condition on heart rate (P = 0.677, "ƞ" _p^2 = 0.035), felt arousal (P = 0.674, "ƞ" _p^2 = 0.035) or RPE (P = 0.604, "ƞ" _p^2 = 0.045). A CMR does not improve upper body muscular strength or endurance. Practitioners and athletes seeking to improve upper body muscular strength and endurance should consider alternative strategies. However, the CMR had no negative effects.
|Conference||British Association of Sport and Exercise Sciences Annual Conference|
|City||Burton Upon Trent|
|Period||25/11/14 → 26/11/16|