Content area
Full Text
Eur J Appl Physiol (2011) 111:23812386 DOI 10.1007/s00421-011-1865-8
SHORT COMMUNICATION
The eVect of carbohydrate mouth rinse on maximal strength and strength endurance
Vitor S. Painelli Hamilton Roschel Bruno Gualano Serena Del-Favero Fabiana B. Benatti Carlos Ugrinowitsch Valmor Tricoli Antonio H. Lancha Jr
Received: 30 August 2010 / Accepted: 3 February 2011 / Published online: 19 February 2011 Springer-Verlag 2011
Abstract It has been previously reported that carbohydrate (CHO) mouth rinse can improve exercise performance. The proposed mechanism involves increased activation of brain regions believed to be responsible for reward/motivation and motor control. Since strength-related performance is aVected by central drive to the muscles, it seems reasonable to hypothesize that the positive CNS response to oral CHO sensing may counteract the inhibitory input from the muscle aVerent pathways minimizing the drop in the central drive. The purpose of the current study was to test if CHO mouth rinse aVects maximum strength and strength endurance performance. Twelve recreationally strength-trained healthy males (age24.08 2.99 years; height 178.09 6.70 cm; weight
78.67 8.17 kg) took part in the study. All of the tests
were performed in the morning, after an 8 h overnight fasting. Subjects were submitted to a maximum strength test (1-RM) and a strength endurance test (six sets until failure
at 70% of 1-RM), in separate days under three diVerent experimental conditions (CHO mouth rinse, placeboPLA mouth rinse and controlCON) in a randomized crossover design. The CHO mouth rinse (25 ml) occurred before every attempt in the 1-RM test, and before every set in the endurance strength test. Blood glucose and lactate were measured immediately before and 5 min post-tests. There were no signiWcant diVerences in 1-RM between experimental conditions (CHO 101 7.2 kg; PLA 101 7.4 kg;
CON 101 7.2 kg; p = 0.98). Furthermore, there were no
signiWcance between trial diVerences in the number of repetitions performed in each set (p = 0.99) or the total exercise volume (number of repetitions load lifted [kg])
(p = 0.98). A main eVect for time (p < 0.0001) in blood lac-tate concentration was observed in both tests (1-RM and strength endurance). Blood glucose concentration did not diVer between conditions. In conclusion, CHO mouth rinse does not aVect maximum strength or strength endurance performance.
Keywords Carbohydrate Mouth rinse Exercise...