We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Effect of Various Carbohydrate-Electrolyte Fluids on Cycling Performance and Maximal Voluntary Contraction.
- Authors
Ganio, Matthew S.; Klau, Jennifer F.; Lee, Elaine C.; Yeargin, Susan W.; McDermott, Brendon P.; Buyckx, Maxime; Maresh, Carl M.; Armstrong, Lawrence E.
- Abstract
The purpose of this study was to compare the effects of a carbohydrate-electrolyte plus caffeine, carnitine, taurine, and B vitamins solution (CE+) and a carbohydrate-electrolyte-only solution (CE) vs. a placebo solution (PLA) on cycling performance and maximal voluntary contraction (MVC). In a randomized, double-blind, crossover, repeated-measures design, 14 male cyclists (M ± SD age 27 ± 6 yr, VO2max60.4 ± 6.8 ml · kg-1 · min-1) cycled for 120 min submaximally (alternating 61% ± 5% and 75% ± 5% VO 2max) and then completed a 15-min performance trial (PT). Participants ingested CE+, CE, or PLA before (6 ml/kg) and every 15 min during exercise (3 ml/kg). MVC was measured as a single-leg isometric extension (70° knee flexion) before (pre) and after (post) exercise. Rating of perceived exertion (RPE) was measured throughout. Total work accumulated (KJ) during PT was greater (p < .05) in CE+ (233 ± 34) than PLA (205 ± 52) but not in CE (225 ± 39) vs. PLA. MVC (N) declined (p < .001) from pre to post in PLA (988 ± 213 to 851 ± 191) and CE (970 ± 172 to 870 ± 163) but not in CE+ (953 ± 171 to 904 ± 208). At Minutes 60, 90, 105, and 120 RPE was lower in CE+ (14 ± 2, 14 ± 2, 12 ± 1, 15 ± 2) than in PLA (14 ± 2, 15 ± 2, 14 ± 2, 16 ± 2; p < .001). CE+ resulted in greater total work than PLA. CE+, but not PLA or CE, attenuated pre-to-post MVC declines. Performance increases during CE+ may have been influenced by lower RPE and greater preservation of leg strength during exercise in part as a result of the hypothesized effects of CE+ on the central nervous system and skeletal muscle.
- Subjects
SPORTS drinks; ENDURANCE sports training; CYCLING training; ENERGY drinks; ERGOGENIC aids; ENDURANCE athletes
- Publication
International Journal of Sport Nutrition & Exercise Metabolism, 2010, Vol 20, Issue 2, p104
- ISSN
1526-484X
- Publication type
Article
- DOI
10.1123/ijsnem.20.2.104