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, VO2max 60.4 ± 6.8 ml · kg−1 · min−1) cycled for 120 min submaximally (alternating 61% ± 5% and 75% ± 5% VO2max) 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.
Search Results
Effect of Various Carbohydrate-Electrolyte Fluids on Cycling Performance and Maximal Voluntary Contraction
Matthew S. Ganio, Jennifer F. Klau, Elaine C. Lee, Susan W. Yeargin, Brendon P. McDermott, Maxime Buyckx, Carl M. Maresh, and Lawrence E. Armstrong
The Effect of 1 Week of a Multi-ingredient Dietary Preworkout Supplement on Resting and Postacute Resistance Exercise Vascular Function
Austin T. Robinson, Adriana Mazzuco, Ahmad S. Sabbahi, Audrey Borghi-Silva, and Shane A. Phillips
doi:10.1055/s-2006-924290 Heffernan , K.S. , Rossow , L. , Jae , S.Y. , Shokunbi , H.G. , Gibson , E.M. , & Fernhall , B. ( 2006 ). Effect of single-leg resistance exercise on regional arterial stiffness . European Journal of Applied Physiology, 98 ( 2 ), 185 – 190 . PubMed ID
Co-Ingestion of Branched-Chain Amino Acids and Carbohydrate Stimulates Myofibrillar Protein Synthesis Following Resistance Exercise in Trained Young Men
Sarah R. Jackman, Gareth A. Wallis, Jinglei Yu, Andrew Philp, Keith Baar, Kevin D. Tipton, and Oliver C. Witard
later, each participant returned to the laboratory to confirm their single-leg 1RM. Two or 3 days later, participants performed their first blinded trial in which they consumed either a BCAA and CHO containing beverage (B + C) or a CHO only (CON) beverage (GlaxoSmithKline; Table 1 ). Participants
Adding Fish Oil to Whey Protein, Leucine, and Carbohydrate Over a Six-Week Supplementation Period Attenuates Muscle Soreness Following Eccentric Exercise in Competitive Soccer Players
Jordan D. Philpott, Chris Donnelly, Ian H. Walshe, Elizabeth E. MacKinley, James Dick, Stuart D.R. Galloway, Kevin D. Tipton, and Oliver C. Witard
’ (200 mm anchor point). Soreness was defined by measuring the distance from the 0 mm anchor point. Muscle Function A single leg isokinetic/eccentric maximum voluntary contraction (MVC) of the knee flexors was used to assess muscle function. Participants were seated on the dynamometer with their upper
Acute Effect of Citrulline Malate on Repetition Performance During Strength Training: A Systematic Review and Meta-Analysis
Fredrik Tonstad Vårvik, Thomas Bjørnsen, and Adam M. Gonzalez
Chappell et al. (2018a , 2018b ). The lack of benefit may have been impacted by a lack of familiarization with the isokinetic single-leg knee extension machine ( Chappell et al., 2018a ) and the use of single-joint exercises ( Chappell et al., 2018a , 2018b ). The possible discrepancies between single
Abstracts From the December 2017 International Sports and Exercise Nutrition Conference in Newscastle upon Tyne
of CM or a placebo one hour before participating in a German Volume Training (GVT) exercise protocol. The GVT protocol consisted of 10 sets of 10 repetitions of single leg, leg extensions, with one minutes rest between sets using an isokinetic dynamometer. Each set was ended when full range of motion
