The effects of a starch based carbohydrate alone or in combination with whey protein on a subsequent bout of exercise pe
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BioMed Central
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Poster presentation
The effects of a starch based carbohydrate alone or in combination with whey protein on a subsequent bout of exercise performance – preliminary findings Paul La Bounty*1, Matt Cooke1, Bill Campbell2, Josh Vanta1, Haleigh Mistry1, Mike Greenwood1, Rafer Lutz1 and Darryn Willoughby1 Address: 1Baylor University – Exercise and Biochemical Nutrition Laboratory, Waco, TX, USA and 2University of South Florida – Exercise and Performance Nutrition Laboratory, Tampa, FL, USA Email: Paul La Bounty* - [email protected] * Corresponding author
from 2009 International Society of Sports Nutrition Conference and Expo New Orleans, LA, USA. 14–15 June 2009 Published: 31 July 2009 Journal of the International Society of Sports Nutrition 2009, 6(Suppl 1):P13
doi:10.1186/1550-2783-6-S1-P13
Proceedings of the Sixth International Society of Sports Nutrition (ISSN) Conference and Expo
Chad Kerksick and Jose Antonio Meeting abstracts – A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/pdf/1550-2783-6-S1-info.pdfThis abstract is available from: http://www.jissn.com/content/6/S1/P13 © 2009 La Bounty et al; licensee BioMed Central Ltd.
Background High-molecular weight, starch based carbohydrates have been shown to leave the stomach faster as well as replenish muscle glycogen more rapidly as compared to lower molecular weight, monomeric glucose and short-chain glucose oligomers (Leiper, et al. 2000 and Piehl Aulin et al. 2000). Furthermore, it has been shown that Vitargo® (a high molecular weight, low osmolality starch based carbohydrate) led to a greater work-output during a 15 minute time-trial 2 hours following cycling to exhaustion when compared to maltodextrin (a low molecular weight carbohydrate) (Stephens et al. 2008). The purpose of this study was to replace a portion of a high-molecular weight carbohydrate with whey protein to determine if it could enhance muscle glycogen re-synthesis following a heavy resistance training bout and/or enhance a subsequent bout of exercise (15 min cycle ergometer time trial) 2 hours later.
Methods 10 recreationally active, fasted males (21.5 years; 178.1 cm; 79.5 kg) performed 5 sets of hack squats, 5 sets of leg press, and 5 sets of leg extension at 80% of 1 RM to failure (in attempt to reduce muscle glycogen content). Rest periods between sets and exercises were 150 seconds. Immediately following the RT bout, participants were blockrandomized to consume a 1 liter solution containing
either 1.0 g/kg of carbohydrate from Vitargo® S2 or 0.75 g/ kg of carbohydrate from Vitargo® S2 + 0.25 g/kg of a commercially available whey protein product (whey protein isolate, whey protein concentrate, and whey protein hydrolysates). Both supplements were ~ isocaloric. Exactly one week later, the participants performed the same resistance training (RT) protocol, but consumed the second solution. After consuming the supplement, the subjects rested in a semi-supine position for 2 hours.
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