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Re: [RC] Ed, Let's discuss this paper - Jon . LindermanFYI: You can find very similar results in a an equine paper published out of Ken Hinchcliff's group at Ohio State (Glycemic index of a meal fed before exercise alters substrate use and glucose flux in exercising horses. Jose-Cunilleras, Eduard; Hinchcliff, Kenneth W; Sams, Richard A; Devor, Steven T; Linderman, Jon K Journal of applied physiology vol. 92, no. 1 (2002 Jan): 117-28). In fact high glycemic meals repeatedly do the same thing in all species I've worked with (dogs, rats, horses, and the lowly human): increase insulin, increase glycogen storage (a primary path for glucose disposal), increase rate of disposal of glucose, decrease hepatic glucose production, decrease glycogen use during exercise, and may lead to lower plasma glucose concentrations during exercise. Look up David Wasserman to see these identical results in dogs for years, George Brooks and others in rats and humans, etc. I make no claim to understand the equine digestive system.........past that glucose metabolism and muscle metabolism is virtually the same in all mammalian species. You want altitude physiology/metabolism look up Brooks for the most state of the art, then see the identical results in horses out of the CalPoly Pamona people who took arabs to altitude, and mules too if I'm not mistaken. Physiology is physiology. Jon K. Linderman, Ph.D., FACSM
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Assistant Professor of Health and Sport Science University of Dayton 300 College Park Dayton, OH 45469-1210 Voice:(937) 229-4207 FAX: (937) 229-4244 http://homepages.udayton.edu/~lindermj/ To: <ridecamp@xxxxxxxxxxxxx> From: Ridecamp Guest <guest-owner@xxxxxxxxxxxxxxxxx> Sent by: ridecamp-owner@xxxxxxxxxxxxxxxxx Date: 08/07/2005 11:15AM Subject: [RC] Ed, Let's discuss this paper Please Reply to: ti tivers@xxxxxxx or ridecamp@xxxxxxxxxxxxx ========================================== J Appl Physiol 99: 707-714, 2005. First published April 14, 2005; doi:10.1152/japplphysiol.01261.2004 8750-7587/05 $8.00 This Article Ingestion of a high-glycemic index meal increases muscle glycogen storage at rest but augments its utilization during subsequent exercise Shiou-Liang Wee,1 Clyde Williams,1 Kostas Tsintzas,2 and Leslie Boobis3 1Sports and Exercise Nutrition Research Group, School of Sport and Exercise Sciences, Loughborough University, Loughborough; 2Centre for Integrated Systems Biology and Medicine, School of Biomedical Sciences, Nottingham University, Nottingham; and 3Sunderland Royal Hospital, Sunderland, United Kingdom Submitted 8 November 2004 ; accepted in final form 12 April 2005 The aim of this study was to compare the effect of preexercise breakfast containing high- and low-glycemic index (GI) carbohydrate (CHO) (2.5g CHO/kg body mass) on muscle glycogen metabolism. On two occasions, 14 days apart, seven trained men ran at 71% maximal oxygen uptake for 30 min on a treadmill. Three hours before exercise, in a randomized order, subjects consumed either isoenergetic high- (HGI) or low-GI (LGI) CHO breakfasts that provided (per 70 kg body mass) 3.43 MJ energy, 175 g CHO, 21 g protein, and 4 g fat. The incremental areas under the 3-h plasma glucose and serum insulin response curves after the HGI meal were 3.9- (P < 0.05) and 1.4-fold greater (P < 0.001), respectively, than those after the LGI meal. During the 3-h postprandial period, muscle glycogen concentration increased by 15% (P < 0.05) after the HGI meal but remained unchanged after the LGI meal. Muscle glycogen utilization during exercise was greater in the HGI (129.1 ± 16.1 mmol/kg dry mass) compared with the LGI (87.9 ± 15.1 mmol/kg dry mass; P < 0.01) trial. Although the LGI meal contributed less CHO to muscle glycogen synthesis in the 3-h postprandial period compared with the HGI meal, a sparing of muscle glycogen utilization during subsequent exercise was observed in the LGI trial, most likely as a result of better maintained fat oxidation. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Ridecamp is a service of Endurance Net, http://www.endurance.net. Information, Policy, Disclaimer: http://www.endurance.net/Ridecamp Subscribe/Unsubscribe http://www.endurance.net/ridecamp/logon.asp Ride Long and Ride Safe!! =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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