PMID: 9189783Jun 1, 1997Paper

Glycemic and insulinemic responses to multiple preexercise carbohydrate feedings

International Journal of Sport Nutrition
K R ShortD L Costill

Abstract

This investigation was undertaken to determine whether consuming several small feedings of preexercise carbohydrate (CHO), rather than a single bolus, would affect blood glucose and insulin responses during rest and exercise. Eight trained cyclists ingested 22.5, 45, or 75 total g maltodextrin and dextrose dissolved in 473 ml of water or an equal volume of placebo (PL). Drinks were divided into four portions and consumed at 15-min intervals in the hour before a 120-min ride at 66% VO2max. Serum glucose values were elevated by the CHO feedings at rest and fell significantly below baseline and PL at 15 min of exercise. However, glucose concentrations were similar in each of the CHO trials. Insulin concentrations also increased rapidly during rest, then fell sharply at the onset of exercise. The findings demonstrate that CHO consumed within an hour before exercise, even when taken in several small feedings, can produce transient hypoglycemia near the onset of exercise. Additionally, the magnitude of the response appears to be unrelated to either the amount of CHO ingested or the insulin response.

Citations

Feb 6, 2004·Journal of Physiological Anthropology and Applied Human Science·Parco M Siu, Stephen H S Wong
Mar 19, 2002·Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquée·M Hargreaves
Jan 1, 2010·Annals of Nutrition & Metabolism·Asker E Jeukendrup, Sophie C Killer
Jun 22, 2011·The Journal of Alternative and Complementary Medicine : Research on Paradigm, Practice, and Policy·Daniele MartarelliPierluigi Pompei
Jan 4, 2018·Nutrients·Samuel P Hills, Mark Russell
Oct 17, 2017·International Journal of Sport Nutrition and Exercise Metabolism·Rachel B ParksRick L Sharp
Feb 10, 2004·Medicine and Science in Sports and Exercise·Parco M SiuSusan Chung
Feb 27, 2013·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Stephen C LaneJohn A Hawley
Apr 15, 2014·Sports Medicine·Mark Russell, Michael Kingsley
Feb 20, 2004·Journal of Sports Sciences·Mark HargreavesAsker Jeukendrup
Sep 25, 2018·Medicine and Science in Sports and Exercise·Saki KondoMitsuru Higuchi

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