The effects of a pre-exercise feeding with or without fungal carbohydrases (Carbogen) on blood parameters and exercise performance in elite cyclists: a preliminary study.
The effect of fungal carbohydrases (Carbogen[C]) consumed with a meal replacement bar (MBR) on glucose metabolism and exercise performance was determined in 5 male competitive cyclists. After a 12-hour fast, subjects performed two 60-min cycling bouts at 80% VO2max followed by a time-to-exhaustion (TE) ride at 100% VO2max. One hour prior to each cycling bout, subjects ingested a MRB + 160-mg C or 160-mg CaCO3 placebo (PL) in a double-blind, counterbalanced fashion. Blood was drawn for determination of glucose, insulin, and lactate at: fasting, 1 hour post-feeding, minutes 30 and 60 of exercise, and after TE. Two-way ANOVA revealed a significant (p <.05) treatment and time effect for glucose, with C being higher than PL. Interaction effects were observed for insulin and lactate. An increase in TE (min) at 100% VO2max was observed in the C versus PL trial (6.3 3.4 vs. 4.4 2.9, p <.001). A MRB+C may benefit cyclists due to increased BG and improved exercise performance.
Frank
Laura Lewis
LL
American Institute for Biosocial and Medical Research, PO Box 1174, Tacoma, WA 98401, USA.
Baer
Janine T
JT
Lambert
Charles P
CP
Anderson
Mark
M
D000328:Adult; D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology*; D001786:Blood Glucose / Q000378:metabolism*; D004040:Dietary Carbohydrates / Q000008:administration & dosage / Q000378:metabolism; D004311:Double-Blind Method; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006026:Glycoside Hydrolases / Q000008:administration & dosage / Q000378:metabolism* / Q000493:pharmacokinetics; D006801:Humans; D007328:Insulin / Q000097:blood; D007773:Lactates / Q000097:blood; D008297:Male; D005082:Physical Exertion
D001786:Blood Glucose; D004040:Dietary Carbohydrates; D007328:Insulin; D007773:Lactates; D006026:Glycoside Hydrolases; C019822:carbohydrase