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Authors: Spyridon
Zarogiannis
Affiliations: University of
Glasgow, College of Medical, Veterinary & AMP; Life Sciences, Institute of
Cardiovascular & AMP; Medical Sciences, Glasgow, Greece
Citation: Spyridon Zarogiannis (2019), Influence of CHO Ingestion
on Exercise Performance and Fuel Utilization. Global Diabetes
Open Access Journal, 1(1);1-6
Copyright: © 2019,
Spyridon Z. This is an open-access article distributed under the terms of the
Creative Commons Attribution 4.0 International License, which permits
unrestricted use, distribution and reproduction in any medium, provided the
original author and source are credited.
ABSTRACT
Background: It is known
that CHO feeding can improve exercise performance. The aim of this study is to
assess the effect of CHO ingestion on performance and on metabolic responses
during exercise. Methods: Thirteen healthy students from
University of Glasgow completed two 1 d trials: carbohydrates and placebo
ingestion, in a randomized, double-blind, cross-over design separated by 1
week. Subjects cycled for 90 minutes at 60% of VO2max and then
at 90% of VO2max until exhaustion. They consumed a 250 ml drink
(CHO or placebo) at the beginning and every 15 minutes until the end of 90
minutes period. The CHO drink contained 12.5% of CHO and was given 6 times
during the 90 minutes of exercise (80 g·h-1; 833 ml·h-1).
Blood glucose, heart rates and RPE were taken at the beginning of the trial,
every 15 minutes and at the point of exhaustion. Expired air samples were taken
at 2-minute intervals every 15 minutes. Time to exhaustion was determined for
each trial. Results: Blood glucose levels were significantly
higher (P=0.001) in CHO trial (5.7 ± 0.6 mmol/l) compared to placebo (5.0 ± 0.4
mmol/l). Despite the differences in blood glucose levels during the exercise,
there were no significant differences in the time to exhaustion or rate of fuel
oxidation between the two trials. No significant differences were observed in
heart rates and RPE measurements. Conclusion: These data
suggest that CHO ingestion increased significantly blood glucose levels
compared to placebo, but did not change exercise performance or fuel
utilization.
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