Carbohydrate supplementation attenuates muscle glycogen loss during acute bouts of resistance exercise

The effects of carbohydrate (CHO) supplementation on muscle glycogen and resistance exercise performance were examined with eight highly resistance trained males (mean +/- SEM, age: 24.3 +/- 1.1 years, height: 171.9 +/- 2.0 cm, body mass: 85.7 +/- 3.5 kg; experience 9.9 +/- 2.0 years). Subjects part...

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Bibliographic Details
Published in:International journal of sport nutrition and exercise metabolism 2000-09, Vol.10 (3), p.326-339
Main Authors: Haff, G G, Koch, A J, Potteiger, J A, Kuphal, K E, Magee, L M, Green, S B, Jakicic, J J
Format: Article
Language:English
Subjects:
Adult
Blood Glucose - metabolism
Cross-Over Studies
Dietary Carbohydrates - pharmacology
Double-Blind Method
Exercise - physiology
Fatty Acids, Nonesterified - metabolism
Glycogen - metabolism
Humans
Lactic Acid - metabolism
Male
Muscle, Skeletal - drug effects
Muscle, Skeletal - metabolism
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Summary:The effects of carbohydrate (CHO) supplementation on muscle glycogen and resistance exercise performance were examined with eight highly resistance trained males (mean +/- SEM, age: 24.3 +/- 1.1 years, height: 171.9 +/- 2.0 cm, body mass: 85.7 +/- 3.5 kg; experience 9.9 +/- 2.0 years). Subjects participated in a randomized, double blind protocol with testing sessions separated by 7 days. Testing consisted of an initial isokinetic leg exercise before and after an isotonic resistance exercise (IRT) session consisting of 3 leg exercises lasting approximately 39 min. Subjects consumed a CHO (1.0 g CHO.kg body mass(-1)) or placebo treatment (PLC), prior to and every 10-min (0.5 g CHO.kg body mass(-1)) during the IRT. Muscle tissue was obtained from the m vastus lateralis after a supine rest (REST) immediately after the initial isokinetic test (POST-ISO) and immediately after the IRT (POST-IRT). The CHO treatment elicited significantly less muscle glycogen degradation from the POST-ISO to POST-IRT (126.9 +/- 6.5 to 109.7 +/- 7.1 mmol.kg wet weight(-1)) compared to PLC (121.4 +/- 8.1 to 88.3 +/- 6. 0 mmol.kg wet weight(-1)). There were no differences in isokinetic performance between the treatments. The results of this investigation indicate that the consumption of a CHO beverage can attenuate the decrease in muscle glycogen associated with isotonic resistance exercise but does not enhance the performance of isokinetic leg exercise.
ISSN:1526-484X
1543-2742
DOI:10.1123/ijsnem.10.3.326