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

Published

September 2000

Topics

Carbohydrate

Newsletter Sign Up

Abstract

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 on an initial isokinetic leg exercise before and after an isotonic resistance exercise (IRT) session consisting of 3 leg exercises lasting ~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 mmolkg wet weight^-1) compared to PLC (121.4 ± 8.1 to 88.3 ± 6.0 mmolkg 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.

Int J Sport Nutr Exerc Metab. 10(3):326-339.

GSSI Newsletter Sign up

Get the latest & greatest

All fields are required