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


September 2000



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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.

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