Carbohydrate supplementation attenuates muscle glycogen loss during acute bouts of resistance exercise
2000
Haff, G.G. | Koch, A.J. | Potteiger, J.A. | Kuphal, K.E. | Magee, L.M. | Green, S.B. | Jakicic, J.J.
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.
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