Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement

Sep 18, 2002Journal of applied physiology (Bethesda, Md. : 1985)

Carbohydrate-protein supplements help muscles refill energy stores faster after exercise

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Abstract

After 240 minutes of recovery, muscle glycogen was significantly greater for the CHO-Pro treatment at 88.8 +/- 4.4 mmol/l compared to both LCHO and HCHO treatments.

Exercise significantly reduced muscle glycogen stores in all groups.
Final muscle glycogen concentrations were similar across treatments immediately after exercise.
CHO-Pro supplementation led to a significant increase in muscle glycogen compared to LCHO and HCHO.
No significant differences in plasma insulin responses were observed among the treatments.
Plasma glucose levels were significantly lower during the CHO-Pro treatment.

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In the present study, we tested the hypothesis that a carbohydrate-protein (CHO-Pro) supplement would be more effective in the replenishment of muscle glycogen after exercise compared with a carbohydrate supplement of equal carbohydrate content (LCHO) or caloric equivalency (HCHO). After 2.5 +/- 0.1 h of intense cycling to deplete the muscle glycogen stores, subjects (n = 7) received, using a rank-ordered design, a CHO-Pro (80 g CHO, 28 g Pro, 6 g fat), LCHO (80 g CHO, 6 g fat), or HCHO (108 g CHO, 6 g fat) supplement immediately after exercise (10 min) and 2 h postexercise. Before exercise and during 4 h of recovery, muscle glycogen of the vastus lateralis was determined periodically by nuclear magnetic resonance spectroscopy. Exercise significantly reduced the muscle glycogen stores (final concentrations: 40.9 +/- 5.9 mmol/l CHO-Pro, 41.9 +/- 5.7 mmol/l HCHO, 40.7 +/- 5.0 mmol/l LCHO). After 240 min of recovery, muscle glycogen was significantly greater for the CHO-Pro treatment (88.8 +/- 4.4 mmol/l) when compared with the LCHO (70.0 +/- 4.0 mmol/l; P = 0.004) and HCHO (75.5 +/- 2.8 mmol/l; P = 0.013) treatments. Glycogen storage did not differ significantly between the LCHO and HCHO treatments. There were no significant differences in the plasma insulin responses among treatments, although plasma glucose was significantly lower during the CHO-Pro treatment. These results suggest that a CHO-Pro supplement is more effective for the rapid replenishment of muscle glycogen after exercise than a CHO supplement of equal CHO or caloric content.

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Early postexercise muscle glycogen recovery is enhanced with a carbohydrate-protein supplement

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