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Articles in PresS, published online ahead of print July 12, 2002
J Appl Physiol, 10.1152/jap.00394.2002
Submitted on May 3, 2002
Accepted on July 2, 2002
1 Kinesiology and Health Education, University of Texas, Austin, TX, USA
2 Biology, Point Loma Nazarene University, San Diego, CA, USA
3 Diagnostic Radiology, Yale University, New Haven, CT, USA
* To whom correspondence should be addressed. E-mail: price{at}boreas.med.yale.edu.
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 to a carbohydrate supplement of equal carbohydrate content (LCHO) or caloric equivalency (HCHO). Following 2.5±0.1 hours of intense cycling to deplete the muscle glycogen stores, subjects (n = 7) received, using a rank ordered design, a CHO-PRO (80g CHO, 28g PRO, 6g fat), LCHO (80g CHO, 6g fat) or HCHO (108g CHO, 6g fat) supplement immediately (10min) and 2 hours post exercise. Before exercise and during 4 hours of recovery, muscle glycogen of the vastus lateralis was determined periodically by nuclear magnetic resonance spectroscopy. Exercise significantly reduced the muscle glycogen stores (40.9±5.9 mmol/L CHO-PRO, 41.9±5.7 mmol/L HCHO, 40.7±5.0 mmol/L LCHO mmol/L, final concentrations). Following 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 carbohydrate supplement of equal carbohydrate or caloric content.
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