Journal
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
Volume 40, Issue 10, Pages 1789-1794Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1249/MSS.0b013e31817e0f7e
Keywords
EXERCISE RECOVERY; CARBOHYDRATE SUPPLEMENTATION; ABSORPTION; LACTATE
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Funding
- Glaxo-SmithKline Consumer Healthcare, United Kingdom
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WALLIS, G. A., C. J. HULSTON, C. H. MANN, H. P. ROPER, K. D. TIPTON, and A. E. JEUKENDRUP. Postexercise Muscle Glycogen Synthesis with Combined Glucose and Fructose Ingestion. Med. Sci. Sports Exerc., Vol. 40, No. 10, pp. 1789-1794, 2008. Purpose: To evaluate the efficacy Of using Combined glucose and fructose (GF) ingestion as a means to stimulate short-term (4 h) postexercise muscle glycogen synthesis compared to glucose only (G). Methods: On two separate occasions, six endurance-trained men performed an exhaustive glycogen-depleting exercise bout followed by a 4-h recovery period. Muscle biopsy samples were obtained from the vastus lateralis muscle at 0, 1, and 4 h after exercise. Subjects ingested carbohydrate Solutions containing G (90 g.h(-1)) or GF (G = 60 g.h(-1); F = 30 g.h(-1)) commencing immediately after exercise and every 30 min thereafter. Results: Immediate postexercise muscle glycogen concentrations were similar in both trials (G = 128 +/- 25 mmol.kg(-1) dry muscle (dm) vs GF = 112 +/- 16 mmol.kg(-1) dm; P > 0.05). Total glycogen storage during the 4-h recovery period was 176 +/- 33 and 155 +/- 31 mmol.kg(-1) din for G and GF. respectively (G vs GF, P > 0.05). Hence, mean muscle glycogen synthesis rates during the 4-h recovery period did not differ between the two conditions (G = 44 +/- 8 mmol.kg(-1) dm.h(-1) vs GF = 39 +/- 8 mmol.kg(-1) dm.h(-1), P > 0.05). Plasma glucose and serum insulin responses during the recovery period were similar in both conditions, although plasma lactate concentrations were significantly elevated during GF compared to G (by similar to 0.8 mmol.L-1, P < 0.05). Conclusions: Glucose and glucose/fructose (2:1 ratio) solutions, ingested at a rate of 90 g.h(-1), are equally effective at restoring muscle glycogen in exercised muscles, during the recovery from exhaustive exercise.
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