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DOI: 10.1055/s-2003-41181
Effect of Carbohydrate Feeding During Recovery from Prolonged Running on Muscle Glycogen Metabolism During Subsequent Exercise
Publication History
Accepted after revision: October 25, 2002
Publication Date:
07 August 2003 (online)
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Abstract
This study examined the effect of carbohydrate (CHO) intake during a 4 h recovery from prolonged running on muscle glycogen metabolism during subsequent exercise. On 2 occasions, 7 male subjects ran for 90 min at 70 % maximum oxygen uptake (V˙O2max) on a motorized treadmill (R1) followed by a 4 h rest period (REC) and a 15 min run (R2) consisting of 5 min at 60 % and 10 min at 70 % V˙O2max. During REC, each subject ingested a total of 2.7 l of an isotonic solution containing either 50 g of CHO (LOW) or 175 g of CHO (HIGH). Biopsy samples were obtained from the vastus lateralis immediately after R1, REC and R2. During REC, a higher muscle glycogen resynthesis was observed in HIGH when compared with LOW trial (75 ± 20 vs. 31 ± 11 mmol × kg dry matter (dm)-1, respectively; p < 0.01). Muscle glycogen utilization during R2 was similar between the HIGH and LOW trials (39 ± 10 vs. 46 ± 11 mmol × kg dm-1, respectively). These results suggest that ingestion of a large amount of CHO at frequent intervals during recovery from exercise does not affect the rate of muscle glycogen utilization during subsequent exercise.
Key words
Carbohydrate feeding · exercise · muscle glycogen · recovery
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Prof. C. Williams
School of Sport & Exercise Sciences · Loughborough
University
Loughborough, Leics · LE11 3TU · UK ·
Phone: 01509-226309
Fax: 01509-226300
Email: C.Williams@lboro.ac.uk