Effect of Carbohydrate Feeding During Recovery from Prolonged Running on Muscle Glycogen Metabolism During Subsequent Exercise

• Published in: International journal of sports medicine 2003-08, Vol.24 (6), p.452-458
• Main Authors: Tsintzas, K., Williams, C., Boobis, L., Symington, S., Moorehouse, J., Garcia-Roves, P., Nicholas, C.
• Format: Article
• Language: English
• Subjects: Adult; Biological and medical sciences; Blood Glucose - metabolism; Carbohydrates; Cross-Over Studies; Dietary Carbohydrates - pharmacology; Double-Blind Method; Fatty Acids, Nonesterified - blood; Fundamental and applied biological sciences. Psychology; Glycogen - metabolism; Heart Rate; Humans; Insulin - blood; Lactic Acid - metabolism; Male; Metabolisms and neurohumoral controls; Muscle, Skeletal - blood supply; Muscle, Skeletal - metabolism; Nutrition; Oxygen - metabolism; Plasma Volume; Running; Vertebrates: anatomy and physiology, studies on body, several organs or systems
• ISSN: 0172-4622; 1439-3964
• DOI: 10.1055/s-2003-41181

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˙O 2 max) 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˙O 2 max. 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.