Post-exercise ingestion of a unique, high molecular weight glucose polymer solution improves performance during a subsequent bout of cycling exercise
FRANCIS B. STEPHENS, MARC ROIG, GERALD ARMSTRONG, & PAUL L. GREENHAFF
Abstract
The aim of the present study was to determine the effect of post-exercise ingestion of a unique, high molecular weight glucose polymer solution, known to augment gastric emptying and post-exercise muscle glycogen re-synthesis, on performance during a subsequent bout of intense exercise. On three randomized visits, eight healthy men cycled to exhaustion at 73.0% (s¼1.3) maximal oxygen uptake (90 min, s¼15). Immediately after this, participants consumed a one litre solution containing sugar-free flavoured water (control), 100 g of a low molecular weight glucose polymer or 100 g of a very high molecular weight glucose polymer, and rested on a bed for 2 h. After recovery, a 15-min time-trial was performed on a cycle ergometer, during which work output was determined. Post-exercise ingestion of the very high molecular weight glucose polymer solution resulted in faster and greater increases in blood glucose (P50.001) and serum insulin (P50.01) concentrations than the low molecular weight glucose polymer solution, and greater work output during the 15-min timetrial (164.1 kJ, s¼21.1) than both the sugar-free flavoured water (137.5 kJ, s¼24.2; P50.05) and the low molecular weight glucose polymer (149.4 kJ, s¼21.8; P50.05) solutions. These findings could be of practical importance for athletes wishing to optimize performance by facilitating rapid re-synthesis of the muscle glycogen store during recovery following prolonged sub-maximal exercise.
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