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Postexercise Fructose-Maltodextrin Ingestion Enhances Subsequent Endurance Capacity
Ed Maunder1,1, Tim Podlogar1, Gareth A Wallis1
1School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, UNITED KINGDOM.
Medicine and Science in Sports and Exercise
|December 13, 2017
Summary
Athletes experienced enhanced endurance capacity after ingesting fructose-maltodextrin (FRU + MAL) during short-term recovery. This carbohydrate mix improved subsequent exercise performance compared to glucose-maltodextrin (GLU + MAL).
Area of Science:
- Sports Science
- Exercise Physiology
- Nutritional Biochemistry
Background:
- Optimizing glycogen replenishment is crucial for athletes performing repeated exercise bouts within a short timeframe.
- Previous studies suggest fructose-glucose mixtures enhance hepatic glycogen storage more effectively than glucose alone during recovery.
- Understanding the impact on subsequent exercise capacity is vital for performance optimization.
Purpose of the Study:
- To investigate whether coingestion of fructose-maltodextrin (FRU + MAL) enhances subsequent exercise capacity compared to glucose-maltodextrin (GLU + MAL) during short-term recovery.
- To determine the effects of different carbohydrate sources on exercise performance following prolonged exertion.
- To assess the impact of carbohydrate ingestion strategies on glycogen restoration and exercise capacity.
Main Methods:
- Eight trained endurance athletes participated in a single-blind, randomized, crossover trial.
- Participants completed two experimental trials involving a treadmill run to exhaustion, a 4-hour recovery period with either FRU + MAL or GLU + MAL ingestion, followed by a second run to exhaustion.
- Carbohydrate oxidation rates, plasma metabolite concentrations, and exercise capacity were measured.
Main Results:
- Exercise capacity in the second bout was significantly greater with FRU + MAL compared to GLU + MAL (32.4% increase).
- Total ingested carbohydrate oxidation rates were higher during the second exercise bout with FRU + MAL.
- While plasma glucose and fatty acid levels were similar, plasma lactate was higher during recovery with FRU + MAL.
Conclusions:
- Short-term recovery of endurance capacity is significantly enhanced by ingesting fructose-maltodextrin (FRU + MAL) compared to glucose-maltodextrin (GLU + MAL).
- Fructose-maltodextrin ingestion appears to be a superior strategy for improving exercise performance in repeated bouts within a 6-hour recovery period.
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