Postexercise Fructose–Maltodextrin Ingestion Enhances Subsequent Endurance Capacity

Dec 13, 2017Medicine and science in sports and exercise

Taking a Fructose-Maltodextrin Drink After Exercise May Improve Later Endurance

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Abstract

Exercise capacity in the second bout was significantly greater with fructose-maltodextrin (FRU + MAL) ingestion at 81.4 ± 22.3 minutes compared to glucose-maltodextrin (GLU + MAL) at 61.4 ± 9.6 minutes.

The ingestion of FRU + MAL resulted in a large effect size of 1.84 ± 1.12 for exercise capacity improvement.
Total carbohydrate oxidized during the second exercise bout was significantly higher with FRU + MAL, at 223 ± 66 g compared to 157 ± 26 g with GLU + MAL.
Ingested carbohydrate oxidation rates were greater during the second bout with FRU + MAL ingestion.
Plasma lactate concentrations were significantly higher during recovery before the second bout with FRU + MAL.
Self-reported nausea and stomach fullness were slightly more favorable with FRU + MAL compared to GLU + MAL.

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PURPOSE: Restoring skeletal muscle and hepatic glycogen content during short-term (<6 h) recovery from prolonged exercise is pertinent for athletes seeking to maximize performance in repeated exercise bouts. Previous research suggests that coingestion of fructose-glucose carbohydrate sources augments hepatic and has equivalent effects on skeletal muscle glycogen storage during short-term recovery from prolonged exercise compared with isocaloric glucose ingestion. The aim of the present investigation was to determine whether this has a discernible effect on subsequent exercise capacity.

METHODS: Eight trained endurance runners and triathletes performed two experimental trials in a single-blind, randomized, and counterbalanced crossover design. Trials involved treadmill running to exhaustion at 70% V˙O2max, a 4-h recovery with 90 g·h of glucose-maltodextrin (GLU + MAL) or fructose-maltodextrin (FRU + MAL) ingestion (1:1.5 ratio), and a second bout of treadmill running to exhaustion at 70% V˙O2max.

RESULTS: Exercise capacity in bout 2 was significantly greater with FRU + MAL (81.4 ± 22.3 vs 61.4 ± 9.6 min, P = 0.02), a large magnitude effect (effect size = 1.84 ± 1.12, 32.4% ± 19.9%). Total carbohydrate oxidation rates were not significantly different during bout 1 or 2 between trials, although total carbohydrate oxidized in bout 2 was significantly greater with FRU + MAL (223 ± 66 vs 157 ± 26 g, P = 0.02). Ingested carbohydrate oxidation rates were greater during bout 2 with FRU + MAL (P = 0.001). Plasma glucose and nonesterified fatty acid concentrations were not significantly different between trials. Plasma lactate concentrations were significantly greater during recovery before bout 2 with FRU + MAL (P = 0.001). Self-reported nausea and stomach fullness during bout 2 were marginally in favor of FRU + MAL.

CONCLUSION: Short-term recovery of endurance capacity was significantly enhanced with FRU + MAL versus GLU + MAL ingestion during recovery.

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Postexercise Fructose–Maltodextrin Ingestion Enhances Subsequent Endurance Capacity

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