King Grub
2017-12-13, 10:11
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 co-ingestion of fructose-glucose carbohydrate sources augments hepatic and has equivalent effects on skeletal muscle glycogen storage during short-term recovery from prolonged exercise compared to isocaloric glucose ingestion. The aim of the present investigation was to determine if this has a discernible effect on subsequent exercise capacity.
METHODS:
Eight trained endurance runners and triathletes performed two experimental trials in a single-blind, randomised, and counterbalanced cross-over design. Trials involved treadmill running to exhaustion at 70 %V[Combining Dot Above]O2max, a four-hour 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[Combining Dot Above]O2max.
RESULTS:
Exercise capacity in bout two was significantly greater with FRU+MAL (81.4 ± 22.3 vs. 61.4 ± 9.6 min, P = 0.02), a large magnitude effect (ES = 1.84 ± 1.12, 32.4 ± 19.9 %). Total carbohydrate oxidation rates were not significantly different during bout one or two between-trials, although total carbohydrate oxidized in bout two was significantly greater with FRU+MAL (223 ± 66 vs. 157 ± 26 g, P = 0.02). Ingested carbohydrate oxidation rates were greater during bout two with FRU+MAL (P = 0.001). Plasma glucose and non-esterified fatty acid concentrations were not significantly different between-trials. Plasma lactate concentrations were significantly greater during recovery prior to bout two with FRU+MAL (P = 0.001). Self-reported nausea and stomach fullness during bout two were marginally in favour of FRU+MAL.
CONCLUSION:
Short-term recovery of endurance capacity was significantly enhanced with FRU+MAL vs. GLU+MAL ingestion during recovery.
Med Sci Sports Exerc. 2017 Dec 11. Postexercise Fructose-Maltodextrin Ingestion Enhances Subsequent Endurance Capacity.
METHODS:
Eight trained endurance runners and triathletes performed two experimental trials in a single-blind, randomised, and counterbalanced cross-over design. Trials involved treadmill running to exhaustion at 70 %V[Combining Dot Above]O2max, a four-hour 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[Combining Dot Above]O2max.
RESULTS:
Exercise capacity in bout two was significantly greater with FRU+MAL (81.4 ± 22.3 vs. 61.4 ± 9.6 min, P = 0.02), a large magnitude effect (ES = 1.84 ± 1.12, 32.4 ± 19.9 %). Total carbohydrate oxidation rates were not significantly different during bout one or two between-trials, although total carbohydrate oxidized in bout two was significantly greater with FRU+MAL (223 ± 66 vs. 157 ± 26 g, P = 0.02). Ingested carbohydrate oxidation rates were greater during bout two with FRU+MAL (P = 0.001). Plasma glucose and non-esterified fatty acid concentrations were not significantly different between-trials. Plasma lactate concentrations were significantly greater during recovery prior to bout two with FRU+MAL (P = 0.001). Self-reported nausea and stomach fullness during bout two were marginally in favour of FRU+MAL.
CONCLUSION:
Short-term recovery of endurance capacity was significantly enhanced with FRU+MAL vs. GLU+MAL ingestion during recovery.
Med Sci Sports Exerc. 2017 Dec 11. Postexercise Fructose-Maltodextrin Ingestion Enhances Subsequent Endurance Capacity.