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Cited by 15Muscle metabolism and nutritionSports Performance and TrainingCardiovascular and exercise physiology

Postexercise Glucose–Fructose Coingestion Augments Cycling Capacity During Short-Term and Overnight Recovery From Exhaustive Exercise, Compared With Isocaloric Glucose

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Gray, Edward A., Green, Thomas A., Betts, James A., Gonzalez, Javier T.·2020·International Journal of Sport Nutrition and Exercise Metabolism
DOI 10.1123/ijsnem.2019-0211
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Abstract

During short-term recovery, postexercise glucose–fructose coingestion can accelerate total glycogen repletion and augment recovery of running capacity. It is unknown if this advantage translates to cycling, or to a longer (e.g., overnight) recovery. Using two experiments, the present research investigated if postexercise glucose–fructose coingestion augments exercise capacity following 4-hr (short experiment; n = 8) and 15-hr (overnight experiment; n = 8) recoveries from exhaustive exercise in trained cyclists, compared with isocaloric glucose alone. In each experiment, a glycogen depleting exercise protocol was followed by a 4-hr recovery, with ingestion of 1.5 or 1.2 g·kg−1·hr−1 carbohydrate in the short experiment (double blind) and the overnight experiment (single blind), respectively. Treatments were provided in a randomized order using a crossover design. Four or fifteen hours after the glycogen depletion protocol, participants cycled to exhaustion at 70% Wmax or 65% Wmax in the short experiment and the overnight experiment, respectively. In both experiments there was no difference in substrate oxidation or blood glucose and lactate concentrations between treatments during the exercise capacity test (trial effect, p > .05). Nevertheless, cycling capacity was greater in glucose + fructose versus glucose only in the short experiment (28.0 ± 8.4 vs. 22.8 ± 7.3 min, d = 0.65, p = .039) and the overnight experiment (35.9 ± 10.7 vs. 30.6 ± 9.2 min, d = 0.53, p = .026). This is the first study to demonstrate that postexercise glucose–fructose coingestion enhances cycling capacity following short-term (4 hr) and overnight (15 hr) recovery durations. Therefore, if multistage endurance athletes are ingesting glucose for rapid postexercise recovery then fructose containing carbohydrates may be advisable.

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  • Consuming glucose and fructose during the initial 4 h and again at 15 h of recovery from exhaustive exercise resulted in a notable increase in cycling performance capacity, ~27% longer compared with glucose alone.

    “Gray et al. [34] reported that consuming glucose and fructose during the initial 4 h and again at 15 h of recovery from exhaustive exercise resulted in a notable increase in cycling performance capacity, ~ 27% longer compared with glucose alone.”

    From Nutritional Strategies to Improve Post-exercise Recovery and Subsequent Exercise Performance: A Narrative Review (2025) · cites this paper as [34]

    The Discussion (page unavailable) reports greater cycling capacity with glucose–fructose than with glucose alone after both 4-hour and 15-hour recoveries. It gives a 27.2% improvement for the 4-hour experiment, but 18.0% for the overnight experiment. The Experimental Trials section says carbohydrate was ingested during the first four hours and cycling capacity was tested at 15 hours; it does not say participants consumed it again at 15 hours. (LLM, conf=0.90)

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Authors
Gray, E. A., Green, T. A., Betts, J. A., & Gonzalez, J. T.
Affiliations
University of Bath (GB)
Corresponding author
Gonzalez, Javier T.
ORCID
Venue
International Journal of Sport Nutrition and Exercise Metabolism
Publisher
Human Kinetics
Published
2020-01-01
Volume
30
Issue
1
Pages
54-61
ISSN
  • 1526-484X (ISSN-L)
  • 1543-2742
DOI
10.1123/ijsnem.2019-0211
OpenAlex
W2987119663
Cited by
15
References
42
Citations by year
2026: 2 · 2025: 5 · 2024: 1 · 2022: 3 · 2021: 1 · 2020: 3
FWCI
0.93
Type
journal article
Language
en
Open access
Locations
  • International Journal of Sport Nutrition and Exercise Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Pure (University of Bath) (publishedVersion, other-oa)
Funders
  • GlaxoSmithKline
  • PepsiCo
  • Kellogg's
  • University of Bath
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
post-exercise recovery, cycling capacity, glycogen repletion, exhaustive exercise, carbohydrate intake, endurance athletes, substrate oxidation, lactate, blood glucose
MeSH terms
Adult, Beverages, Bicycling, Blood Glucose, Double-Blind Method, Female, Fructose, Glucose, Glycogen, Humans, Liver, Male, Oxidation-Reduction, Physical Endurance, Time Factors, Single-Blind Method, Cross-Over Studies, Lactic Acid, Young Adult

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