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Cited by 23Muscle metabolism and nutritionSports Performance and TrainingCardiovascular and exercise physiology

Effects of Preexercise Carbohydrate Ingestion on Mountain Bike Performance

CRAMP, TANYA, BROAD, ELIZABETH, MARTIN, DAVID, MEYER, BARBARA J.·2004·Medicine & Science in Sports & Exercise
DOI 10.1249/01.mss.0000139805.91675.5b
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Abstract

PURPOSE: This study examined the performance and metabolic effects of consuming 1.0 (LC) and 3.0 (HC) grams of carbohydrate (CHO) per kilogram body mass (BM), 3 h before a 93-min simulated mountain bike race. METHODS: After two familiarization trials, eight male subjects undertook two CHO trials in a double-blind counterbalanced fashion on a cycle ergometer. The HC meal was supplemented with maltodextrin while maintaining the same glycemic index and apparent volume of food as the LC meal. Stochastic cycling was undertaken for 93 min (4 x 22.50-min laps) with performance measured as the total work performed in 6 x 30-s periods each lap during the test. RESULTS: Performance in lap 1 was better with LC (P < 0.03) whereas performance in lap 4 was better with HC (P < 0.02). Overall performance was 3% greater in HC compared with LC (NS, P = 0.13). Serum glucose was significantly lower (P < 0.04) in HC immediately before the mountain bike test (180 min postprandial) and at 10 min into the test (P < 0.01). Gastrointestinal comfort decreased similarly for both trials over time (P < 0.05). CONCLUSION: These data suggest that ingestion of 3.0 g x kg(-1) BM of CHO 3 h before a 93-min mountain bike simulated race does not produce a statistically significant improvement in overall performance compared with 1.0 g x kg(-1) BM. However, in real terms, a 3% performance improvement may benefit athletes in a race situation. Differences in performance during the first and last laps indicate a variation in pacing strategies that may have resulted from differing blood glucose levels between trials.

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Crossref · 10.1249/01.mss.0000139805.91675.5b

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  • Endurance athletes are well known to follow diets that result in the consumption of high amounts of both simple and complex carbohydrates.

    “Endurance athletes are well known to follow diets that result in the consumption of high amounts of both simple and complex carbohydrates [208, 209].”

    From The athletic gut microbiota (2020) · cites this paper as [208]

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Authors
CRAMP, T., BROAD, E., MARTIN, D., & MEYER, B. J.
Affiliations
  • University of Wollongong (AU)
  • ACT Government (AU)
ORCID
Venue
Medicine & Science in Sports & Exercise
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2004-09
Volume
36
Issue
9
Pages
1602-1609
ISSN
0195-9131 (ISSN-L)
DOI
10.1249/01.mss.0000139805.91675.5b
OpenAlex
W2077726420
Cited by
23
References
26
Citations by year
2026: 1 · 2025: 2 · 2022: 2 · 2021: 1 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 3 · 2014: 2
FWCI
0.25
Type
journal article
Language
en
Open access
closed
Locations
  • Medicine & Science in Sports & Exercise (publishedVersion)
  • PubMed (publishedVersion)
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
carbohydrate loading, maltodextrin, serum glucose, pacing strategy, endurance cycling
MeSH terms
Adult, Australia, Bicycling, Blood Glucose, Dietary Carbohydrates, Drinking Behavior, Physical Exertion, Fatty Acids, Nonesterified, Humans, Male, Oxygen Consumption, Respiration, Task Performance and Analysis, Gastrointestinal Tract

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