Caffeine ingestion and cycling power output in a low or normal muscle glycogen state
Abstract
PURPOSE: Commencing selected workouts with low muscle glycogen availability augments several markers of training adaptation compared with undertaking the same sessions with normal glycogen content. However, low glycogen availability reduces the capacity to perform high-intensity (>85% of peak aerobic power (VO2 peak)) endurance exercise. We determined whether a low dose of caffeine could partially rescue the reduction in maximal self-selected power output observed when individuals commenced high-intensity interval training with low (LOW) compared with normal (NORM) glycogen availability. METHODS: Twelve endurance-trained cyclists/triathletes performed four experimental trials using a double-blind Latin square design. Muscle glycogen content was manipulated via exercise-diet interventions so that two experimental trials were commenced with LOW and two with NORM muscle glycogen availability. Sixty minutes before an experimental trial, subjects ingested a capsule containing anhydrous caffeine (CAFF, 3 mg · kg(-1) body mass) or placebo (PLBO). Instantaneous power output was measured throughout high-intensity interval training (8 × 5-min bouts at maximum self-selected intensity with 1-min recovery). RESULTS: There were significant main effects for both preexercise glycogen content and caffeine ingestion on power output. LOW reduced power output by approximately 8% compared with NORM (P < 0.01), whereas caffeine increased power output by 2.8% and 3.5% for NORM and LOW, respectively, (P < 0.01). CONCLUSION: We conclude that caffeine enhanced power output independently of muscle glycogen concentration but could not fully restore power output to levels commensurate with that when subjects commenced exercise with normal glycogen availability. However, the reported increase in power output does provide a likely performance benefit and may provide a means to further enhance the already augmented training response observed when selected sessions are commenced with reduced muscle glycogen availability.
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Caffeine may enhance training outcomes, especially when used to allow the athlete to train harder during key sessions that are deliberately fatiguing.
“Caffeine may also enhance training outcomes, especially when used to allow the athlete to train harder during key sessions that are deliberately fatiguing [122]”
From New strategies in sport nutrition to increase exercise performance (2016) · cites this paper as [122]
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- Authors
- LANE, S. C., ARETA, J. L., BIRD, S. R., COFFEY, V. G., BURKE, L. M., DESBROW, B., KARAGOUNIS, L. G., & HAWLEY, J. A.
- Affiliations
- RMIT University (AU)
- Griffith University (AU)
- ORCID
- Venue
- Medicine & Science in Sports & Exercise
- Published
- 2013-08
- Volume
- 45
- Issue
- 8
- Pages
- 1577-1584
- ISSN
- 0195-9131 (ISSN-L)
- OpenAlex
- W2047254168
- Cited by
- 54
- References
- 30
- Citations by year
- 2026: 3 · 2025: 5 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 5 · 2020: 6 · 2019: 4 · 2018: 3 · 2017: 4 · 2016: 5 · 2015: 4 · 2014: 6 · 2013: 3
- FWCI
- 4.41
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Medicine & Science in Sports & Exercise (publishedVersion)
- PubMed (publishedVersion)
- Research Bank (Australian Catholic University) (submittedVersion)
- RMIT Research Repository (RMIT University Library) (submittedVersion)
- Figshare (submittedVersion)
- Griffith Research Online (submittedVersion)
- Topics
- Health Sciences › Medicine › Pharmacology › Coffee research and impacts
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
- Keywords
- caffeine ingestion, cycling power output, high-intensity interval training, endurance cyclists, triathletes, exercise performance, training effects
- MeSH terms
- Adult, Bicycling, Caffeine, Double-Blind Method, Exercise Test, Glycogen, Humans, Male, Exercise, Muscle, Skeletal, Young Adult, Athletes
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