Caffeine Ingestion Prior to Incremental Cycling to Exhaustion in Recreational Cyclists
Abstract
Nine male recreational cyclist served as subjects in this experiment which included a control, placebo and caffeine trial. The aim of the experiment was to determine whether a 10 mg.kg-1 dose of caffeine given three hours prior to an incremental cycle ergometer exercise test, for caffeine naive subjects, would increase the time to exhaustion and therefore increase the amount of work undertaken by the cyclists. The cyclists initially worked at 100 watts for three minutes and then increased the workload by 50 watts every three minutes until exhaustion. Blood was drawn at the beginning of the test and every three minutes from an ante-cubital vein and was analysed for blood lactate, glucose and free fatty acids (FFA). Respiratory analysis was also undertaken and heart rate was monitored throughout the test. Subjects in the caffeine trial worked significantly longer and performed more work (p less than 0.05) than they did in either the control or placebo trials. FFA's were also significantly higher in this trial (p less than 0.05) and the lactate threshold was moved to the right as a percentage of the VO2max, which suggests less acidity and a decreased bicarbonate flushing. The respiratory exchange ratio data was significantly lowered (p less than 0.05) during workloads between 250 and 450 watts. No changes were seen in blood glucose or heart rates during the experiment. In conclusion, we feel that a 10 mg.kg-1 dose of caffeine is an ergogenic aid during incremental exercise when…
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The study's results are in contrast to a number of studies that have reported no effect of caffeine administration on exercise heart rate.
“Our results are in contrast to a number of studies that have reported no effect of caffeine administration on exercise heart rate [ 13 - 28 ].”
From Low doses of caffeine reduce heart rate during submaximal cycle ergometry (2007) · cites this paper as [18]
The similar heart rate response at high levels of exercise is consistent with other studies using either habituated or non-habituated subjects.
“This similar heart rate response at high levels of exercise is consistent with other studies using either habituated or non-habituated subjects [ 10 , 13 , 14 , 18 , 23 , 24 , 27 ].”
From Low doses of caffeine reduce heart rate during submaximal cycle ergometry (2007) · cites this paper as [18]
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BackgroundCaffeine Gum and Cycling Performance: A Timing Study
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“Caffeine may enhance performance during endurance exercise, particularly prolonged and exhaustive exercises (1,5,7,10,18,20,22).”
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“In previous research, caffeine has been shown to improve performance (8,10,15,21,22,25,34).”
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“1 software for sample size estimation based on a previous study, for paired Student t tests [26].”
MethodThe effect of caffeine on high-intensity, intermittent exercise to exhaustion
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Improving Effects of Multigrain Feed on Endurance
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“특히, 운동 중에 혈중 유리지방산의 농 도를 증가시키는 heparin(9)이나 caffeine(10)을 투여하거나 혈중 유리지방산 이용을 증가시키는 carnitine을 투여하여 glycogen 고갈을 지연시키게 된다(11).”
Bento, J. (2005) · Revista Portuguesa de Ciências do Desporto · doi:10.5628/rpcd.05.01.03
- Authors
- Flinn, S., Gregory, J., Mc Naughton, L., Tristram, S., & Davies, P.
- Venue
- International Journal of Sports Medicine
- Publisher
- Georg Thieme Verlag KG
- Published
- 1990-06
- Volume
- 11
- Issue
- 03
- Pages
- 188-193
- ISSN
- 0172-4622 (ISSN-L)
- 1439-3964
- OpenAlex
- W2045106705
- Cited by
- 69
- References
- 0
- Citations by year
- 2026: 2 · 2025: 1 · 2023: 1 · 2022: 3 · 2021: 3 · 2020: 1 · 2019: 1 · 2017: 2 · 2016: 1 · 2015: 3 · 2012: 3
- FWCI
- 2.85
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Sports Medicine (publishedVersion)
- PubMed (publishedVersion)
- Edge Hill University Research Information Repository (Edge Hill University) (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, time to exhaustion, incremental exercise, recreational cyclists, ergogenic aids, blood lactate, free fatty acids, respiratory exchange ratio, lactate threshold, blood glucose, heart rate
- MeSH terms
- Adult, Bicycling, Caffeine, Exercise Test, Physical Exertion, Fatty Acids, Nonesterified, Humans, Lactates, Male, Physical Endurance, Time Factors
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