Caffeine, cycling performance and exogenous CHO oxidation: a dose response study

Desbrow, Ben, Barrett, Clare M., Minahan, Clare L., Grant, Gary D. and Leveritt, Michael D. (2009) Caffeine, cycling performance and exogenous CHO oxidation: a dose response study. Medicine and Science in Sports and Exercise, 41 9: 1744-1751. doi:10.1249/MSS.0b013e3181a16cf7


Author Desbrow, Ben
Barrett, Clare M.
Minahan, Clare L.
Grant, Gary D.
Leveritt, Michael D.
Title Caffeine, cycling performance and exogenous CHO oxidation: a dose response study
Journal name Medicine and Science in Sports and Exercise   Check publisher's open access policy
ISSN 0195-9131
1530-0315
Publication date 2009-09
Sub-type Article (original research)
DOI 10.1249/MSS.0b013e3181a16cf7
Volume 41
Issue 9
Start page 1744
End page 1751
Total pages 8
Place of publication Philadelphia, PA, United States
Publisher Lippincott Williams & Wilkins
Language eng
Formatted abstract
Purpose: This study investigated the effects of a low and moderate caffeine dose on exogenous CHO oxidation and endurance-exercise performance.
Methods: Nine trained and familiarized male cyclists (mean ± SD: 29.4 ± 4.5 yr, 81.3 ± 10.8 kg body weight [BW], 183.8 ± 8.2 cm, V·O2peak = 61.7 ± 4.8 mL·kg-1·min-1) undertook three trials, with training and high CHO diet being controlled. One hour before exercise, subjects ingested capsules containing placebo and 1.5 or 3 mg·kg-1 BW of caffeine using a double-blind administration protocol. Trials consisted of 120 min steady-state cycling at approximately 70% V·O2peak, immediately followed by a 7-kJ·kg-1 BW time trial (TT). During exercise, subjects were provided with fluids containing 14C-glucose every 20 min to determine exogenous CHO oxidation.
Results: No significant TT performance improvements were observed during caffeine-containing trials (mean ± SD: placebo = 30 min 25 s ± 3 min 10 s; 1.5 mg·kg-1 BW = 30 min 42 s ± 3 min 41 s; and 3 mg·kg-1 BW = 29 min 51 s ± 3 min 38 s). Furthermore, caffeine failed to significantly alter maximal exogenous CHO oxidation (maximal oxidation rates: placebo = 0.95 ± 0.2 g·min-1; 1.5 mg·kg-1 BW = 0.92 ± 0.2 g·min-1; and 3 mg·kg-1 BW = 0.96 ± 0.2 g·min-1).
Conclusion: Low and moderate doses of caffeine have failed to improve endurance performance in fed, trained subjects.
Keyword Endurance
Glucose
Metabolism
Substrate
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Human Movement and Nutrition Sciences Publications
 
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Created: Wed, 03 Apr 2013, 08:28:34 EST by Michael Leveritt on behalf of School of Human Movement and Nutrition Sciences