The effects of caffeine ingestion on time trial cycling performance
Date
2008
Authors
McNaughton, L.
Lovell, R.
Siegler, J.
Midgley, A.
Moore, L.
Bentley, D.
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Journal article
Citation
International Journal of Sports Physiology and Performance, 2008; 3(2):157-163
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Lars R. McNaughton, Ric J. Lovell, Jason Siegler, Adrian W. Midgley, Laura J.S. Moore and David J. Bentley
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Abstract
<jats:sec sec-type="purpose"><jats:title>Purpose:</jats:title><jats:p>The purpose of this work was to determine the effects of caffeine on high intensity time trial (TT) cycling performance in well-trained subjects.</jats:p></jats:sec><jats:sec sec-type="subjects"><jats:title>Subjects:</jats:title><jats:p>Six male cyclists with the following physical characteristics (mean ± SD) age 30.7 ± 12, height 179.3 ± 7.5 cm, mass 70.0 ± 7.5 kg, VO<jats:sub>2max</jats:sub> 65.0 ± 6.3 mL·kg<jats:sup>−1</jats:sup>·min<jats:sup>−1</jats:sup> undertook three 1-h TT performances, control (C), placebo (P) and caffeine (CAF), on a Velotron cycle ergometer conducted in a double-blind, random fashion. Subjects rested for 60 min and were then given CAF or P in a dose of 6 mg·kg<jats:sup>−1</jats:sup> body mass and then commenced exercise after another 60 min of rest. Before ingestion, 60 min postingestion, and at the end of the TT, finger-prick blood samples were analyzed for lactate.</jats:p></jats:sec><jats:sec sec-type="results"><jats:title>Results:</jats:title><jats:p>The cyclists rode significantly further in the CAF trial (28.0 ± 1.3 km) than they did in the C (26.3 ± 1.5 km, <jats:italic>P</jats:italic> < .01) or P (26.4 ± 1.5 km, <jats:italic>P</jats:italic> < .02) trials. No differences were seen in heart rate data throughout the TT (<jats:italic>P</jats:italic> > .05). Blood lactate levels were significantly higher at the end of the trials than either at rest or postingestion (<jats:italic>P</jats:italic> < .0001), but there were no differences between the three trial groups.</jats:p></jats:sec><jats:sec sec-type="conclusion"><jats:title>Conclusion:</jats:title><jats:p>On the basis of the data, we concluded that performance was improved with the use of a caffeine supplement.</jats:p></jats:sec>
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