metabolism and endurance performance
Gregory R. Cox, Ben Desbrow, Paul G. Montgomery, Megan E. Anderson, Clinton R. Bruce, Theodore A. Macrides, David T. Martin, Angela Moquin, Alan Roberts, John A. Hawley and Louise M. Burke
J Appl Physiol 93:990-999, 2002. First published 31 May 2002; doi: 10.1152/japplphysiol.00249.2002
You might find this additional info useful...
This article cites 29 articles, 13 of which you can access for free at: http://jap.physiology.org/content/93/3/990.full#ref-list-1
Updated information and services including high resolution figures, can be found at: http://jap.physiology.org/content/93/3/990.full
Additional material and information about Journal of Applied Physiology can be found at: http://www.the-aps.org/publications/jappl
This information is current as of February 12, 2013.
Journal of Applied Physiology publishes original papers that deal with diverse area of research in applied physiology, especially those papers emphasizing adaptive and integrative mechanisms. It is published 12 times a year (monthly) by the American Physiological Society, 9650 Rockville Pike, Bethesda MD 20814-3991. Copyright © 2002 the American Physiological Society. ISSN: 8750-7587, ESSN: 1522-1601. Visit our website at http://www.the-aps.org/.
Downloaded from http://jap.physiology.org/ at University of Ottawa on February 12, 2013
This article has been cited by 4 other HighWire-hosted articles: http://jap.physiology.org/content/93/3/990#cited-by
J Appl Physiol 93: 990–999, 2002.
First published May 31, 2002; 10.1152/japplphysiol.00249.2002.
Effect of different protocols of caffeine intake
on metabolism and endurance performance
Received 25 March 2002; accepted in ﬁnal form 24 May 2002
Cox, Gregory R., Ben Desbrow, Paul G. Montgomery,
Megan E. Anderson, Clinton R. Bruce, Theodore A.
Macrides, David T. Martin, Angela Moquin, Alan Roberts, John A. Hawley, and Louise M. Burke. Effect of different protocols of caffeine intake on metabolism and endurance performance. J Appl Physiol 93: 990–999, 2002. First published May 31, 2002; 10.1152/japplphysiol.00249.
2002.—Competitive athletes completed two studies of 2-h
steady-state (SS) cycling at 70% peak O2 uptake followed by
7 kJ/kg time trial (TT) with carbohydrate (CHO) intake
before (2 g/kg) and during (6% CHO drink) exercise. In Study A, 12 subjects received either 6 mg/kg caffeine 1 h preexercise (Precaf), 6
1 mg/kg caffeine every 20 min throughout SS
(Durcaf), 2 5 ml/kg Coca-Cola between 100 and 120 min SS
and during TT (Coke), or placebo. Improvements in TT were
as follows: Precaf, 3.4% (0.2–6.5%, 95% conﬁdence interval); Durcaf, 3.1% ( 0.1–6.5%); and Coke, 3.1% ( 0.2–6.2%). In Study B, eight subjects received 3 5 ml/kg of different cola drinks during the last 40 min of SS and TT: decaffeinated, 6% CHO (control); caffeinated, 6% CHO; decaffeinated, 11%
CHO; and caffeinated, 11% CHO (Coke). Coke enhanced TT
by 3.3% (0.8–5.9%), with all trials showing 2.2% TT enhancement (0.5–3.8%; P 0.05) due to caffeine. Overall, 1) 6 mg/kg caffeine enhanced TT performance independent of timing of
intake and 2) replacing sports drink with Coca-Cola during
the latter stages of exercise was equally effective in enhancing endurance performance, primarily due to low intake of caffeine ( 1.5 mg/kg).
carbohydrate; ergogenic aids; cola drink
an enhancement of prolonged, submaximal exercise after caffeine ingestion (2, 7, 9, 10, 14–16, 19, 22, 23, 27, 29). The mechanism(s) proposed to explain these beneﬁts includes an increased utilization of plasma free fatty acids (FFA)
(27) and/or intramuscular triacylglycerol (10), which
acts to reduce the rate of muscle glycogenolysis (10,
27), as well as favorable changes in central nervous
MANY STUDIES HAVE REPORTED
Address for reprint requests and other correspondence: L. M. Burke, Dept. of Sports Nutrition, P. O. Box 176, Belconnen ACT 2616,...