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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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EFFECTS OF CAFFEINE ON EXERCISE PERFORMANCE IN SEDENTARY FEMALES |
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Karen E. Wallman  ,
Jin W. Goh and Kym J. Guelfi |
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School of Sport Science, Exercise and Health, The University of Western Australia, Perth, Western Australia. |
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© Journal of Sports Science and Medicine (2010) 9, 183 - 189 |
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| ABSTRACT | |||
| The purpose of the study was to examine the effect of caffeine
ingestion on total work, average power, oxygen consumption (VO2),
respiratory exchange ratio (RER), ratings of perceived exertion (RPE), heart
rate (HR) and energy expenditure (kJ) during stationary cycling at a standardised
power output, as well as during a set time period where participants were
required to cycle as fast as they could. Ten healthy, sedentary, female,
non- regular caffeine users completed 15 min of stationary cycling at a
standardised power output equating to 65% HRmax (Phase A), followed by 10
min of stationary cycling where they were required to cycled as fast as
they could (Phase B) after ingesting 6.0 mg·kg-1 of caffeine or placebo
60 min prior to exercise. VO2 and energy expenditure were significantly
higher at the end of Phase A (p = 0.008 and p = 0.011, respectively). All
other variables examined in Phase A were similar between trials. In Phase
B, there were no significant differences found for any variable assessed.
While caffeine ingestion resulted in significant increases in VO2
and energy expenditure during steady-state exercise, it did not improve
cycling performance during a 10 min trial where participants were required
to cycle as fast as they could. Key words: Sub-maximal exercise, rating of perceived exertion, energy expenditure, weight maintenance. |
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