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Caffeine ingestion does not alter performance during a 100-km cycling time-trial performance
Angus M Hunter1, Allan St Clair Gibson, Malcolm Collins
1Department of Sports Studies, University of Stirling, Stirling, FK9 4LA Scotland, UK.
International Journal of Sport Nutrition and Exercise Metabolism
|December 26, 2002
Summary
Caffeine ingestion did not improve performance in a 100-km cycling time trial with high-intensity epochs. Heart rate increased with caffeine, but power output and completion times remained unchanged, suggesting no ergogenic benefit for predetermined endurance goals.
Area of Science:
- Exercise Physiology
- Sports Nutrition
Background:
- Caffeine is a widely used ergogenic aid in endurance sports.
- Its effectiveness may depend on exercise intensity, duration, and performance goals.
Purpose of the Study:
- To investigate the ergogenic effects of caffeine during a prolonged laboratory cycling time trial with interspersed high-intensity epochs (HIE).
- To determine if caffeine alters pacing strategies or muscle fatigue during such an event.
Main Methods:
- Eight highly trained cyclists completed three 100-km time trials under placebo (Pl), carbohydrate (Cho), and caffeine (Caf) conditions.
- Caffeine was administered pre-exercise and during exercise, alongside a 7% carbohydrate solution.
- Performance was assessed by time to completion, average power, and time to complete 1-km and 4-km HIE.
Main Results:
- No significant differences were observed in average power, 100-km time to completion, or HIE completion times between Pl, Cho, and Caf trials.
- Mean heart rate was significantly higher during HIE in the Caf trial compared to Pl and Cho.
- Electromyography (EMG) amplitude and mean power frequency spectrum showed no differences, indicating no altered peripheral or central fatigue.
Conclusions:
- Caffeine ingestion does not appear to provide ergogenic benefits for performance in a 100-km cycling time trial with a predetermined speed or distance goal.
- The observed increase in heart rate with caffeine did not translate to improved performance, suggesting a centrally regulated pacing strategy unaffected by caffeine.