Caffeine: The Cyclist’s Golden Supplement

Caffeine is the most widely used psychoactive substance in the world, and it is also one of the best-supported legal sports supplements in current scientific research. For cyclists, appropriate caffeine use can deliver significant performance gains, and it is legal in most sports organizations globally (although it was once restricted at the Olympics).

The Scientific Basis for Caffeine’s Performance Enhancement

Key Research Findings

Across more than 300 studies, the benefits of caffeine for endurance exercise:

For an amateur rider with an FTP of 250W, a 7% improvement equates to roughly 17.5W—an effect close to moving up a category.

Physiological Mechanisms

How caffeine works:

1. Adenosine Receptor Blockade

• Adenosine is a substance in the brain that produces feelings of fatigue
• Caffeine binds to adenosine receptors, preventing fatigue signals from being transmitted
• Effect: Delays fatigue, enhances alertness and focus

2. Promotes Catecholamine Secretion

• Increases neurotransmitters such as adrenaline and dopamine
• Effect: Raises heart rate, increases motivation

3. Enhances Fat Oxidation (More Controversial)

• Early research suggested caffeine could “spare glycogen”
• Modern research indicates the primary benefits remain at the neurological level

Proper Usage Strategies

Optimal Dosage

Effective dosage recommended by research:

• 3-6 mg/kg body weight
• For a 70 kg rider: 210-420mg of caffeine
• Start with 3 mg/kg and observe individual response

Timing of Intake

Most important takeaway: consume 60 minutes before an event or high-intensity training session

Caffeine Cycling

A method to reduce tolerance:

Suggested strategy:

• Daily caffeine intake: moderate (under 200mg per day)
• 5-7 days before a race: reduce or stop caffeine intake
• Race day: use caffeine for maximum benefit

Note: Withdrawal symptoms such as headaches and fatigue may appear in the first few days after stopping caffeine; it is recommended to try this during a non-important training period.

Individual Differences and Precautions

Genetic Influence

The CYP1A2 gene determines the rate of caffeine metabolism:

• Fast metabolizers: Caffeine benefits may be more pronounced, with a shorter duration of action
• Slow metabolizers: Caffeine benefits are smaller, but side effects (palpitations, anxiety) are more pronounced

Genetic testing (such as 23andMe) can confirm your metabolizer type, but it is not necessary—observing your own response is sufficient.

Possible Side Effects

The Dehydration Myth

Caffeine was previously thought to have a diuretic effect; modern research has found:

• The diuretic effect of moderate caffeine (< 500mg) is negligible
• No extra fluid intake is needed because of coffee consumption

Caffeine Strategies for Riders in Taiwan

Taiwan has a rich coffee culture, which is an advantage for cyclists:

Practical combination before an early morning departure:

• 60 minutes before departure: a cup of black coffee (150-200mg caffeine)
• Pair with carbohydrate-rich breakfast (to reduce gastrointestinal discomfort)
• During long rides (after 2 hours): carry caffeinated energy gels for supplementation

Note: Hand-shaken drinks and sweet coffees (with large amounts of syrup) from coffee shops are not suitable for training—black coffee or Americano is the best choice.

Conclusion

Caffeine is the most effective, legal, and cost-efficient supplement in a cyclist’s toolkit. But like any tool, understanding the proper way to use it is essential to maximizing its benefits. Before your next important training session or race, treat yourself to a good cup of black coffee—science supports you in doing so.

Related Reading

• The Use of Caffeine in Cycling: Timing and Dosage
• Caffeine Supplementation Strategies for Cycling: Benefits, Timing, and Side Effect Management
• The Science of Caffeine’s Ergogenic Effects: Optimal Timing and Dosage Guide for Cyclists
• The Science of Caffeine: Optimal Dosage and Timing for Endurance Sports