Caffeine for endurance performance: a practical protocol

Topic

Caffeine for endurance performance: a practical protocol

TL;DR

What this changes

• • Caffeine is one of the few supplements with consistent endurance performance evidence.
• • The practical constraint is dosing and timing without gut distress or sleep disruption.
• • Test it in training first; race day is not experiment day.

Protocol

A practical default

• • Pick a single race-intent workout to test (tempo/threshold or long-run finish).
• • Start low: try ~1–3 mg/kg caffeine 45–60 minutes pre-session; increase only if well tolerated.
• • Avoid stacking late-day caffeine that ruins sleep (sleep loss can erase the benefit).
• • For long events, consider a split dose: pre-start + mid-race, only if you’ve practiced it.
• • Track outcome: pace at fixed RPE, power, or time trial time vs a comparable baseline.

Fit

Who it helps, and who should skip it

Limits

Limitations and uncertainty

• • Responses vary a lot by person; a protocol that works for one athlete can backfire for another.
• • Many studies use controlled conditions that don’t match chaotic race day variables.
• • This is performance information, not medical advice; consult a clinician if you have conditions affected by stimulants.