Study note • PMID 32232597
A Randomised, Placebo-Controlled, Crossover Study Investigating the Optimal Timing of a Caffeine-Containing Supplement for Exercise Performance.
Worth trying if it fits your goal and context.
ELI5
In plain language
BACKGROUND: Pre-exercise supplements containing low doses of caffeine improve endurance exercise performance, but the most efficacious time for consumption before intense endurance exercise remains unclear, as does the contribution… (randomized trial; cyclists).
The abstract doesn’t indicate a clear change in Time-trial performance under the tested conditions. Treat this as a signal, not a guarantee; confirm methods and context in the full paper.
Takeaways
What the abstract suggests
- • Study question: BACKGROUND: Pre-exercise supplements containing low doses of caffeine improve endurance exercise performance, but the most efficacious time for consumption before intense endurance exercise remains unclear, as does the contribution…
- • The abstract doesn’t indicate a clear change in Time-trial performance under the tested conditions.
- • Population: cyclists.
- • Protocol cues (title/abstract): 200 mg • 1600 mg • 1000 mg • 30 min • 35 min.
Protocol
Protocol (as reported)
- • Intervention/exposure: caffeine, beta-alanine (vs placebo).
- • Dose/time/duration cues in abstract/title: 200 mg • 1600 mg • 1000 mg • 30 min • 35 min.
- • Outcomes: Time-trial performance, Time to exhaustion.
- • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.
Fit
Who it helps, and who should skip it
Who it helps
- • Athletes similar to the study population (cyclists) working on supplements.
- • Athletes who can measure Time-trial performance, Time to exhaustion with a repeatable workout or time-trial effort.
Who should skip
- • If you have symptoms or conditions that make the intervention risky, get professional guidance.
- • If you’re near race day and can’t safely test, defer the experiment.
Methods
What the study actually did
- • Design: randomized trial (placebo-controlled).
- • Population: cyclists.
- • Comparator: placebo.
- • Outcomes measured: Time-trial performance, Time to exhaustion.
- • Protocol cues mentioned: 200 mg • 1600 mg • 1000 mg • 30 min • 35 min.
- • Source: PubMed PMID 32232597 (2020) — Sports medicine - open.
Results excerpt
What the abstract reports
“Total work performed during the time trial in PRE was 5% greater than PLA (3.53 +/- 0.14 vs.”
Note: excerpts are short; for full context, read the paper.
Limits
Limitations & bias
- • Abstract-only summaries can miss critical details (population, protocol, adherence, and context).
- • Single studies often don’t generalize to your event, history, and training load; treat results as a starting point.
- • If your context differs (elite vs recreational; cycling vs running), adjust expectations and be conservative.
- • This is performance information, not medical advice.
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