Study note • PMID 11508705
Caffeine as a lipolytic food component increases endurance performance in rats and athletes.
Worth trying if it fits your goal and context.
ELI5
In plain language
Caffeine is one of the famous ergogenic aids in the athletic field. (randomized trial; athletes).
Effects on Time-trial performance, Time to exhaustion are mixed or unclear from the abstract alone. Treat this as a signal, not a guarantee; confirm methods and context in the full paper.
Takeaways
What the abstract suggests
- • Study question: Caffeine is one of the famous ergogenic aids in the athletic field.
- • Effects on Time-trial performance, Time to exhaustion are mixed or unclear from the abstract alone.
- • Population: athletes.
- • Protocol cues (title/abstract): 6 mg/kg • 5 mg/kg • 1 h • 0 min • 30 min • 60 min.
Protocol
Protocol (as reported)
- • Intervention/exposure: caffeine (vs placebo).
- • Dose/time/duration cues in abstract/title: 6 mg/kg • 5 mg/kg • 1 h • 0 min • 30 min • 60 min • 45 min • 10 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 (athletes) 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: athletes.
- • Comparator: placebo.
- • Outcomes measured: Time-trial performance, Time to exhaustion.
- • Protocol cues mentioned: 6 mg/kg • 5 mg/kg • 1 h • 0 min • 30 min • 60 min • 45 min • 10 min.
- • Source: PubMed PMID 11508705 (2001) — Journal of nutritional science and vitaminology.
Results excerpt
What the abstract reports
“Increased FFA and glycerol concentrations reduced glycogen utilization during exercise compared with placebo group in rats.”
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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Performance Science Lab
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Caffeine for endurance performance: a practical protocol
Evidence-informed protocol: Caffeine for endurance performance: a practical protocol. Practical steps, who it helps, and what to watch out for.
Time-trial performance research for endurance athletes
Practical performance outcome used in many studies: closer to racing than lab-only metrics.
Time to exhaustion research for endurance athletes
A lab outcome that can still guide training: it often tracks fatigue resistance.