Study note • PMID 40839339
Evaluating the Impact of Urolithin A Supplementation on Running Performance, Recovery, and Mitochondrial Biomarkers in Highly Trained Male Distance Runners.
How to use this page
This note summarizes one study record. Check the participants, methods, results, and limitations before applying it to training.
- • Design signal: randomized trial.
- • Population relevance: athlete/trained context.
- • Consistency: single-study evidence.
- • Practical recommendation depends on tolerance, context, and whether it protects training consistency.
ELI5
In plain language
BACKGROUND: Urolithin A (UA) is a metabolite produced by gut bacteria following the consumption of ellagitannin-rich foods. (randomized trial; n=42 trained runners).
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: Urolithin A (UA) is a metabolite produced by gut bacteria following the consumption of ellagitannin-rich foods.
- • The abstract doesn’t indicate a clear change in Time-trial performance under the tested conditions.
- • Population: n=42 trained runners.
- • Protocol cues (title/abstract): 1000 mg • 4 weeks • 2200 m • 3000 m.
Protocol
Protocol (as reported)
- • Intervention/exposure: altitude (vs placebo).
- • Dose/time/duration cues in abstract/title: 1000 mg • 4 weeks • 2200 m • 3000 m.
- • Outcomes: VO₂max, Time-trial performance.
- • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.
Fit
Who it may help, and who should be cautious
Who it helps
- • Athletes similar to the study population (n=42 trained runners) working on altitude.
- • Athletes who can measure VO₂max, Time-trial performance with a repeatable workout or time-trial effort.
Who should be cautious
- • 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 (double-blind, placebo-controlled).
- • Population: n=42 trained runners.
- • Comparator: placebo.
- • Outcomes measured: VO₂max, Time-trial performance.
- • Protocol cues mentioned: 1000 mg • 4 weeks • 2200 m • 3000 m.
- • Source: PubMed PMID 40839339 (2025) — Sports medicine (Auckland, N.Z.).
Results excerpt
What the abstract reports
“Running performance (3000 m time trial) was not significantly improved in either treatment group (UA; p = 0.116, PL; p = 0.771), although UA supplementation significantly lowered ratings of perceived exertion (RPE, p = 0.02) and reduced indirect markers of post-exercise muscle damage…”
Note: excerpts are short; for full context, read the paper.
Limits
Limitations and 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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