Study note • PMID 15358751
Branched-chain amino acid supplementation and human performance when hypohydrated in the heat.
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: controlled study.
- • Population relevance: mixed/unclear athlete specificity.
- • Consistency: single-study evidence.
- • Practical recommendation depends on tolerance, context, and whether it protects training consistency.
ELI5
In plain language
The serotonin system may contribute to reduced human performance when hypohydrated in the heat. (controlled study; participants).
The abstract doesn’t indicate a clear change in Performance in heat 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: The serotonin system may contribute to reduced human performance when hypohydrated in the heat.
- • The abstract doesn’t indicate a clear change in Performance in heat under the tested conditions.
- • Population: participants.
- • Protocol cues (title/abstract): 60 min.
Protocol
Protocol (as reported)
- • Intervention/exposure: branched, chain.
- • Dose/time/duration cues in abstract/title: 60 min.
- • Outcomes: Performance in heat.
- • 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 (participants) working on heat.
- • Athletes who can measure Performance in heat 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: controlled study.
- • Population: participants.
- • Outcomes measured: Performance in heat.
- • Protocol cues mentioned: 60 min.
- • Source: PubMed PMID 15358751 (2004) — Journal of applied physiology (Bethesda, Md. : 1985).
Results excerpt
What the abstract reports
“Cardiovascular and thermoregulatory data were also similar between trials.”
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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Performance Science Lab
Research summaries for endurance athletes, with study context, practical protocols, and clear limitations.
Heat performance research
Heat changes pacing, hydration, and fueling — and it can be trained like altitude with fewer logistics.
Performance in heat research for endurance athletes
Heat punishes ego pacing; you need acclimation and cooling strategy to execute.