Study note • PMID 25471271
Autonomic modulations of heart rate variability and performances in short-distance elite swimmers.
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: athlete/trained context.
- • Consistency: single-study evidence.
- • Practical recommendation depends on tolerance, context, and whether it protects training consistency.
ELI5
In plain language
Endurance exercise is associated with high cardiac vagal tone, but how the cardiac autonomic control correlates with shorter anaerobic performances is unknown. (controlled study; elite athletes).
The abstract doesn’t indicate a clear change in Recovery speed 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: Endurance exercise is associated with high cardiac vagal tone, but how the cardiac autonomic control correlates with shorter anaerobic performances is unknown.
- • The abstract doesn’t indicate a clear change in Recovery speed under the tested conditions.
- • Population: elite athletes.
- • Protocol cues (title/abstract): 1 min.
Protocol
Protocol (as reported)
- • Intervention/exposure: heart rate variability, hrv.
- • Dose/time/duration cues in abstract/title: 1 min.
- • Outcomes: Recovery speed.
- • 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 (elite athletes) working on monitoring.
- • Athletes who can measure Recovery speed 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: elite athletes.
- • Outcomes measured: Recovery speed.
- • Protocol cues mentioned: 1 min.
- • Source: PubMed PMID 25471271 (2015) — European journal of applied physiology.
Results excerpt
What the abstract reports
“Vagal indices were highest in the morning where they positively correlated with very short-distance times (higher the index, worse is the 50-m performance).”
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.
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