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Study note

Influence of cold-water immersion on recovery of elite triathletes following the ironman world championship.

PMID 29685828 (2018): cold water immersion, recovery — Recovery speed, Time-trial performance, Performance in heat (study note for endurance athletes).

Updated Jul 23, 2026

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Study note • PMID 29685828

Influence of cold-water immersion on recovery of elite triathletes following the ironman world championship.

Journal of science and medicine in sport • 2018 • DOI 10.1016/j.jsams.2017.12.011
Open on PubMed

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

Cold water immersion (CWI) has been widely used for enhancing athlete recovery though its use following an Ironman triathlon has never been examined. (randomized trial; triathletes).

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: Cold water immersion (CWI) has been widely used for enhancing athlete recovery though its use following an Ironman triathlon has never been examined.
  • • The abstract doesn’t indicate a clear change in Recovery speed under the tested conditions.
  • • Population: triathletes.
  • • Protocol cues (title/abstract): 16h • 40h.

Protocol

Protocol (as reported)

  • • Intervention/exposure: cold water immersion, recovery (vs control group).
  • • Dose/time/duration cues in abstract/title: 16h • 40h.
  • • Outcomes: Recovery speed, Time-trial performance, 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 (triathletes) working on recovery.
  • • Athletes who can measure Recovery speed, Time-trial performance, 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: randomized trial.
  • • Population: triathletes.
  • • Comparator: control group.
  • • Outcomes measured: Recovery speed, Time-trial performance, Performance in heat.
  • • Protocol cues mentioned: 16h • 40h.
  • • Source: PubMed PMID 29685828 (2018) — Journal of science and medicine in sport.

Results excerpt

What the abstract reports

“No significant group by time interactions occurred.”

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.

One cold plunge did not accelerate measured Ironman recovery

Thirty-three Ironman World Championship athletes received either 10 minutes of 10°C cold-water immersion or no intervention after racing. Muscle-damage, inflammation, soreness and hydration markers changed over the following 40 hours, but the groups did not differ significantly.

Do not treat a post-race cold plunge as a proven shortcut to physiological recovery. If cold water feels good and is safe for you, it can remain a comfort choice; the higher-priority recovery plan is time, sleep, food, fluid and a gradual return to load.

This study tested one immediate protocol in elite-event participants and followed outcomes for 40 hours, so it cannot rule on every temperature, duration or later subjective effect. Check the measurements in the PubMed record.

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Sources