Effect of the Depth of Cold Water Immersion on Sleep Architecture and Recovery Among Well-Trained Male Endurance Runners.

Study note • PMID 33870188

Effect of the Depth of Cold Water Immersion on Sleep Architecture and Recovery Among Well-Trained Male Endurance Runners.

ELI5

In plain language

Takeaways

What the abstract suggests

• • Study question: Introduction: The aim of the present study was to investigate the effect of the depth of cold water immersion (CWI) (whole-body with head immersed and partial-body CWI) after high-intensity,…
• • Results section: no clear change in Recovery speed under the tested conditions.
• • Population: n=12 well-trained runners.
• • Protocol cues (full paper): 300 mg • 15 days • 2 days • 1 week • 3 days • 38 min.

Protocol

Protocol (as reported)

• • Intervention/exposure: cold water immersion, recovery (vs control condition).
• • Dose/time/duration cues found in the full paper: 300 mg • 15 days • 2 days • 1 week • 3 days • 38 min • 30 min • 6 h.
• • Outcomes: Recovery speed.
• • Replication note: abstracts often omit adherence and timing; confirm details before changing training or supplementation.

Fit

Who it helps, and who should skip it

Methods

What the study actually did

• • Design: randomized trial (randomized, crossover).
• • Population: n=12 well-trained runners.
• • Comparator: control condition.
• • Outcomes measured: Recovery speed.
• • Protocol cues mentioned: 10 min • 48 h • 80 min • 180 min.
• • Source: PubMed PMID 33870188 (2021) — Frontiers in sports and active living.

Full paper

What the full paper adds

• • Design features (paper): randomized, crossover.
• • Participants (paper): n=12 well-trained runners.
• • More protocol detail (paper): 300 mg • 15 days • 2 days • 1 week • 3 days • 38 min • 30 min • 6 h.
• • Results section: no clear change in Recovery speed under the tested conditions.

Results excerpt

What the abstract reports

“Slow-wave sleep (SWS) proportion was higher (p < 0.05) during the first 180 min of the night in WHOLE compared with PARTIAL.”

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.