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Hot water immersion improves sleep quality in athletes

Hot water immersion (HWI) significantly improved sleep quality in athletes compared to control conditions, while cold water immersion (CWI) did not show consistent benefits for sleep. The review included eight studies and found HWI also enhanced acute anaerobic power, whereas CWI impaired immediate power output.

Last updated: Jul 28, 2026•1 RCTs•📖 Read as article →

Evidence Score

Evidence Score42/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Effects of post-exercise hot and cold-water immersion on performance recovery and physiological markers in athletes: a systematic review.

rct

Bustos Carvajal J, Pérez Hurtado E, Bustos Carvajal M, Celis Villamizar DM, Arias Coronel F · Frontiers in sports and active living (2026)

Participants: 8
Duration: N/A
Intervention: Post-exercise hot water immersion (HWI) vs. cold water immersion (CWI) vs. control
Outcome: Sleep quality, acute anaerobic power, DOMS, fatigue, biochemical markers (CK, cytokines, HSP-72, testosterone, cortisol)
Effect Size: N/A
Population: Athletes or physically active individuals

Result: Hot water immersion (HWI) significantly improved sleep quality in athletes compared to control conditions, while cold water immersion (CWI) did not show consistent benefits for sleep. The review included eight studies and found HWI also enhanced acute anaerobic power, whereas CWI impaired immediate power output.

PubMed: 42491492DOI: 10.3389/fspor.2026.1794029

Mechanism Graph

Post-exercise hot water immersion induces vasodilation and increases core body temperature
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Elevated core temperature promotes thermoregulatory cooling and relaxation
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Enhanced parasympathetic nervous system activity facilitates sleep onset and quality
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Result: Improved sleep quality and acute anaerobic power

Limitations

  • ⚠Only eight studies were included, limiting generalizability
  • ⚠Heterogeneity in immersion protocols (temperature, duration, timing) across studies

Frequently Asked Questions

Does hot water immersion improve sleep quality in athletes?▼

Yes, the systematic review found that hot water immersion significantly improved sleep quality compared to control conditions.

How does cold water immersion affect performance recovery?▼

Cold water immersion impaired immediate power output and did not consistently reduce DOMS or improve perceived recovery compared to control.

What biochemical changes occur with hot water immersion?▼

Chronic hot water immersion reduced creatine kinase (CK) levels and increased testosterone, while cold water immersion elevated HSP-72.

Should athletes choose hot or cold water immersion for recovery?▼

The choice depends on athletic goals: hot water immersion may benefit sleep and anaerobic performance, while cold water immersion may hinder immediate power and induce cellular stress adaptations.

Products

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References

  1. 1.Bustos Carvajal J, Pérez Hurtado E, Bustos Carvajal M, Celis Villamizar DM, Arias Coronel F. "Effects of post-exercise hot and cold-water immersion on performance recovery and physiological markers in athletes: a systematic review.." Frontiers in sports and active living, 2026. PMID: 42491492 DOI: 10.3389/fspor.2026.1794029
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.