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Re: Don't dive cold when you don't have to.

Neal W Pollock1

  • 1Center for Hyperbaric Medicine and Environmental Physiology, Duke University Medical Center and Divers Alert Network, Durham NC, USA,

Diving and Hyperbaric Medicine
|September 29, 2015
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Summary

Divers' thermal status significantly impacts decompression sickness risk. Maintaining a cool temperature during descent and bottom phases, followed by controlled warming during ascent, minimizes decompression stress and enhances safety.

Keywords:
Decompression sicknesshypothermialetters (to the Editor)risk factors

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Area of Science:

  • Physiological impacts of thermal stress on divers.
  • Decompression sickness (DCS) risk factors.
  • Diving physiology and safety.

Background:

  • Earlier reports highlighted thermal status importance in diving.
  • Warm conditions during dives increase post-dive bubble scores and DCS risk.
  • Hot water suits correlate with higher DCS rates than drysuits.

Discussion:

  • The US Navy Experimental Diving Unit (NEDU) study elegantly assessed thermal stress impacts.
  • Dives simulated different thermal exposures: warm/cold vs. cold/warm.
  • Results showed significantly lower DCS rates with a cold/warm profile.

Key Insights:

  • Diving in cooler temperatures during descent/bottom phases reduces DCS risk.
  • Excessive warming increases inert gas uptake, compromising decompression.
  • Sudden warming during ascent can promote bubble formation and DCS symptoms.

Outlook:

  • Active heating systems require careful management to avoid extreme thermal shifts.
  • Further research needed to integrate thermal status into decompression algorithms.
  • Divers must be aware of thermal status effects for safe diving practices.