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Exercise during a 3-min decompression stop reduces postdive venous gas bubbles.

Zeljko Dujić1, Ivan Palada, Ante Obad

  • 1Department of Physiology and Biophysics, University of Split School of Medicine, Split, Croatia. zdujic@bsb.mefst.hr

Medicine and Science in Sports and Exercise
|August 25, 2005
PubMed
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Mild exercise during decompression significantly reduces gas bubbles in divers, preventing decompression sickness. This underwater swimming method aids safe ascent after dives.

Area of Science:

  • Physiology
  • Diving Medicine
  • Cardiovascular Health

Background:

  • Decompression sickness (DCS) results from gas bubble formation during ascent.
  • The role of exercise in mitigating DCS bubble formation remains debated.
  • Previous research indicated strenuous exercise 24 hours pre-dive reduces venous bubbles.

Purpose of the Study:

  • To investigate the impact of mild, continuous exercise during decompression on gas bubble formation.
  • To assess if underwater swimming during ascent can reduce post-dive venous gas emboli.

Main Methods:

  • Ten military divers performed 30m air dives for 30 minutes.
  • Subjects engaged in fin underwater swimming at 30% maximal oxygen uptake during a 3-minute decompression.
  • Venous gas emboli were monitored via ultrasound post-dive under rest and cough conditions.

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Main Results:

  • Mild exercise during decompression significantly reduced bubble formation in the pulmonary artery.
  • Average bubbles decreased from 0.9 to 0.3 bubbles/cm² at rest.
  • Bubble counts during the two-cough procedure dropped from 4.6 to 0.9 bubbles/cm².

Conclusions:

  • Mild underwater swimming during a 3-minute decompression phase effectively reduces post-dive gas bubbles.
  • This exercise strategy shows promise for enhancing diving safety.
  • No DCS symptoms were reported by participants during the study.