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Related Experiment Videos

Exercise effects during diving and decompression on postdive venous gas emboli.

Louis W Jankowski1, Peter Tikuisis, Ronald Y Nishi

  • 1Exercise Science Department, Concordia University, McGill University Montreal, Quebec, Canada.

Aviation, Space, and Environmental Medicine
|June 17, 2004
PubMed
Summary

Performing moderate exercise during decompression significantly reduces venous gas emboli (VGE) activity after diving. This contrasts with the belief that exercise increases decompression sickness (DCS) risk.

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Area of Science:

  • Physiology
  • Hyperbaric Medicine
  • Diving Science

Background:

  • Exercise during diving is often linked to increased decompression sickness (DCS) risk.
  • Limited research exists on exercise's effects during decompression.
  • Previous evidence suggested a potential benefit, prompting this study.

Purpose of the Study:

  • To investigate the impact of moderate, intermittent exercise during diving and/or decompression on venous gas emboli (VGE) activity.
  • To determine if exercise during decompression reduces VGE compared to inactivity.

Main Methods:

  • 39 healthy males underwent compression to 450 kPa (45 msw) for 30 min.
  • Staged decompression lasted 55 min, with subjects either active or inactive.
  • Activity involved 5-min exercise intervals during the bottom phase and/or decompression; VGE monitored via Doppler.

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Main Results:

  • Exercise during the bottom phase had no effect on VGE activity.
  • Performing moderate exercise during decompression significantly reduced VGE activity (p < 0.05) compared to inactive decompression.
  • All VGE indices showed significant reduction with exercise during decompression.

Conclusions:

  • Moderate, intermittent physical activity during the decompression phase effectively decreases VGE activity post-dive.
  • Findings challenge the traditional view of exercise increasing DCS risk during decompression.
  • Exercise during decompression may be a viable strategy to mitigate VGE formation.