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Aerobic exercise before diving reduces venous gas bubble formation in humans
Zeljko Dujic1, Darko Duplancic, Ivana Marinovic-Terzic
1Department of Physiology and Biophysics, University of Split School of Medicine, Split, Croatia. zdujic@bsb.mefst.hr
The Journal of Physiology
|February 3, 2004
Summary
Pre-dive exercise significantly reduces decompression sickness (DCS) by decreasing venous gas emboli. A single strenuous exercise bout 24 hours before a simulated dive lowered bubble formation and severity in divers.
Area of Science:
- Physiology
- Hyperbaric Medicine
- Exercise Science
Background:
- Previous rat studies indicated exercise reduces decompression sickness (DCS).
- The protective effect of pre-dive exercise on bubble formation in humans remained uninvestigated.
Purpose of the Study:
- To investigate the efficacy of a single bout of strenuous exercise prior to a simulated dive in reducing venous gas emboli and DCS risk in human divers.
Main Methods:
- Twelve healthy male divers underwent two randomized simulated dives (18m seawater) in a hyperbaric chamber.
- One dive condition included a 40-minute interval exercise protocol 24 hours prior; the other did not.
- Venous gas bubbles were monitored post-dive using ultrasound.
Main Results:
- Pre-dive exercise significantly reduced average bubble count (0.98 to 0.22 bubbles cm⁻²) (P=0.006).
- The maximum bubble grade decreased from 3 to 1.5 (P=0.002) with pre-dive exercise.
- Exercise enhanced safety by mitigating bubble formation.
Conclusions:
- A single bout of strenuous exercise 24 hours before diving can significantly reduce bubble formation in human divers.
- Pre-dive exercise shows promise as a novel strategy for preventing decompression sickness.
- This study provides the first human evidence supporting exercise as a prophylactic measure against DCS.