Pre-dive vibration effect on bubble formation after a 30-m dive requiring a decompression stop.
BACKGROUND
The preconditioning of divers to reduce post-dive decompression sickness (DCS) has gained increased interest in diving medical research over the last few years. The beneficial effects of physical exercise, oxygen breathing, hyperbaric exposure, heat exposure, hyperhydration, or nitroglycerin administration before the dive are only a few examples of ongoing research. In this work, we investigated the effects of pre-dive whole-body vibration on post-dive bubble formation.


METHODS
Following French Navy standard dive procedures, 14 healthy male military divers performed 2 identical dives 1 wk apart to 30 m of seawater (msw) for 30 min. One of the dives was randomly preceded by a 30-min whole-body vibration session (frequencies 35-40 Hz) 1 h before the dive. Post-dive bubbles were measured precordially 30, 60, and 90 min after the dive and were graded according to the Kissman Integrated Severity Score (KISS) protocol, with and without knee flexing. Arterial endothelial function was measured before and after vibration using flow mediated dilation (FMD) measurement.


RESULTS
A significant reduction in bubble scores was observed after the "vibration" dive.


CONCLUSIONS
As there was no observed change in FMD after vibration, we do not believe a nitric oxide mediated mechanism is involved; rather, a mechanical dislodgement or enhanced lymphatic elimination of gas nuclei is hypothesized.
Germonpré
Peter
P
Centre for Hyperbaric Oxygen Therapy, Military Hospital Brussels, Rue Bruyn, 1 B-1120 Brussels, Belgium. peter.germonpre@mil.be
Pontier
Jean-Michel
JM
Gempp
Emmanuel
E
Blatteau
Jean-Eric
JE
Deneweth
Stefaan
S
Lafère
Pierre
P
Marroni
Alessandro
A
Balestra
Costantino
C
D000328:Adult; D003665:Decompression Sickness / Q000517:prevention & control*; D004242:Diving / Q000502:physiology*; D004618:Embolism, Air / Q000517:prevention & control*; D006801:Humans; D008297:Male; D014732:Vibration / Q000627:therapeutic use*; D055815:Young Adult