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The effect of pre-dive exercise timing, intensity and mode on post-decompression venous gas emboli
KTH, School of Technology and Health (STH), Environmental Physiology.
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2011 (English)In: Diving and Hyperbaric Medicine, ISSN 1833-3516, Vol. 41, no 4, 183-188 p.Article in journal (Refereed) Published
Abstract [en]

 Introduction: The effect of pre-dive exercise on post-decompression venous gas emboli (VGE) remains contentious. The aim of our study was to investigate the effect of timing, intensity and mode of exercise before diving on post-decompression VGE production. Methods: Fifteen male volunteers performed three identical 100 min chamber dives to 18 metres' sea water. Two of the three dives were conducted with prior exercise at 24 or 2 h; a dive without prior exercise formed the control. Moderate-intensity impact exercise consisted of jogging on the spot for one minute followed by ten star jumps, repeated for a total of 40 min at 70% of maximum heart rate. Post-dive Doppler monitoring began within 2 mm of surfacing and was carried out for at least 180 min VGE were assessed using the Kisman-Masurel (KM) code and the Kisman Integrated Severity Score (KISS). Results: The median peak KM grade for each condition following the dives was not significantly different. Pre-dive exercise at 2 h resulted in a significant reduction in the mean KISS compared to the control (11.3 versus 17.2, P < 0.04, Wilcoxon sign-ranked test). Moderate-intensity jogging/star jump exercise used in this series of dives resulted in significantly lower mean KISS (11.3 versus 21.8, P < 0.04) and median KM grade over 180 min (P < 0.006, Mann Whitney U test) compared to high-intensity cycling exercise used in our previous study. Conclusions: This study suggests that moderate-intensity impact exercise reduces VGE production when conducted 2 h prior to diving.

Place, publisher, year, edition, pages
2011. Vol. 41, no 4, 183-188 p.
Keyword [en]
Doppler, diving, exercise, bubbles, decompression illness
National Category
Medical and Health Sciences
URN: urn:nbn:se:kth:diva-55240ISI: 000297789700003ScopusID: 2-s2.0-82855178112OAI: diva2:474466
QC 20120109Available from: 2012-01-09 Created: 2012-01-02 Last updated: 2012-01-09Bibliographically approved

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