|
1. Pre-'dive' exercise reduces bubble grade after diving. |
Citation/s:
1. Blatteau J-E, Boussuges A, Castagna, Gempp E, Pontier J-N, Robinet OC,
Galland F-M. A 2-hours pre-dive aerobic exercise decreases bubble formation
after diving. ICHM-EUBS Proceedings 2005, Desola J (Ed).
Three-part Clinical Question: For individuals breathing compressed
air, does exercise before exposure decrease post-exposure bubble formation?
Search Terms: gas nuclei, decompression illness, venous gas embolism
The Study:
Non-blinded randomised crossover trial with intention-to-treat.
The Study Patients: Healthy volunteer military divers.
Control group (Two groups of N = 16; 16 analysed): No exercise or diving
for two days before exposure to 400kPa (approx 30metres) for 30 minutes
breathing air in a hyperbaric chamber.
Experimental group (Two groups of N = 16; 16 analysed): As above but two
exercise regimens. Either 45 minutes of endurance running at about 70% of
maximum theoretical heart rate starting 2 hours before exposure, or 40 minutes
at the heart rate corresponding to ventilatory threshold.
The Evidence:
|
Non-Event
Outcomes |
Time to
outcome/s |
Control
groups |
Exercise
groups |
P-value |
|
Peak bubble grade (45 minutes exercise) |
60 minutes |
Median 1 (IQR 0 to 2) |
Median 0 (IQR 0 to 1) |
0.004 |
|
Peak bubble grade (40 minutes exercise) |
60 minutes |
|
|
0.023 |
Comments:
1. Confusing study design involving crossover and two different exercise
regimens. We have assumed that no individuals were crossed between the two
exercise regimens. Difference in exercise intensity is not clear.
2. Data given for 45 minute group comparison only.
3. Non-peer reviewed short report in conference proceedings.
Appraised by: Sean Hopson, Mike Bennett, POWH, Sydney ; Friday, 1 September
2006
Email: sean@thegasman.org
Kill or Update By: September 2007