Exercise Effects during Diving and Decompression on Postdive Venous Gas Emboli

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Authors
  1. Jankowski, L.W.
  2. Tikuisis, P.
  3. Nishi, R.Y.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN)
Abstract
Physical activity during decompression has generally been avoided due to a popular belief that exercise increases the risk of decompression sickness. Based on observational and theoretical evidence to the contrary, this study was conducted to quantify the effect of moderate exercise during decompression on venous gas emboli (VGE) activity after diving. VGE observed at both the precordium and subclavian vein sites after diving should be reduced if moderate exercise is performed during decompression vs. remaining inactive. In a water-filled hyperbaric chamber, 39 healthy males subjects were compressed to a pressure of 450 kPa (45 msw) for 30 minutes followed by 55 minutes of staged decompression. Subjects were either active or inactive at the bottom phase (450 kPa) and/or during the decompression. Activity comprised three 5-minute intervals of moderate arm or leg exercise at the bottom and five such intervals during decompression. After decompression, VGE were monitored at the precordium and subclavian vein sites using Doppler detection. Bubble activity scores were converted to various indices and analysed using non-parametric statistics. Results: VGE activity was invariant to whether subjects were active or sedentary during the bottom phase of the dive. However, it was significantly lower (i.e., for all indices examined) after dives in which exercise was performed during decompression vs. inactive decompression.

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Keywords
Bubbles;Doppler;Diving;DCS risk;Physical activity;Decompression
Report Number
DRDC-TORONTO-SL-2002-167 — Scientific Literature
Date of publication
01 Jun 2004
Number of Pages
7
Reprinted from
Aviation, Space and Environment Medicine, vol 75, no 6, 2004, p 489-495
DSTKIM No
CA025907
CANDIS No
523665
Format(s):
Electronic Document(PDF)

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