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Exercise ending 30 min pre-dive has no effect on bubble formation in the rat
Vegard J Berge1, Arve Jørgensen, Are Løset
1Department of Circulation and Medical Imaging, Faculty of Medicine, NTNU, Trondheim, Norway. vegardbe@stud.ntnu.no
Aviation, Space, and Environmental Medicine
|April 15, 2005
Summary
Exercise 30 minutes before a dive does not affect bubble formation or decompression sickness risk in rats. Previous research showed exercise 20 hours prior to a dive reduces bubbles.
Area of Science:
- Physiology
- Diving Medicine
- Exercise Science
Background:
- Previous studies demonstrated that exercise 20 hours before diving significantly reduces bubble formation in rats and humans.
- Exercise performed closer to the dive did not prevent bubble formation.
Purpose of the Study:
- To investigate whether exercise 30 minutes prior to a simulated dive promotes bubble formation in rats.
- To assess the risk of decompression sickness associated with pre-dive exercise.
Main Methods:
- 58 Sprague-Dawley rats were divided into sedentary and exercise groups.
- The exercise group underwent 90 minutes of treadmill running at high intensity (up to 90% VO2max).
- 30 minutes post-exercise, rats underwent a simulated dive (700 kPa for 45 min) breathing air, followed by decompression. Bubble formation was measured post-dive.
Main Results:
- No significant differences were observed in survival rates, median bubble grade, survival time, or the incidence of severe bubble scores between the exercise and control groups.
- Bubble formation and decompression sickness indicators remained comparable between rats that exercised 30 minutes before the dive and sedentary controls.
Conclusions:
- Exercise performed 30 minutes before a dive neither promotes nor reduces bubble formation.
- Pre-dive exercise at this timing does not appear to increase the risk of decompression sickness in rats.