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Exercise limitation of Acetazolamide at altitude (3459 m)
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Bradwell, Arthur R., Myers, Stephen D., Beazley, Maggie, Ashdown, Kimberly, Harris, Nick G., Bradwell, Susie B., Goodhart, Jamie, Imray, C. (Chris), Wimalasena, Yashvi, Edsell, Mark E., Pattinson, Kyle T.S., Wright, Alex D. and Harris, Stephen J. (2014) Exercise limitation of Acetazolamide at altitude (3459 m). Wilderness & Environmental Medicine, Volume 25 (Number 3). pp. 272-277. doi:10.1016/j.wem.2014.04.003 ISSN 1080-6032.
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Official URL: http://dx.doi.org/10.1016/j.wem.2014.04.003
Abstract
Objective
To assess the effect of acetazolamide (Az) on exercise performance during early acclimatization to altitude.
Methods
Az (250 mg twice daily) or placebo was administered for 3 days in a double-blind, randomized manner followed by a rapid ascent to 3459 m in the Italian Alps. Twenty healthy adults (age range, 18–67 years) were tested at 60% of sea-level peak power output for 15 minutes on a bicycle ergometer after 16 to 27 hours of altitude exposure. Exercise performance was measured in relation to peripheral oxygen saturations measured from pulse oximetry (Spo2), Lake Louise acute mountain sickness (AMS) score, and perceived difficulty.
Results
At altitude, resting Spo2 was higher in the Az group compared with placebo (P < .001). The highest AMS scores were in 4 of the placebo individuals with the lowest resting Spo2 (P < .05). During the exercise test, Spo2 fell in all but 1 subject (P < .001) and was reduced more in the Az group (P < .01). Four Az and 1 placebo subject were unable to complete the exercise test; 4 of these 5 had the largest fall in Spo2. The perception of exercise difficulty was higher in the Az subjects compared with those taking the placebo (P < .01). There was an age relationship with exercise limitation; 4 of the 9 older than 50 years failed to complete the test whereas only 1 of 11 younger than 50 years failed, and there were no failures in the 6 younger than 30 years (P < .05).
Conclusions
In this study group, and despite higher resting Spo2, Az may have compromised exercise at 3459 m altitude during early acclimatization, particularly in older subjects.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine > Metabolic and Vascular Health (- until July 2016) Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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| Journal or Publication Title: | Wilderness & Environmental Medicine | ||||||
| Publisher: | Elsevier Inc. | ||||||
| ISSN: | 1080-6032 | ||||||
| Official Date: | September 2014 | ||||||
| Dates: |
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| Volume: | Volume 25 | ||||||
| Number: | Number 3 | ||||||
| Page Range: | pp. 272-277 | ||||||
| DOI: | 10.1016/j.wem.2014.04.003 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
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