Exercise exacerbates acute mountain sickness at simulated high altitude
Roach, R.C., Maes, D., Sandoval, D., Robergs, R.A., Icenogle, M., Hinghofer-Szalkay, H., Lium, D., & Loeppky, J.A. (2000) Exercise exacerbates acute mountain sickness at simulated high altitude. Journal of Applied Physiology, 88(2), pp. 581-585.
We hypothesized that exercise would cause greater severity and incidence of acute mountain sickness (AMS) in the early hours of exposure to altitude. After passive ascent to simulated high altitude in a decompression chamber [barometric pressure = 429 Torr, ~4,800 m (J. B. West, J. Appl. Physiol. 81: 1850-1854, 1996)], seven men exercised (Ex) at 50% of their altitude-specific maximal workload four times for 30 min in the first 6 h of a 10-h exposure. On another day they completed the same protocol but were sedentary (Sed). Measurements included an AMS symptom score, resting minute ventilation (V̇E), pulmonary function, arterial oxygen saturation (Sa(O2)), fluid input, and urine volume. Symptoms of AMS were worse in Ex than Sed, with peak AMS scores of 4.4 ± 1.0 and 1.3 ± 0.4 in Ex and Sed, respectively (P < 0.01); but resting V̇E and Sa(O2) were not different between trials. However, Sa(O2) during the exercise bouts in Ex was at 76.3 ± 1.7%, lower than during either Sed or at rest in Ex (81.4 ± 1.8 and 82.2 ± 2.6%, respectively, P < 0.01). Fluid intake-urine volume shifted to slightly positive values in Ex at 3-6 h (P = 0.06). The mechanism(s) responsible for the rise in severity and incidence of AMS in Ex may be sought in the observed exercise-induced exaggeration of arterial hypoxemia, in the minor fluid shift, or in a combination of these factors.
Impact and interest:
Citation counts are sourced monthly from and citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
|Item Type:||Journal Article|
|Keywords:||oxygen, adult; altitude disease; article; controlled study; disease severity; edema; exercise; fluid balance; fluid intake; human; human experiment; male; normal human; oxygen saturation; priority journal; simulation; sitting; symptomatology; urine volume, NASA Discipline Environmental Health; NASA Program Biomedical Research and Countermeasures; Non-NASA Center, Acute Disease; Adult; Altitude; Altitude Sickness; Atmospheric Pressure; Drinking; Exercise; Humans; Kidney; Kidney Function Tests; Male; Severity of Illness Index; Urination|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Schools > School of Exercise & Nutrition Sciences
|Deposited On:||21 Jul 2016 03:23|
|Last Modified:||21 Jul 2016 03:23|
Repository Staff Only: item control page