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Effect of six days of staging on physiologic adjustments and acute mountain sickness during ascent to 4300 meters.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Beidleman, Beth A. Fulco, Charles S. Muza, Stephen R. Rock, Paul B. Staab, Janet E. Forte, Vincent A. Cymerman, Allen |
| Copyright Year | 2009 |
| Abstract | This study determined the effectiveness of 6 days (d) of staging at 2200 m on physiologic adjustments and acute mountain sickness (AMS) during rapid, high-risk ascent to 4300 m. Eleven sea-level (SL) resident men (means +/- SD; 21 +/- 3 yr; 78 +/- 13 kg) completed resting measures of end-tidal CO(2) (Petco(2)), arterial oxygen saturation (Sao(2)), heart rate (HR), and mean arterial pressure (MAP) at SL and within 1 h of exposure to 4300 m in a hypobaric chamber prior to 6 d of staging at 2200 m (preSTG) and on the summit of Pikes Peak following 6 d of staging at 2200 m (postSTG). Immediately following resting ventilation measures, all performed submaximal exercise ( approximately 55% of altitude-specific maximal oxygen uptake) for approximately 2 h on a bicycle ergometer to induce higher levels of AMS. AMS-C, calculated from the Environmental Symptoms Questionnaire, was measured following 4 h and 8 h of exposure at preSTG and postSTG, and the mean was calculated. Resting Petco(2) (mmHg) was unchanged from SL (39.8 +/- 2.6) to preSTG (39.3 +/- 3.0), but decreased (p < 0.05) from preSTG to postSTG (32.8 +/- 2.6). Resting Sao(2) (%) decreased (p < 0.05) from SL (97 +/- 2) to preSTG (80 +/- 4) and increased (p < 0.05) from preSTG to postSTG (83 +/- 3). Resting HR (bpm) and MAP (mmHg) did not change in any of the test conditions. The incidence and severity of AMS-C decreased (p < 0.05) from preSTG (91 +/- 30%; 1.05 +/- 0.56) to postSTG (45 +/- 53%; 0.59 +/- 0.43), respectively. These results suggest that modest physiologic adjustments induced by staging for 6 d at 2200 m reduced the incidence and severity of AMS during rapid, high-risk ascent to 4300 m. |
| Starting Page | 363 |
| Ending Page | 373 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.dtic.mil/get-tr-doc/pdf?AD=ADA506547&Location=U2&doc=GetTRDoc.pdf |
| Alternate Webpage(s) | http://www.dtic.mil/dtic/tr/fulltext/u2/a506547.pdf |
| PubMed reference number | 19775215v1 |
| Alternate Webpage(s) | https://doi.org/10.1089/ham.2009.1004 |
| DOI | 10.1089/ham.2009.1004 |
| Journal | High altitude medicine & biology |
| Volume Number | 10 |
| Issue Number | 3 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | ABLEPHARON-MACROSTOMIA SYNDROME Acclimatization Adaptation, Physiological Altitude Sickness CNS disorder Down-Regulation Eighty Esocidae Hematology (discipline) Illness (finding) Oxygen saturation test result Physiological Sexual Disorders Respiration Rest TWIST2 wt Allele acute mountain sickness benefit pediatric acute myeloblastic leukemia torr |
| Content Type | Text |
| Resource Type | Article |
