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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Subudhi, Andrew W. Fan, Jui-Lin Evero, Oghenero Bourdillon, Nicolas Kayser, Bengt Julian, Colleen G. Lovering, Andrew T. Panerai, Ronney B. Roach, Robert C. |
| Description | Author Affiliation: Subudhi AW ( University of Colorado Altitude Research Center, Department of Emergency Medicine, Anschutz Medical Campus, Aurora, Colorado) |
| Abstract | Cerebral autoregulation (CA) acts to maintain brain blood flow despite fluctuations in perfusion pressure. Acute hypoxia is thought to impair CA, but it is unclear if CA is affected by acclimatization or related to the development of acute mountain sickness (AMS). We assessed changes in CA using transfer function analysis of spontaneous fluctuations in radial artery blood pressure (indwelling catheter) and resulting changes in middle cerebral artery blood flow velocity (transcranial Doppler) in 21 active individuals at sea level upon arrival at 5,260 m (ALT1), after 16 days of acclimatization (ALT16), and upon re-exposure to 5,260 m after 7 days at 1,525 m (POST7). The Lake Louise Questionnaire was used to evaluate AMS symptom severity. CA was impaired upon arrival at ALT1 (P < 0.001) and did not change with acclimatization at ALT16 or upon re-exposure at POST7. CA was not associated with AMS symptoms (all R < 0.50, P > 0.05). These findings suggest that alterations in CA are an intrinsic consequence of hypoxia and are not directly related to the occurrence or severity of AMS. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 7 |
| Volume Number | 116 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2014-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Acclimatization Altitude Sickness Physiopathology Cerebrovascular Circulation Anoxia Middle Cerebral Artery Acute Disease Diagnosis Arterial Pressure Blood Flow Velocity Homeostasis Radial Artery Severity Of Illness Index Questionnaires Time Factors Ultrasonography, Doppler, Transcranial Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s. |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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