Oxidative Stress in Hypobaric Hypoxia

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01436383
Recruitment Status : Completed
First Posted : September 19, 2011
Last Update Posted : September 21, 2011
Swiss National Science Foundation
Kantonsspital Aarau
Information provided by:
University Hospital Inselspital, Berne

Brief Summary:
The trial investigates changes in metabolism during high altitude expedition up to 6865m. A mass-spectrometry based platform is used to detect different oxidative stress related metabolites. Symptoms of acute mountain sickness are evaluated and correlated with laboratory parameters.

Condition or disease Intervention/treatment Phase
Hypobaric Hypoxia Metabolomics Oxidative Stress Acute Mountain Sickness Other: Hypoxic exposure Not Applicable

Detailed Description:


Altitude related illness, which include acute mountain sickness (AMS), high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE), is common in subjects exposed to high altitude during professional or leisure time activities. There are independent risk factors such as: individual susceptibility and rate of ascent. HAPE is a potentially life-threatening complication of high altitude stay, mostly occuring within the first 2-5 days of exposure. Although there is a controversial discussion, excessive hypoxic pulmonary vasoconstriction is thought to be the main trigger for developing HAPE. Beside the controversial discussion if hypobaric hypoxia leads to oxidative stress it is not known whether oxidative stress contributes to AMS or HAPE.


The investigators hypothesize that reactive oxygen species are generated during high altitude stay and contribute to the development of acute mountain sickness. Furthermore they would like to describe other changes in metabolic pathways possibly contributing to vessel tone dysregulation.


36 healthy volunteers will examined during an high altitude medical research expedition to Mount Muztagh ata (7549m) in Western China. Acute mountain sickness scores and clinical parameters will be assessed. Metabolomics analysis of more than 390 parameters, using a mass spectrometry-based targeted metabolomic platform, is used to detect systemic oxidative stress and functional impairment of enzymes that require oxidation-sensitive co-factors. Furthermore routine laboratory test will be done, for example CRP, creatinine and interleukines

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 36 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: Oxidative Stress in Hypobaric Hypoxia and Influence on Vessel-tone Modifying Mediators
Study Start Date : March 2005
Actual Primary Completion Date : December 2005
Actual Study Completion Date : February 2010

Resource links provided by the National Library of Medicine

Intervention Details:
  • Other: Hypoxic exposure
    Hypoxic exposure

Primary Outcome Measures :
  1. Number of volunteers with acute mountain sickness [ Time Frame: during ascent, expected to be approximately 19-23 days ]

Secondary Outcome Measures :
  1. Change from baseline in oxygen saturation in blood [ Time Frame: during ascent, expected to be approximately 19-23 days ]
  2. Changes from baseline in oxidative stress [ Time Frame: during ascent, expected to be approximately 19-23 days ]
  3. Changes from baseline in different metabolic pathways [ Time Frame: during ascent, expected to be approximately 19-23 days ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • healthy
  • physical fit
  • mountaineering experience
  • 18-70 years

Exclusion Criteria

  • any type of disease
  • regular intake of medicaments
  • history of high altitude pulmonary edema
  • severe acute mountain sickness below an altitude of 3500m
  • any history of high altitude cerebral edema

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01436383

Center of Laboratory Medicine
Aarau, Switzerland, 5001
Sponsors and Collaborators
University Hospital Inselspital, Berne
Swiss National Science Foundation
Kantonsspital Aarau
Study Chair: Andreas Huber, Prof. Dr. med. Center of Laboratory Medicine, Cantonal Hospital Aarau, 5001 Aarau

Responsible Party: Prof. Dr. med. A. R. Huber, Center of Laboratory Medicine, Kantonsspital Aarau Identifier: NCT01436383     History of Changes
Other Study ID Numbers: KEK 1189
SNSF 3200B0-108300
First Posted: September 19, 2011    Key Record Dates
Last Update Posted: September 21, 2011
Last Verified: September 2011

Keywords provided by University Hospital Inselspital, Berne:
high altitude
hypobaric hypoxia
oxidative stress
acute mountain sickness

Additional relevant MeSH terms:
Altitude Sickness
Signs and Symptoms, Respiratory
Signs and Symptoms
Respiration Disorders
Respiratory Tract Diseases