Effect of High AltitudeNCT02730182
Effect of High Altitude Exposure, Acclimatization and Re-exposure on Postural Control in Lowlanders
A study testing altitude exposure in people with Effect of High Altitude, run by University of Zurich at 1 site in Switzerland.
Trial summary
Prospective interventional trial in lowlanders evaluating the effect of acute exposure, acclimatization and re-exposure to high altitude on postural control Read more about this study
- Who is it for?
- Ages 18 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Effect of High Altitude
- What is being tested?
- altitude exposure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 21 participants
- Where
- 1 siteSwitzerland
- Study dates
- 9 Apr 2016to 4 May 2016
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- born, raised and currently living <800m
- No overnight stay at altitudes >1500 m 4 weeks before the study
Who cannot join
- Previous altitude intolerance to altitude <3000 m
- Pregnancy
- Health impairment, which requires regular treatment
Trial locations and contacts
1 site in 1 country.
About this study
Prospective interventional trial in lowlanders evaluating the effect of acute exposure, acclimatization and re-exposure to high altitude on postural control
Read the detailed description
Baseline measurements including the assessment of the center of pressure during 30s, the cerebral oxygen saturation and a sharpened Romberg test will be performed in Santiago de Chile, 520 m, over the course of 3 days. Participants will then travel by commercial airline (5 h flight) and by bus (3 h ride) to the base camp of the Atacama Large Millimeter/Submillimeter Array (ALMA) telescope station located at 2900 m near San Pedro de Atacama, northern Chile. Participants will stay there for the next 8 nights and they will be spend the days (6-8 h daily) at the telescope station at 5050 m while undergoing testing as described above at the first and the last day at 5050m. Daily transports from 2900 to 5050 m will be by car (1 h ride, one way). After the first 8 day altitude sojourn participants will return to the Santiago area (520 m) for a 6 day recovery period.
A second altitude sojourn with an identical schedule as the one described above and a final low altitude stay of 3 days will follow.
- Conditions
- Effect of High Altitude
- Being tested
- altitude exposure
- Keywords
- postural control, high altitude
- Medical subject headings
- Altitude Sickness
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
altitude exposureOther
altitude exposure
| Study group | Role | What they receive |
|---|---|---|
| Altitude exposure | Experimental | Acute high altitude exposure followed by 8 day acclimatization and reexposure for 8 days after 6 days at low altitude Receives: Other: altitude exposure |
What is being measured
The primary outcome is the main question the study is designed to answer.
Center of pressure path length measured by Wii-balance board
Changes in center of pressure path length during the 2 sojourns at 5050 m and compared to lowland.
Measured: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Secondary outcomes (2)
Cerebral tissue oxygen saturation measured by near infrared spectroscopy
Changes in cerebral oxygen saturation during the 2 sojourns at 5050 m and compared to lowland.
Measured: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Postural stability measured by sharpened Romberg-test and heel-to-toe walk
Changes in postural stability during the 2 sojourns at 5050 m and compared to lowland.
Measured: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted6 Apr 2016 (estimated)
- Study start9 Apr 2016
- Primary completion4 May 2016
- Study completion4 May 2016
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Effect of High AltitudeStudies of the same condition, open and under way.
- More trials run by University of ZurichThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 21 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Zurich
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Konrad E Bloch, MD, Study chair, University of Zurich
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT02730182
- Sponsor's protocol ID
- REB15-2709_V3
- Status last verified
- Jan 2019
- First submitted
- 31 Mar 2016
- Last updated
- 17 Jan 2019
- Results posted
- No
- Data monitoring committee
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 17 Jan 2019. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effect of High Altitude Exposure, Acclimatization and Re-exposure on Postural Control in Lowlanders
- ClinicalTrials.gov ID
- NCT02730182
- Acronym / sponsor ID
- REB15-2709_V3
- Conditions
- Effect of High Altitude
- Keywords
- postural control, high altitude
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 21 participants (actual)
- Lead sponsor
- University of ZurichUniversity, hospital or other
- Study start
- 9 Apr 2016 (actual)
- Primary completion
- 4 May 2016 (actual)
- Study completion
- 4 May 2016 (actual)
- First posted
- 6 Apr 2016 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Prospective interventional trial in lowlanders evaluating the effect of acute exposure, acclimatization and re-exposure to high altitude on postural control
Detailed description
Baseline measurements including the assessment of the center of pressure during 30s, the cerebral oxygen saturation and a sharpened Romberg test will be performed in Santiago de Chile, 520 m, over the course of 3 days. Participants will then travel by commercial airline (5 h flight) and by bus (3 h ride) to the base camp of the Atacama Large Millimeter/Submillimeter Array (ALMA) telescope station located at 2900 m near San Pedro de Atacama, northern Chile. Participants will stay there for the next 8 nights and they will be spend the days (6-8 h daily) at the telescope station at 5050 m while undergoing testing as described above at the first and the last day at 5050m. Daily transports from 2900 to 5050 m will be by car (1 h ride, one way). After the first 8 day altitude sojourn participants will return to the Santiago area (520 m) for a 6 day recovery period.
A second altitude sojourn with an identical schedule as the one described above and a final low altitude stay of 3 days will follow.
Study design
- Primary purpose
- Prevention
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Altitude exposure | Experimental | Other: altitude exposureAcute high altitude exposure followed by 8 day acclimatization and reexposure for 8 days after 6 days at low altitude |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- born, raised and currently living <800m
- No overnight stay at altitudes >1500 m 4 weeks before the study
Key exclusion criteria (3 listed)
- Previous altitude intolerance to altitude <3000 m
- Pregnancy
- Health impairment, which requires regular treatment
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| altitude exposurealtitude exposure | Other | Altitude exposure |
Primary outcome
Center of pressure path length measured by Wii-balance board
Time frame: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Changes in center of pressure path length during the 2 sojourns at 5050 m and compared to lowland.
2 secondary outcomes
Cerebral tissue oxygen saturation measured by near infrared spectroscopy
Time frame: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Postural stability measured by sharpened Romberg-test and heel-to-toe walk
Time frame: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 17 Jan 2019.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Konrad E Bloch, MD study chair
University of Zurich
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing altitude exposure in people with Effect of High Altitude, run by University of Zurich at 1 site in Switzerland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 17 Jan 2019. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Switzerland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Center of pressure path length measured by Wii-balance board (time frame: Low altitude sojourn at 520 m; first sojourn at 5050 m Day 2, 7; second sojourn at 5050 m Day 2, 7). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Jan 2019.