Hypobaric chamber

  A hypobaric chamber, or altitude chamber, is a chamber used during aerospace or high terrestrial altitude research or training to simulate the effects of high altitude on the human body, especially hypoxia (low oxygen) and hypobaria (low ambient air pressure). Some chambers also control for temperature and relative humidity.

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Procedure

One or more subjects (usually, pilots or crew members, though anyone interested in the effects of high altitude can usually arrange a visit) are placed in the chamber. Before "ascending" to the desired altitude, subjects pre-breathe oxygen from oxygen masks to purge nitrogen from their bloodstream so decompression sickness (DCS) does not occur. With masks in place, the atmospheric pressure inside the chamber is then reduced to simulate altitudes of up to tens of thousands of feet. The subjects then remove their oxygen masks and experience the symptoms of hypoxia. An inside safety observer, breathing oxygen by mask, should always be present to place a subject's mask back on in the event a subject passes out unconscious. Outside observers monitor the subjects' condition via closed circuit television and viewing ports.

While the mask is off, subjects may be asked to do trivial tasks, such as arithmetic and signing their own name. When such tasks start taking excessive lengths of time to be done or are done poorly, it is usually a sign that the "Time of Useful Consciousness" has been exceeded and that the mask should be replaced. Subjects may also insure that they are able to do tasks such as clear their nose and sinuses easily, as pain from such problems can be a major distraction in an emergency such as rapid decompression.

Use in research

Use in training

The primary purpose of the altitude chamber is for the subjects to determine what their hypoxia symptoms are. The symptoms of hypoxia are different for each individual, and this training is helpful for aviators to be able to recognize these symptoms during actual flight so as to avoid in-flight oxygen emergencies. Pilots who fly aircraft at altitudes in excess of 10,000 feet must use oxygen equipment. Altitude chamber training is required of U.S. military aviators every five years. The FAA and some larger airlines also require their pilots to periodically take altitude chamber training. Anyone with a pilot certificate in the United States who has a current Class I or Class II medical certificate can normally sign up and receive altitude training from the government.

There are many procedures followed during chamber training for aircrew. Usually new aircrew will undergo a familiarization profile, where the chamber ascends to an altitude of 10,000ft. During the ascent they are instructed on the proper procedure to clear the ears. During ascent, students are asked to yawn and on descent they need to perform the valsalva technique. If they perform the valsalva during ascent, they risk suffering barotrauma of the ear. This is because the ears are suceptible to Boyle's Law.

There are also other profiles, such a hypoxia training profile, where the chamber ascends to an altitude of 25,000ft. Upon arriving at 25,000ft, students are removed from their oxygen supply two at a time, for around 2 to 3 minutes. During this time, they will be asked to complete simple tasks such as copying shapes on a piece of paper. They are asked during the time off oxygen how they feel. After being placed back on oxygen, they see how their judgement was impaired during the time that they were experiencing hypoxia.

The training goes further with radid decompression profiles, where the chamber is very rapidly ascended from 8,000ft to 22,000ft within 10 to 20 seconds, to simulate the loss of a cabin door. For fighter pilots this is done from an altitude of 25,000ft to 43,000ft within 5 seconds which simulates the loss of a fighter aircraft's canopy.

Institutions with hypobaric chambers

• U.S. Army Institute of Environmental Medicine, Natick, MA, 33 years experience with its Hypobaric Chamber Facility

• University of North Dakota's John D. Odegard School of Aerospace Sciences, Aviation Training

• Naval Operational Medicine Institute provides operational medical and survival training and consultative services to military forces worldwide.

• Arizona State University Polytechnic Campus Aircrew training, research, and other uses. Available to the public by appointment.

See also

• Hyperbaric chamber, in contrast to hypobaric chambers, these place subjects under increased atmospheric pressure.