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CISDOC database

Document ID (ISN)101201
CIS number 03-399
ISSN - Serial title 0095-6562 - Aviation, Space, and Environmental Medicine
Year 2002
Convention or series no.
Author(s) Pilmanis A.A., Webb J.T., Kannan N., Balldin U.
Title The effect of repeated altitude exposures on the incidence of decompression sickness
Bibliographic information June 2002, Vol.73, No.6, p.525-531. Illus. 28 ref.
Abstract Repeated hypobaric exposures in a single day occurring during parachute training, hypobaric chamber training, unpressurized flight and extravehicular space activity can cause decompression sickness (DCS). To test the hypothesis that short exposures with and without ground intervals would result in a lower incidence of DCS than a single exposure of equal duration, 32 subjects were exposed to three different hypobaric exposures: a single 2h continuous exposure (condition A, control); four 30min exposures but no ground interval between the exposures (condition B); four 30min exposures and a 60min period of ground interval between exposures (condition C). All exposures were to a simulated altitude of 7500m with 100% oxygen breathing. Subjects were examined for symptoms of DCS and precordial venous gas emboli (VGE). Results indicate that repeated simulated altitude exposures to 7500m significantly reduce DCS and VGE incidence compared with a single continuous exposure of equivalent duration.
Descriptors (primary) negative pressure; decompression sickness; space travel; length of exposure; exposure tests; aircraft
Descriptors (secondary) air embolism; simulation facilities; oxygen; hypobaric facilities; exposure evaluation
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Transport and communications
Broad subject area(s) Physical hazards
Browse category(ies) Biological monitoring
Hyperbaric pressure
Space travel
Air transportation
Hypobaric pressure