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Related Experiment Video

Updated: Jul 13, 2026

Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography

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[Developing and testing of decompression regimes for caisson operations while constructing Moscow metro]

S V Rodchenkov¹, A V Syrovegin, I A Shulagin

¹Institute of Oceanology of PP Shirshov RAN, Moscow.

Aviakosmicheskaia I Ekologicheskaia Meditsina = Aerospace and Environmental Medicine

|January 1, 1996

Summary

New decompression schedules for caisson work up to 5 atmospheres absolute (ata) were developed and tested. While no decompression sickness occurred, air embolism was observed, increasing with pressure exposure and leg movement.

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Area of Science:

Physiology
Occupational Health
Diving and Hyperbaric Medicine

Context:

Caisson operations involve significant pressure exposure, necessitating stringent decompression protocols.
Existing caisson regulations may not cover extended duration or higher pressure exposures.
Human physiological responses to novel decompression profiles require thorough investigation.

Purpose:

To develop and validate extended decompression regimes for caisson operations up to 5 atmospheres absolute (ata).
To assess the safety and physiological effects of these novel decompression schedules in human subjects.
To evaluate the incidence of decompression sickness and air embolism under tested conditions.

Summary:

Developed and tested novel decompression schedules for caisson work exceeding current regulatory limits (up to 5 ata).
Seventeen subjects underwent 54 tests in a dry altitude chamber; no decompression sickness was observed.
Air embolism occurred in 28% at rest and 72% during leg movements, with incidence rising with pressure exposure.

Impact:

Provides validated, extended decompression protocols for caisson operations, potentially enhancing safety and efficiency.
Highlights the increased risk of air embolism, particularly with physical activity, during prolonged hyperbaric exposure.
Informs future revisions of caisson safety regulations and occupational health guidelines for hyperbaric environments.