Spirometry and Pulmonary Barotrauma in Escape Training

By Rubicon Foundation editorial team

5 min read · 2 November 2026

Spirometric indices and the risk of pulmonary barotrauma in submarine escape training is a 1999 journal article by Benton PJ and colleagues, published in Undersea and Hyperbaric Medicine Journal 26(4). It addresses the relationship between lung-function measurements and pulmonary barotrauma during submarine escape training, a question with implications for respiratory assessment in diving medicine.

Why examine lung function during submarine escape?

Submarine escape training exposes participants to a demanding underwater ascent. As pressure falls during ascent, gas in the lungs expands. If expanding gas cannot leave the lungs freely, pressure differences can injure lung tissue; this is pulmonary barotrauma.

The central concern is not simply how much air a person can move, but how the respiratory system behaves under changing pressure and during ascent. A lung-function measure may help describe airflow or lung volume, yet its practical meaning depends on the mechanism of injury and the conditions of the escape.

What does spirometry measure?

Spirometry records how much air a person can exhale and how quickly. Common indices describe forced expiratory volume, forced vital capacity and the relationship between them. These measurements can help identify airflow obstruction, but they do not directly reproduce the pressure changes or breathing behaviour of an underwater ascent.

That distinction matters when interpreting a title that links spirometric indices with risk. A measured association would need to be considered alongside the limits of the test, the training environment and the biological pathway leading to injury. Spirometry is one part of respiratory assessment, not a complete model of escape physiology.

Airflow: how readily air moves out of the lungs during forced expiration.
Lung volume: the amount of air exhaled under specified test conditions.
Pressure change: the fall in ambient pressure during ascent, which allows trapped gas to expand.
Barotrauma: tissue injury caused by a pressure difference across an air-containing space.

How can expanding gas injure the lungs?

During ascent, ambient pressure decreases and gas within the lungs expands. In ordinary diving, a diver who breathes continuously and keeps the airway open can usually exhale expanding gas. The risk changes if gas is trapped behind narrowed or obstructed airways, or if breathing and ascent conditions prevent adequate gas release.

Overexpansion can damage alveoli, the small air sacs where gas exchange occurs. Pulmonary barotrauma may also allow gas to enter spaces where it does not normally belong, with potentially serious consequences. The precise injury pattern depends on where gas travels and the extent of tissue damage.

Why does the training setting matter?

Escape training is a specific operational setting, not a direct substitute for every recreational, occupational or scientific dive. The physical demands, ascent procedure, breathing equipment and participant selection can shape both exposure and the meaning of a respiratory measurement. Risk cannot be inferred from a spirometric value alone.

Research linking lung-function indices to escape-related injury belongs to a wider effort to understand how respiratory characteristics interact with pressure, gas movement and exposure. For diving physicians and hyperbaric clinicians, the broader question is how to interpret a test in context rather than treating a single measurement as a universal predictor.

What should readers take from this research topic?

The article’s subject is the possible relationship between spirometry and pulmonary barotrauma risk in submarine escape training. That makes it relevant to clinicians assessing respiratory fitness, researchers studying pressure-related injury and anyone interested in how physiological tests are applied to specialised diving environments.

General knowledge of lung mechanics can explain why airflow limitation or gas trapping deserves attention, but personal fitness decisions require individual assessment. If you have a respiratory condition or are being evaluated for diving or escape training, consult a diving-medicine physician familiar with the relevant activity.

Frequently asked questions

What is pulmonary barotrauma?

It is lung injury caused by a pressure difference, including injury that can occur when gas expands during ascent and cannot escape normally.

Can spirometry predict whether someone will have barotrauma?

Spirometry measures aspects of airflow and lung volume. Its interpretation for a particular person or exposure depends on clinical context and cannot replace an individual diving-medicine assessment.

Why is submarine escape training a distinct research setting?

It involves a defined underwater ascent and training environment. Its procedures and exposure conditions may differ from other forms of diving, so findings from one setting should not automatically be applied to another.

Citation details

Title: Spirometric indices and the risk of pulmonary barotrauma in submarine escape training
Authors: Benton PJ; Francis TJ; Pethybridge RJ
Year: 1999
Published in: Undersea and Hyperbaric Medicine Journal 26(4)
Identifiers: PMID 10642066
Record type: Journal article
Repository record: Rubicon Research Repository, handle 123456789/2309

This page is an original summary written by the Rubicon editors from the publication’s bibliographic record. It does not reproduce the paper, its abstract or its data; consult the publication itself for its methods and findings.