Mechanical and physical factors in lung function during work in dense environments

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Mechanical and physical factors in lung function during work in dense environments

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Title: Mechanical and physical factors in lung function during work in dense environments
Author: Van Liew, HD
Abstract: The major effects of breathing dense gas during physical exercise in hyperbaric environments can be traced to high airway resistance during inspiration and expiration and especially to an increased tendency for lung airways to become "choked" during expiration. The body's responses to the high resistance include decrease of alveolar ventilation, which leads to CO2 retention. This hypoventilation is aggravated by poor mixing in the lung because of low diffusivity of gases in the dense environment. Also, there is a tendency for the person to let the end-expired volume of the lung enlarge; this causes a marked increase of work against elastic recoil of pulmonary structures. Because the elastic work occurs during the inspiratory phase of a breath, there is a disproportionate increase of the work of the inspiratory muscles that may lead to fatigue of inspiratory musculature and consequent aggravation of the hypoventilation. Airway Resistance Atmosphere Exposure Chambers *Atmospheric Pressure *Exertion Gases Human Hypoventilation/etiology Lung Compliance Pulmonary Diffusing Capacity *Respiration Support, U.S. Gov't, P.H.S. Work of Breathing
Description: Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org )
URI: PMID: 6636348
http://archive.rubicon-foundation.org/2972
Date: 1983

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  • Undersea Biomedical Research Journal
    The Undersea Baromedical Research journal was published by the Undersea Medical Society, Inc. (now the Undersea and Hyperbaric Medical Society) quarterly from 1974 to 1992 when the name changed to the Undersea and Hyperbaric Medicine Journal.

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