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Effect of a Single Simulated 500 m Saturation Dive on Lung Function
Background: Whether deep saturation diving causes injury to lung function remains controversial and the mechanism is unclear. The present study aimed to evaluate the effects of a 500 m simulated single saturation dive on lung function. Methods: A retrospective study was performed in nine professiona...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9201418/ https://www.ncbi.nlm.nih.gov/pubmed/35721530 http://dx.doi.org/10.3389/fphys.2022.911167 |
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author | Lian, Ningfang Wang, Sijiao Hu, Lijuan Xue, Liping Gong, Ying Li, Li Yang, Yanjie Zhu, Lei |
author_facet | Lian, Ningfang Wang, Sijiao Hu, Lijuan Xue, Liping Gong, Ying Li, Li Yang, Yanjie Zhu, Lei |
author_sort | Lian, Ningfang |
collection | PubMed |
description | Background: Whether deep saturation diving causes injury to lung function remains controversial and the mechanism is unclear. The present study aimed to evaluate the effects of a 500 m simulated single saturation dive on lung function. Methods: A retrospective study was performed in nine professional divers who spent 176 h in a high-pressure environment simulating a depth of 500-m saturation dive (51 atm, 5.02 Mpa). Pulmonary function parameters were investigated and compared before and on 3 days after the dive. Results: Nine professional divers aged (36 ± 7) years were enrolled. Three days after the dive, the parameters related to expiratory flow (forced expiratory volume in 1 s (FEV(1))/forced vital capacity (FVC)) were decreased; the parameters related to small airway function (forced expiratory flow at 50%, 75% of FVC exhaled and forced mid-expiratory flow) were decreased compared with those before the dive (both p < 0.05). Additionally, after the dive, the parameters related to pulmonary diffusion function were decreased compared with those before the dive (both p < 0.05). The parameters related to lung volume (residual volume, vital capacity and total lung volume) and those related to respiratory exertion (peak expiratory flow and forced expiratory flow at 75% of FVC exhaled) were not significantly different between after and before the dive. Two divers with small airway dysfunction before the dive had obstructive ventilatory dysfunction after the dive. Additionally, mild obstructive ventilatory dysfunction in three divers before the dive became severe after the dive. After a bronchial dilation test, five divers showed improvement of FEV(1), which ranged from 0.10 to 0.55 L. Chest radiographs and echocardiography of all divers were normal after diving. Conclusion: 500 m simulated saturation diving induces a decrease in small airway function and diffusion function. This injury may be associated with small airway and diffusion membrane lesions. |
format | Online Article Text |
id | pubmed-9201418 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-92014182022-06-17 Effect of a Single Simulated 500 m Saturation Dive on Lung Function Lian, Ningfang Wang, Sijiao Hu, Lijuan Xue, Liping Gong, Ying Li, Li Yang, Yanjie Zhu, Lei Front Physiol Physiology Background: Whether deep saturation diving causes injury to lung function remains controversial and the mechanism is unclear. The present study aimed to evaluate the effects of a 500 m simulated single saturation dive on lung function. Methods: A retrospective study was performed in nine professional divers who spent 176 h in a high-pressure environment simulating a depth of 500-m saturation dive (51 atm, 5.02 Mpa). Pulmonary function parameters were investigated and compared before and on 3 days after the dive. Results: Nine professional divers aged (36 ± 7) years were enrolled. Three days after the dive, the parameters related to expiratory flow (forced expiratory volume in 1 s (FEV(1))/forced vital capacity (FVC)) were decreased; the parameters related to small airway function (forced expiratory flow at 50%, 75% of FVC exhaled and forced mid-expiratory flow) were decreased compared with those before the dive (both p < 0.05). Additionally, after the dive, the parameters related to pulmonary diffusion function were decreased compared with those before the dive (both p < 0.05). The parameters related to lung volume (residual volume, vital capacity and total lung volume) and those related to respiratory exertion (peak expiratory flow and forced expiratory flow at 75% of FVC exhaled) were not significantly different between after and before the dive. Two divers with small airway dysfunction before the dive had obstructive ventilatory dysfunction after the dive. Additionally, mild obstructive ventilatory dysfunction in three divers before the dive became severe after the dive. After a bronchial dilation test, five divers showed improvement of FEV(1), which ranged from 0.10 to 0.55 L. Chest radiographs and echocardiography of all divers were normal after diving. Conclusion: 500 m simulated saturation diving induces a decrease in small airway function and diffusion function. This injury may be associated with small airway and diffusion membrane lesions. Frontiers Media S.A. 2022-06-02 /pmc/articles/PMC9201418/ /pubmed/35721530 http://dx.doi.org/10.3389/fphys.2022.911167 Text en Copyright © 2022 Lian, Wang, Hu, Xue, Gong, Li, Yang and Zhu. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Physiology Lian, Ningfang Wang, Sijiao Hu, Lijuan Xue, Liping Gong, Ying Li, Li Yang, Yanjie Zhu, Lei Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title | Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title_full | Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title_fullStr | Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title_full_unstemmed | Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title_short | Effect of a Single Simulated 500 m Saturation Dive on Lung Function |
title_sort | effect of a single simulated 500 m saturation dive on lung function |
topic | Physiology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9201418/ https://www.ncbi.nlm.nih.gov/pubmed/35721530 http://dx.doi.org/10.3389/fphys.2022.911167 |
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