Short-term effect of reduction in forced vital capacity after diving exposure
- Published
- Accepted
- Subject Areas
- Respiratory Medicine, Science and Medical Education
- Keywords
- hyperbaric exposure, Forced Vital Capacity, SCUBA Diving
- Copyright
- © 2017 Cheng
- Licence
- This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ Preprints) and either DOI or URL of the article must be cited.
- Cite this article
- 2017. Short-term effect of reduction in forced vital capacity after diving exposure. PeerJ Preprints 5:e3027v2 https://doi.org/10.7287/peerj.preprints.3027v2
Abstract
To discuss whether there is relationship between short-term and long-time attenuation effects of ventilation caused by diving activity. The ventilation observed before and after hyperbaric exposure for 20min by case-control experiments. Participants of the experimental group (EG) stayed for 20min under 12-m underwater and the control group (CG) stayed in hyperbaric chamber under pressure of 2.2ATA. Immediate effects of pulmonary ventilation detected by the Spirometer and compared by paired T test to reveal the different caused by environmental pressure. The Vital Capacity (VC) rises while the Minute Ventilation (MV), Maximal Voluntary Ventilation (MVV) decreases after the exposure for 20min in both groups. The Forced Vital Capacity (FVC) is detected decreased significantly in EG (t=1.21, P =0.25) while it slightly increased in CG (t=-0.42, P =0.68).The ratio of Forced Expiratory Volume in one second to VC (FEV1.0/VC %) increase in EG (t=-0.73, P=0.48) while decrease in CG (t=0.42, P=0.17). The Ratio of FEV1.0 to FVC (FEV1.0 %) values increase obviously in EG (t=-1.48, P =0.16) and a bit in CG (t=-0.23, P =0.82). High pressure is the common factor in both groups that leads the changes in the same trend in VC, MV and MVV. Extra factors as immersion effect, loading of diving equipment and low temperature underwater, would encounter EG participants. Instant reduced effects of FVC under diving exposure in the study are quite consistent with the long-term cumulative effect of professional divers in previous research, which illustrated even small depth of short-range diving exercise have definite influences on ventilation.
Author Comment
In the second version, I had made some changes in the Title, Keywords, Abstract.
There are also changes in the main manuscript mainly in word expressions to highlight the study results for more readability and comprehension for our reviewers.
Most researchs thought ventilation attenuate often happened in professional divers due to long-term cumulative effects after years and years of diving exercises. This study confirmed that the reduction of Forced Vital Capacity starts in every single dive.
Supplemental Information
data of ventilation fucntion in EG &CG
1.valid data of ventilation function in EG &CG pre- and post- hyperbaric exposure.
2.Data of Experimental Group underwater
3.Raw data for the article including unvalid data.
