Components of aircraft life support systems interact with each other and the user
The life support system in a tactical aircraft provides necessary supplemental oxygen to the aircrew. However, interactions among its various components may generate unexpected breathing loads. We focus here on the interactions between a regulator and breathing mask commonly used together in the U.S...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-09-01
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| Series: | Frontiers in Physiology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fphys.2022.969167/full |
| _version_ | 1828228472101666816 |
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| author | F. Eric Robinson Barbara E. Shykoff Barbara E. Shykoff Dan E. Warkander Dan E. Warkander |
| author_facet | F. Eric Robinson Barbara E. Shykoff Barbara E. Shykoff Dan E. Warkander Dan E. Warkander |
| author_sort | F. Eric Robinson |
| collection | DOAJ |
| description | The life support system in a tactical aircraft provides necessary supplemental oxygen to the aircrew. However, interactions among its various components may generate unexpected breathing loads. We focus here on the interactions between a regulator and breathing mask commonly used together in the U.S. Navy, the CRU-103 regulator and MBU 23/P mask, and some effects of the interactions on the user. The data reported were collected during a larger research effort examining potential physiological and cognitive effects of low regulator inlet pressures. Seventeen participants completed a series of tasks under mild exercise while breathing 40% O2 (balance N2) from an MBU-23/P mask supplied by a CRU-103 regulator with supply pressures 10, 6, 4, and 2 psig (CRU-103 specifications are for inlet pressures from 5 to 120 psig). Variables measured included flow to the mask and pressures at the regulator supply, in the hose to the mask, and in the mask. In addition to restricting inspiratory flow, low inlet pressure to the CRU-103 caused a counterintuitive overshoot in gas delivery pressure at end-inspiration, a mean increase of 1.5 cm H2O between the 10- and 2 psig conditions. The added pressure to the exhalation valve increased the expiratory threshold, the pressure to start expiratory flow, by approximately 2 cm H2O, increasing the effort needed to exhale. |
| first_indexed | 2024-04-12T18:20:51Z |
| format | Article |
| id | doaj.art-a0423296046a4a5e8cc30ee0c7f0c960 |
| institution | Directory Open Access Journal |
| issn | 1664-042X |
| language | English |
| last_indexed | 2024-04-12T18:20:51Z |
| publishDate | 2022-09-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physiology |
| spelling | doaj.art-a0423296046a4a5e8cc30ee0c7f0c9602022-12-22T03:21:27ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2022-09-011310.3389/fphys.2022.969167969167Components of aircraft life support systems interact with each other and the userF. Eric Robinson0Barbara E. Shykoff1Barbara E. Shykoff2Dan E. Warkander3Dan E. Warkander4Naval Aerospace Medical Research Laboratory, Naval Medical Research Unit Dayton, Wright-Patterson Air Force Base, Dayton, OH, United StatesNaval Aerospace Medical Research Laboratory, Naval Medical Research Unit Dayton, Wright-Patterson Air Force Base, Dayton, OH, United StatesOak Ridge Institute for Science and Engineering, Oak Ridge, TN, United StatesNaval Aerospace Medical Research Laboratory, Naval Medical Research Unit Dayton, Wright-Patterson Air Force Base, Dayton, OH, United StatesOak Ridge Institute for Science and Engineering, Oak Ridge, TN, United StatesThe life support system in a tactical aircraft provides necessary supplemental oxygen to the aircrew. However, interactions among its various components may generate unexpected breathing loads. We focus here on the interactions between a regulator and breathing mask commonly used together in the U.S. Navy, the CRU-103 regulator and MBU 23/P mask, and some effects of the interactions on the user. The data reported were collected during a larger research effort examining potential physiological and cognitive effects of low regulator inlet pressures. Seventeen participants completed a series of tasks under mild exercise while breathing 40% O2 (balance N2) from an MBU-23/P mask supplied by a CRU-103 regulator with supply pressures 10, 6, 4, and 2 psig (CRU-103 specifications are for inlet pressures from 5 to 120 psig). Variables measured included flow to the mask and pressures at the regulator supply, in the hose to the mask, and in the mask. In addition to restricting inspiratory flow, low inlet pressure to the CRU-103 caused a counterintuitive overshoot in gas delivery pressure at end-inspiration, a mean increase of 1.5 cm H2O between the 10- and 2 psig conditions. The added pressure to the exhalation valve increased the expiratory threshold, the pressure to start expiratory flow, by approximately 2 cm H2O, increasing the effort needed to exhale.https://www.frontiersin.org/articles/10.3389/fphys.2022.969167/fullrespirationlife support system (LSS)regulatorbreathing resistancework of breathing |
| spellingShingle | F. Eric Robinson Barbara E. Shykoff Barbara E. Shykoff Dan E. Warkander Dan E. Warkander Components of aircraft life support systems interact with each other and the user Frontiers in Physiology respiration life support system (LSS) regulator breathing resistance work of breathing |
| title | Components of aircraft life support systems interact with each other and the user |
| title_full | Components of aircraft life support systems interact with each other and the user |
| title_fullStr | Components of aircraft life support systems interact with each other and the user |
| title_full_unstemmed | Components of aircraft life support systems interact with each other and the user |
| title_short | Components of aircraft life support systems interact with each other and the user |
| title_sort | components of aircraft life support systems interact with each other and the user |
| topic | respiration life support system (LSS) regulator breathing resistance work of breathing |
| url | https://www.frontiersin.org/articles/10.3389/fphys.2022.969167/full |
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