{"title":"Application of Hyperbaric Oxygen Preconditioning to Improve Pilot′s Lower Body Negative Pressure Tolerance","authors":"Ye Liu","doi":"10.3760/CMA.J.ISSN.1007-6239.2018.02.002","DOIUrl":null,"url":null,"abstract":"\n Objective: To investigate whether the preconditioning of hyperbaric oxygen (HBO)can improve the tolerance of lower body negative pressure in pilots . Methods: Twenty healthy male fighter pilots were selected as subjects .The multiple HBO chamber was used and 3-time HBO exposure scheme was chosen .The chamber pressure was gradually increased to 2.5 atmospheres absolute (ATA) in 10 min and maintained for 65 min (with twice 30-min mask oxygen breathing and 5-min interval .Then the pressure was gradually reduced to 1.3 ATA in 10 min and returned to normal pressure in 5 min after staying for 5 min .Such 95-min test was undertaken once a day (set at 15:30--17:05) and repeated for 3 days .The lower body negative pressure tolerance was measured before and after HBO preconditioned and self-contrasted . Results: The cumulative stress index was significantly increased from(-1353.50±449 .95) to(-1843.50± 522 0.7) by 3 rounds HBO pretreatment (t =11.10,P<0.05) and it indicated that the lower body negative pressure tolerance had been improved . Conclusions: Hyperbaric oxygen preconditioning can improve the pilot’s lower body negative pressure tolerance","PeriodicalId":9904,"journal":{"name":"Chinese Journal of Aerospace Medicine","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2018-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Aerospace Medicine","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.3760/CMA.J.ISSN.1007-6239.2018.02.002","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Objective: To investigate whether the preconditioning of hyperbaric oxygen (HBO)can improve the tolerance of lower body negative pressure in pilots . Methods: Twenty healthy male fighter pilots were selected as subjects .The multiple HBO chamber was used and 3-time HBO exposure scheme was chosen .The chamber pressure was gradually increased to 2.5 atmospheres absolute (ATA) in 10 min and maintained for 65 min (with twice 30-min mask oxygen breathing and 5-min interval .Then the pressure was gradually reduced to 1.3 ATA in 10 min and returned to normal pressure in 5 min after staying for 5 min .Such 95-min test was undertaken once a day (set at 15:30--17:05) and repeated for 3 days .The lower body negative pressure tolerance was measured before and after HBO preconditioned and self-contrasted . Results: The cumulative stress index was significantly increased from(-1353.50±449 .95) to(-1843.50± 522 0.7) by 3 rounds HBO pretreatment (t =11.10,P<0.05) and it indicated that the lower body negative pressure tolerance had been improved . Conclusions: Hyperbaric oxygen preconditioning can improve the pilot’s lower body negative pressure tolerance