Document Detail


Response to CO2 in novice closed-circuit apparatus divers and after 1 year of active oxygen diving at shallow depths.
MedLine Citation:
PMID:  15608093     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Elevated arterial Pco(2) (hypercapnia) has a major effect on central nervous system oxygen toxicity in diving with a closed-circuit breathing apparatus. The purpose of the present study was to follow up the ability of divers to detect CO(2) and to determine the CO(2) retention trait after 1 year of active oxygen diving with closed-circuit apparatus. Ventilatory and perceptual responses to variations in inspired CO(2) (range: 0-5.6 kPa, 0-42 Torr) during moderate exercise were assessed in Israeli Navy combat divers on active duty. Tests were carried out on 40 divers during the novice oxygen diving phase (ND) and the experienced oxygen diving phase. No significant changes were found between the two phases for the minimal mean inspired Pco(2) that could be detected. The mean (with SD in parentheses) end-tidal Pco(2) during exposure to an inspired Pco(2) of 5.6 kPa (42 Torr) was significantly higher in the novice diving phase than in the experienced diving phase [8.1 kPa (SD 0.7), 62 Torr (SD 5) and 7.8 kPa (SD 0.6), 59 Torr (SD 4), respectively; P < or = 0.001]. One year of shallow oxygen diving activity with a closed-circuit apparatus does not affect the ability to detect CO(2) nor does it lead to increased CO(2) retention; rather, it may even bring about a decrease in this trait. This finding suggests that acquiring experience in oxygen diving with a closed-circuit apparatus at shallow depths does not place the diver at a greater risk of central nervous system oxygen toxicity due to CO(2) retention.
Authors:
Mirit Eynan; Ran Arieli; Yochai Adir
Related Documents :
16708533 - Cns toxicity in closed-circuit oxygen diving: symptoms reported from 2527 dives.
17298213 - Excessive oxygen uptake during exercise and recovery in heavy exercise.
16944403 - The response of the novel pro-inflammatory molecules s100a8/a9 to exercise.
Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2004-12-17
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  98     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-04-14     Completed Date:  2005-08-18     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1653-9     Citation Subset:  IM    
Affiliation:
Israel Naval Medical Institute, POB 8040, Haifa 31080, Israel. emirit@netvision.net.il
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adult
Breath Tests / methods
Carbon Dioxide / analysis,  metabolism*
Diving / physiology*
Humans
Hypercapnia / metabolism
Life Change Events*
Male
Oxygen Consumption / physiology*
Physical Exertion / physiology
Pulmonary Ventilation / physiology*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Superoxide dismutase failed to attenuate allergen-induced nasal congestion in ragweed-sensitized dog...
Next Document:  The process of seeking and undergoing surgical contraception: an ethnographic study in a Brazilian c...