Document Detail


Acute effects of a single open sea air dive and post-dive posture on cardiac output and pulmonary gas exchange in recreational divers.
MedLine Citation:
PMID:  15849277     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To evaluate the cardiopulmonary effects of open sea scuba air diving to 39 m (30 minutes bottom time) with standard decompression. To account for possible gravity dependent effects of venous gas bubbles, the variables were measured in different post-dive body postures and compared with the baseline values before the dive in the same posture. METHODS: Eight male divers conducted two similar dives on successive days. Their posture before and after the dive was either sitting or supine, in random order. The divers were evaluated before and 30, 60, and 90 minutes after the dive. Venous bubbles were detected by precordial Doppler after the dive in four divers in the supine posture and two divers in the sitting posture. RESULTS: Arterialised oxygen tension had decreased at all times after the dive (-11.3 mm Hg, p = 0.00006), due to decreased alveolar oxygen tension, irrespective of posture. Apart from an increase in the sitting posture 30 minutes after the dive, pulmonary capacity for carbon monoxide diffusion and cardiac index decreased, mostly 60 minutes after the dive (-9%, p = 0.0003 and -20%, p = 0.0002 respectively). The decrease in cardiac index was greater in the supine posture (p = 0.0004), and the physiological dead space/tidal volume ratio increased more in the sitting position (p = 0.006). CONCLUSIONS: Field dives are associated with moderate impairments in cardiac output and gas exchange. Some of these impairments appear to depend on the posture of the diver after the dive.
Authors:
Z Dujic; D Bakovic; I Marinovic-Terzic; D Eterovic
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British journal of sports medicine     Volume:  39     ISSN:  1473-0480     ISO Abbreviation:  Br J Sports Med     Publication Date:  2005 May 
Date Detail:
Created Date:  2005-04-25     Completed Date:  2005-06-17     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0432520     Medline TA:  Br J Sports Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  e24     Citation Subset:  IM    
Affiliation:
School of Medicine, University of Split, Soltanska 2, Split 21000, Croatia. zdujic@bsb.mefst.hr
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Gas Analysis / methods
Cardiac Output / physiology*
Diving / physiology*
Humans
Male
Oceans and Seas
Oxygen Consumption / physiology
Posture / physiology*
Pulmonary Gas Exchange / physiology*
Respiratory Function Tests
Tidal Volume / physiology
Ultrasonography, Doppler / methods
Comments/Corrections

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


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