Document Detail

Influence of body posture and ear clearing on body buoyancy during diving.
MedLine Citation:
PMID:  15622735     Owner:  NLM     Status:  MEDLINE    
The amount of gas introduced into the gastrointestinal (GI) tract during diving was studied by underwater weighing. The influence of body posture and ear clearing methods was determined. Ten subjects were studied in wet simulated dives to a 30-m depth. Clearing the ears by swallowing and descending head first gave a mean weight reduction (before dive-after dive) of 0.29 kg; descending in the upright position gave a mean weight reduction of 0.16 kg. Swallowing during descent (upright posture) caused a 0.11 kg greater weight reduction than blowing against the clamped nose. The greatest weight reduction (1.34 kg) occurred in a head-first dive (swallowing) with 7 cycles of depth changes between 30 and 25 m. During the ascent the subject experienced considerable abdominal discomfort. It was concluded that swallowing during diving, particularly in the head-down position, may introduce large amounts of gas into the GI tract and that during diving one should try to eliminate ingested gas by belching.
P Brattström; B Lindvall; C E Lundgren; H Ornhagen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Undersea biomedical research     Volume:  2     ISSN:  0093-5387     ISO Abbreviation:  Undersea Biomed Res     Publication Date:  1975 Sep 
Date Detail:
Created Date:  2004-12-29     Completed Date:  2005-01-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0421514     Medline TA:  Undersea Biomed Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  161-6     Citation Subset:  IM    
Laboratory of Aviation and Naval Physiology, Department of Physiology and Medical Physics, University of Lund, Sweden.
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MeSH Terms
Aerophagy / physiopathology
Body Weight*
Deglutition / physiology
Diving / physiology*
Ear, Middle / physiology
Gastric Dilatation / etiology,  physiopathology*
Posture / physiology*
Vital Capacity

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

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