Document Detail

Respiratory responses to exercise in divers at 0.4 MPa ambient air pressure.
MedLine Citation:
PMID:  9826080     Owner:  NLM     Status:  MEDLINE    
OBJECT: This study was carried out to evaluate changes in the breathing pattern of divers during exercise at an elevated ambient air pressure equivalent to a depth of 30 m of seawater. METHODS: A total of 22 healthy male subjects performed graded bicycle exercise in a dry hyperbaric chamber up to a maximum of 3.5 W kg(-1) body weight at normal (0.1 MPa) and at elevated ambient air pressure (0.4 MPa). The exercise ventilation (VE), tidal volume (VT), breathing frequency (BF), oxygen uptake (VO2), carbon dioxide elimination (VCO2), and heart rate (HR) were measured. Perceived dyspnea was assessed by Borg scale ratings. RESULTS: Comparison of respiratory indices between conditions (0.1 versus 0.4 MPa) revealed a significant reduction in VE, VT, BF, and HR during exercise at 0.4 MPa. VO2 and VCO2 did not differ significantly between conditions. Likewise, no significant difference between conditions emerged in perceived dyspnea. CONCLUSION: Ventilation is significantly impaired during heavy bicycle exercise at 0.4 MPa. This is obviously not apparent with regard to subjective perception of dyspnea.
K Tetzlaff; B Neubauer; C Buslaps; B Rummel; E Bettinghausen
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International archives of occupational and environmental health     Volume:  71     ISSN:  0340-0131     ISO Abbreviation:  Int Arch Occup Environ Health     Publication Date:  1998 Oct 
Date Detail:
Created Date:  1999-01-19     Completed Date:  1999-01-19     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7512134     Medline TA:  Int Arch Occup Environ Health     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  472-8     Citation Subset:  IM; S    
Schiffahrtmedizinisches Institut der Marine, Kronshagen, Germany.
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MeSH Terms
Air Pressure*
Body Weight
Diving / physiology*
Dyspnea / etiology,  physiopathology*
Exercise Test
Exercise Tolerance / physiology*
Heart Rate / physiology
Linear Models
Middle Aged
Oxygen Consumption / physiology
Tidal Volume

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