Document Detail

Sexual and postural differences in cardioventilatory responses during and after breath holding at rest.
MedLine Citation:
PMID:  7198032     Owner:  NLM     Status:  MEDLINE    
Twelve subjects (six men, six women) were studied in resting conditions for simple breath holding (BH) in either the supine or upright position. Ventilation (VT, V, fr) heart rate (fc) and arterial blood pressure (ABP) were recorded or measured in steady state and then transiently during BH and its recovery. Each subject performed seven HB in the supine position and two in the upright position. Several criteria were used for fc data analysis. During BH, in either the supine or upright position, no change in heart rate was observed, but subjects taken individually may exhibit some significant cardiac responses (tachycardia or bradycardia) for all the tests. In contrast, an increase in mean ABP is always observed, with different patterns in males and females. The upright position allows the responses to be greater, more rapid and significant. As a general rule, males have larger and slower responses than females. After BH, there is a ventilatory cost of apnea which is more important in males. However the delay in repayment of the ventilatory deficit observed during BH is very short (about 40 s): ventilatory and cardiac recovery are complete within 120 s. The results support the ideas that, (1) cardiac responses during BH are dependent on pulmonary physical conditions and metabolic levels before BH, (2) cardiac changes during recovery are, at least in great part, due to the concomitant hyperventilation.
P Sébert; J Sanchez
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  47     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1981  
Date Detail:
Created Date:  1982-02-12     Completed Date:  1982-02-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  209-22     Citation Subset:  IM    
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MeSH Terms
Blood Pressure
Heart / physiology*
Heart Rate
Sex Factors

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

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