Document Detail

Effects of sitting position on uterine activity during labor.
MedLine Citation:
PMID:  3796922     Owner:  NLM     Status:  MEDLINE    
To determine which components of uterine activity are affected by different positions of labor, 116 intrauterine pressure records in the sitting and supine positions were analyzed in order to measure resting, contraction, and bearing down pressures. The resting pressure in the sitting position showed consistent elevation compared to the supine position, while the contraction pressure did not differ strikingly in the two positions. The bearing down pressure in the sitting position for nulliparas during the second stage and for multiparas at the time of the 8- to 10-cm dilation was significantly higher than that in the supine position. Also, the sitting position led to a significantly shorter duration of the second stage in nulliparas and the 5- to 10-cm dilation period in multiparas. These findings suggest that the maternal position does not affect uterine contractility, that the increased resting pressure in the sitting position is of some importance in supplementing the downward delivery force, and that the increased bearing down pressure in the sitting position could help to significantly shorten the duration of labor.
S Z Chen; K Aisaka; H Mori; T Kigawa
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  69     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1987 Jan 
Date Detail:
Created Date:  1987-01-29     Completed Date:  1987-01-29     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  67-73     Citation Subset:  AIM; IM    
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MeSH Terms
Labor Stage, Second
Labor, Obstetric*
Time Factors
Uterine Contraction*
Uterus / physiology

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