Document Detail

Effects of human pregnancy and advancing gestation on respiratory discomfort during exercise.
MedLine Citation:
PMID:  16996321     Owner:  NLM     Status:  MEDLINE    
This study examined the effects of human pregnancy and advancing gestation on the intensity of respiratory discomfort (dyspnea) during cycle exercise. Fourteen pregnant women (PG) performed a progressive cycle ergometer exercise test involving 20 W/min increases in work rate to symptom limitation and/or a heart rate of 170-175 beats/min at 19.7+/-1.2 weeks (ENTRY), 28.2+/-0.3 weeks (TM2) and 36.3+/-0.3 weeks (TM3) gestation. Eight, age-matched, sedentary non-pregnant women (CG) were also studied for comparison purposes. Measurements included dyspnea intensity (Borg scale), minute ventilation (VE), breathing pattern and other cardiorespiratory parameters. At peak exercise, neither pregnancy nor advancing gestation had an effect on dyspnea, VE, breathing pattern, oxygen uptake or work rate (p>0.05). VE was significantly greater (by 11 L/min at 100 W) in the PG at TM3 versus CG (p<0.05) at all submaximal work rates. VE also increased progressively from ENTRY to TM2 and TM3 during submaximal exercise. Dyspnea was not significantly different at any submaximal work rate in the PG at TM3 versus CG or with advancing gestation in the PG. In addition, dyspnea at a standardized exercise VE of 40 L/min was not different at TM3 versus ENTRY or in the PG at TM3 versus CG. Neither pregnancy nor advancing gestation were associated with increased respiratory discomfort during strenuous non-weight bearing cycle ergometer exercise, despite substantial increases in VE and progressive mechanical adaptations of the respiratory system to accommodate the increasing size of the gravid uterus.
Dennis Jensen; Katherine A Webb; Larry A Wolfe; Denis E O'Donnell
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-08-22
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  156     ISSN:  1569-9048     ISO Abbreviation:  Respir Physiol Neurobiol     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-02-16     Completed Date:  2007-05-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  85-93     Citation Subset:  IM    
School of Kinesiology and Health Studies, Clinical Exercise Physiology Laboratory, Physical Education Center, Queen's University, Kingston, Ont. K7L 3N6, Canada.
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MeSH Terms
Analysis of Variance
Body Size
Dyspnea / physiopathology*
Exercise / physiology*
Exercise Test
Matched-Pair Analysis
Pregnancy Complications / physiopathology*
Pregnancy Trimesters / physiology
Pulmonary Ventilation / physiology
Reference Values
Respiratory Mechanics / physiology*
Time Factors
Work of Breathing / physiology*

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

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