Document Detail

Effects of human pregnancy and aerobic conditioning on alveolar gas exchange during exercise.
MedLine Citation:
PMID:  16091788     Owner:  NLM     Status:  MEDLINE    
This study examined the effects of aerobic conditioning during the second and third trimesters of human pregnancy on ventilatory responses to graded cycling. Previously sedentary pregnant women were assigned randomly to an exercise group (n = 14) or a nonexercising control group (n = 14). Data were collected at 15-17 weeks, 25-27 weeks and 34-36 weeks of pregnancy. Testing involved 20 W.min-1 increases in work rate to a heart rate of 170 beats.min-1 and (or) volitional fatigue. Breath-by-breath ventilatory and alveolar gas exchange measurements were compared at rest, a standard submaximal .VO2 and peak exercise. Within both groups, resting .V(E), .V(A), and V(T)/T(I) increased significantly with advancing gestation. Peak work rate, O2 pulse (.VO2/HR), .V(E), .V(A) respiratory rate, V(T)/T(I), .VO2, .VCO2, and the ventilatory threshold (T(vent)) were increased after physical conditioning. Chronic maternal exercise has no significant effect on pregnancy-induced changes in ventilation and (or) alveolar gas exchange at rest or during standard submaximal exercise. Training-induced increases in T(vent) and peak oxygen pulse support the efficacy of prenatal fitness programs to improve maternal work capacity.
Sonja E McAuley; Dennis Jensen; Michael J McGrath; Larry A Wolfe
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Canadian journal of physiology and pharmacology     Volume:  83     ISSN:  0008-4212     ISO Abbreviation:  Can. J. Physiol. Pharmacol.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-08-10     Completed Date:  2006-02-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372712     Medline TA:  Can J Physiol Pharmacol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  625-33     Citation Subset:  IM    
School of Physical and Health Education, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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MeSH Terms
Anaerobic Threshold / physiology
Exercise / physiology*
Exercise Test
Heart Rate / physiology
Oxygen Consumption / physiology
Physical Fitness / physiology*
Pregnancy / metabolism*
Pulmonary Alveoli / physiology*
Pulmonary Gas Exchange / physiology*
Respiratory Mechanics / physiology

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

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