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Dynamic postural stability during advancing pregnancy.

Authors
McCrory-JL; Chambers-AJ; Daftary-A; Redfern-MS
Source
J Biomech 2010 Aug; 43(12):2434-2439
NIOSHTIC No.
20038101
Abstract
Pregnant women are at an increased risk of experiencing a fall. Numerous anatomical, physiological, and hormonal alterations occur during pregnancy, but the influence of these factors on dynamic postural stability has not been explored. The purpose of this study was to examine dynamic postural stability in pregnant women during their second and third trimesters as well as in a group of non-pregnant control women. METHODS: Eighty-one women (41 pregnant, 40 controls) participated stood on a force plate that translated anteroposteriorly at small, medium, and large magnitudes. Reaction time and center of pressure (COP) movement during the translations were analyzed. Trimester, perturbation direction, and perturbation magnitude were the independent variables in a mixed-model analysis of variance on each of the following dependent variables: reaction time, initial sway, total sway, and sway velocity. RESULTS: Reaction time to the perturbation was not significantly different between the groups. Initial sway, total sway, and sway velocity were significantly less during the third trimester than during the second trimester and when compared to the non-pregnant controls (P<0.05). No differences were found in any of the measures between the pregnant women in their second trimesters and the control group. CONCLUSION: Alterations in sway responses to perturbations are seen in the third trimester in healthy women with uncomplicated pregnancies. Further study is needed to examine the biomechanical and physiological reasons behind this altered dynamic postural stability.
Keywords
Biomechanics; Pregnancy; Women; Posture; Force; Reaction-rates; Body-distribution; Performance-capability; Body-mechanics; Motion-studies; Pressure-testing; Accident-potential; Accident-prevention; Injury-prevention; Author Keywords: Perturbation; Balance; Center of pressure; Trimester
Contact
J.L. McCrory, Division of Exercise Physiology, Department of Human Performance and Applied Exercise Science, West Virginia University, 8315 Health Sciences Center South, PO Box 9227, Morgantown, WV 26506-9227, USA
CODEN
JBMCB5
Publication Date
20100826
Document Type
Journal Article
Email Address
jmccrory@hsc.wvu.edu
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-008548
Issue of Publication
12
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
WV; PA
Performing Organization
University of Pittsburgh
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