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Updated: Jun 12, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Dynamic postural stability during advancing pregnancy.

J L McCrory1, A J Chambers, A Daftary

  • 1Division 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. jmccrory@hsc.wvu.edu

Journal of Biomechanics
|June 12, 2010
PubMed
Summary
This summary is machine-generated.

Pregnant women show altered dynamic postural stability in their third trimester, with reduced sway responses compared to the second trimester and non-pregnant controls. This finding highlights changes in balance during late pregnancy.

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Area of Science:

  • Biomechanical analysis of human movement
  • Physiological adaptations during pregnancy

Background:

  • Pregnant women face increased fall risk due to anatomical, physiological, and hormonal changes.
  • The impact of these pregnancy-related alterations on dynamic postural stability remains under-explored.

Purpose of the Study:

  • To investigate dynamic postural stability in pregnant women during their second and third trimesters.
  • To compare stability measures between pregnant women and a non-pregnant control group.

Main Methods:

  • Eighty-one women (41 pregnant, 40 controls) stood on a force plate subjected to anteroposterior translations.
  • Analysis included reaction time and center of pressure (COP) movement.
  • Mixed-model ANOVA examined effects of trimester, perturbation direction, and magnitude on sway parameters.

Main Results:

  • No significant difference in reaction time between groups.
  • Third-trimester pregnant women exhibited significantly less initial sway, total sway, and sway velocity compared to second-trimester and control groups (P<0.05).
  • No significant differences were observed between second-trimester pregnant women and controls.

Conclusions:

  • Healthy, uncomplicated pregnancies are associated with altered sway responses in the third trimester.
  • Further research is required to elucidate the biomechanical and physiological underpinnings of this modified dynamic postural stability.