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Pregnancy-related changes in centre of pressure during gait

Bertuit J., Leyh C., Rooze M., Feipel F.

Acta of Bioengineering and Biomechanics

2017

Vol. 19, no. 4

95--102

Physical and hormonal modifications occuring during the pregnancy, can lead to an increase in postural instability and to a higher risk of falls during gait. The first objective was to describe the center of pressure (COP) during late pregnancy at different gait velocity. Comparison of nulliparous women with postpartum women were conducted in order to investigate the effects of pregnancy. The second objective was to analyse COP variability between pregnant and non-pregnant women in order to investigate the effects of regnancy on gait variability. Methods: Fifty-eight pregnant women in the last four months of pregnancy, nine postpartum women and twenty-three healthy non-pregnant women performed gait trials at three different speeds: preferred, slow and fast. Results: In the last four months of pregnancy gait velocity decreased. During the pregnancy, gait velocity decreased by 22%, stopover time increased by 6–12%, COP excursion XY decreased by 5% and COP velocity decreased by 16% and 20% along the anteroposterior and transverse axes, respectively. After delivery, gait velocity increased by 3% but remained a lower compared to non-pregnant women (–12%). Intra-individual variability was greater for non-pregnant than pregnant women. Conclusions: COP parameters were influenced by pregnancy. This suggests that pregnant women establish very specific and individual strategies with the aim of maintaining stability during gait.

Postural stability in patients with back pain

Kuczyński M., Paluch P.

Acta of Bioengineering and Biomechanics

1999

Vol. 1, nr 2

19-23

30 patients with back pain were subjected to stabilographic investigations in order to disclose possible loss in their postural stability system (PSS). Basing on traditional parameters we can discriminate only the most acute group with 'unbearable' pain from other patients. On the other hand, the autoregressive (AR) approach allowed us to find meaningful differences also between patients with moderate level of pain and the control group. The results indicate that AR modelling produces the opportunity to evaluate physiological and biomechanical parameters characterising the operation of the neuro-muscular system (NMS) responsible for human balance. Those parameters are much more sensitive to the level of mal-function of the stability system, presenting more accurate and differentiated picture of individual cases. It confirms the power of AR-based reasoning and gives new insight into the operation of the PSS.