Evaluation of Postural Control in Quiet Standing Using Center of Mass Acceleration: Comparison Among the Young, the Elderly, and People With Stroke Erkang.

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Evaluation of Postural Control in Quiet Standing Using Center of Mass Acceleration: Comparison Among the Young, the Elderly, and People With Stroke Erkang Yu, MD, Masaki Abe, PhD, Kei Masani, PhD, Noritaka Kawashima, PhD, Fumio Eto, MD, PhD, Nobuhiko Haga, MD, PhD, Kimitaka Nakazawa, PhD Archives of Physical Medicine and Rehabilitation Volume 89, Issue 6, Pages 1133-1139 (June 2008) DOI: 10.1016/j.apmr.2007.10.047 Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 (A) Typical 20-second recording from a subject standing quietly in the young group for COP and COM in AP (top) and ML (bottom) directions. (B) Typical 20-second recording from a subject standing quietly in the young group for COM acceleration and COP-COM in AP (top) and ML (bottom) direction, respectively. Note that the positive value indicates forward in the AP and right leaning in the ML and the negative value indicates backward in the AP and left leaning in the ML direction of motion, respectively. Abbreviation: CMA, COM acceleration. Archives of Physical Medicine and Rehabilitation 2008 89, 1133-1139DOI: (10.1016/j.apmr.2007.10.047) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 The results from nonparametric statistical analysis in comparison for all variables for SD of (A) COP-COM and (B) COM acceleration in the AP and ML directions. Abbreviations: E-group, elderly group; S-group, stroke group; Y-group, young group. *P<.05 (between groups); †P<.01 (between groups). Archives of Physical Medicine and Rehabilitation 2008 89, 1133-1139DOI: (10.1016/j.apmr.2007.10.047) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 3 The relationships between COM acceleration and COP-COM in each group and in each direction. The left plots (A) show the relationships in AP direction, and the right plots (B) show those in ML direction. The top plots show the results for young group, the middle plots for elderly group, and the bottom plots for stroke group. The lines in the plots indicate the regression lines. The r values in the plots indicate the Spearman correlation coefficients. Archives of Physical Medicine and Rehabilitation 2008 89, 1133-1139DOI: (10.1016/j.apmr.2007.10.047) Copyright © 2008 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions