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RESEARCH ARTICLES

Effects of Voluntary and Automatic Control of Center of Pressure Sway During Quiet Standing

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Pages 256-264 | Received 20 May 2014, Accepted 04 Oct 2014, Published online: 25 Nov 2014
 

ABSTRACT

The authors investigated the effects of voluntary and automatic control on the spatial variables (envelope area, maximal amplitude, and root mean square [RMS]) of center of pressure (COP) displacement during quiet standing and identified differences in their postural control strategies (mean velocity [MV], mean power frequency [MPF], and power density). COP data were recorded under relaxed (experimental control), still (voluntary control), and dual (automatic control) conditions. RMS was significantly lower in the still and dual conditions than in the relaxed condition. MV, MPF, and power density were significantly higher in the still condition than in the dual condition. These results indicate that both voluntary and automatic control decrease the spatial variables of COP displacement; however, their postural control strategies are different.

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