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The purpose of this study was to evaluate the intra-session reliability of traditional and nonlinear time-series center of pressure (CoP) based measures of postural sway during upright semi-tandem quiet stance in young vs. older subjects. Seventy-four healthy volunteers (40 young individuals, mean age: 27±6yrs; 34 older individuals, mean age: 79±8yrs) performed three 30-s trials of semi-tandem quiet...
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