Abstract Summary
It can be difficult for young children to remain focused and avoid fidgeting during postural sway tests of 30 s or longer. The purpose of this study was to evaluate the construct and concurrent validity of sway measures recorded for durations less than 30 s. We measured the CoP RMS error of standing children (5-12 years) with and without cerebral palsy. For 30 s recordings, we observed large between-group effects in mediolateral and transverse-plane sway with eyes closed. We also observed large between-group effects in the Romberg Ratio (eyes closed sway / eyes opened sway) of anteroposterior and transverse-plane sway. These results maintained large effects (i.e. construct validity) and strong correlations to the 30 s measurements (i.e. concurrent validity) at durations as short as 15 s.
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