Validation of a portable force plate for in-field measurements of balance and postural sway
Burnett, Wadena D
Objective: To determine how balance outcomes measured using a portable force platform (FP4, Biometrics Inc) compare to balance measurements from an in-floor mounted force plate (6090-15, Bertec Corp). Methods: Twenty adult volunteers stood on the measurement platform for two trials, 10min apart, to measure bi-pedal medial-lateral and anterior-posterior balance with eyes opened and closed. We measured root mean square, range, and mean velocity of variability of center of pressure from each force plate. Pearson correlation was used to determine relationships between force plate outcomes. Intraclass correlation coefficients (ICC) were used to determine measurement reliability. Differences between eyes open and closed outcomes from each device were determined using t-tests. Results: Correlations between portable and in-floor force plate outcomes ranged from 0.73 to 0.98. ICC values ranged from 0.07 to 0.54. Differences between eyes open and closed outcomes were observed in the anterior-posterior directions on both devices.
Balance, Instrumentation, Force Plate, Validation