Effect of calibration technique on the accuracy of Kinovea estimates.

(A) Vertical velocity, (B) horizontal velocity, and (C) angular velocity. Root mean square errors (RMSE) are from comparison between Qualisys ground truth signals and Kinovea estimates from the 90 deg camera angle, and filtering of position data with a 10 Hz cut-off frequency. Data points show mean values, and error bars show ± 1 SE. Statistical comparisons in two left columns are based on mean values. * p≤0.05, ** p≤0.01, *** p≤0.001.