Event detection error differences between gait events detected from shank accelerometers and force plates.

The initial estimates were based on peaks and crossings of the filtered shank accelerometer data (rows 1 & 2). The systematic biases were negative indicating that the initial accelerometer-based estimates preceded the GRF-based estimates. Removing the systematic bias reduced absolute error in the final estimates of heel strike and toe off (row 3). SD: standard deviation of the average errors.