Table 11.

Parameters/features extracted from the GaitShoe sensors data.

Sensor	Parameters/Features	Sensor Output
Accelerometer	Stride length and stride velocity, and other velocities and displacements	Voltage change corresponding to acceleration: single integration of acceleration yields velocity, double integration yields distance (integration done after correcting for gravitational component)
Gyroscope	Orientation	Voltage change corresponding to angular velocity: single integration yields angle of rotation
Force sensitive resistors	Force distribution under foot and heel strike timing, toe-off timing	Resistance change corresponding to applied force across the sensor, resulting from change in compression of the sensor
Polyvinylidene fluoride stripe	Heel strike timing and toe-off timing	Voltage change corresponding to dynamic pressure across the sensor
Bend sensor	Planthar flexion/dorsi-flexion, flexion at metatarsals	Resistance change corresponding to flexion angle, resulting from strain on the sensor
Electric field sensor	Height of foot above floor	Capacitance corresponding to distance