05955667 is referenced by 403 patents and cites 8 patents.

A device comprised of at least a pair of accelerometers and a tilt sensor mounted in fixed relation to a datum defining plane (sole of a shoe) maybe used for extracting kinematic variables including linear and rotational acceleration, velocity and position. These variables may be resolved into a selected direction thereby permitting both relative and absolute kinematic quantities to be determined. The acceleration is determined using a small cluster of two mutually perpendicular accelerometers mounted on a shoe. Angular orientation of the foot may be determined by double integration of the foot's angular acceleration (which requires a third accelerometer substantially parallel to one of the two orthogonal accelerometers). The two orthogonal accelerations are then resolved into a net horizontal acceleration or other selected direction which may be integrated to find the foot velocity in the selected direction. The average of the foot velocity corresponds to the subject's gait speed.

Title
Motion analysis system
Application Number
8/949472
Publication Number
5955667
Application Date
October 14, 1997
Publication Date
September 21, 1999
Inventor
Kenneth Richard Fyfe
Fort Saskatchewan
CA
Agent
C A Rowley
Assignee
Governors of the University of Alberta
CA
IPC
G01P 15/08
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