New Affordable Method for Measuring Angular Variations Caused by High Heels on the Sagittal Plane of Feet Joints during Gait

Gait is influenced by many factors, but one of the most prominent ones is shoe heel height. Optical motion tracking technology is widely used to analyze high-heeled gait, but it normally involves several high-quality cameras and licensed software, so clinics and researchers with low budgets cannot afford them. This article presents a simple, effective technique to measure the rotation angles on the sagittal plane of the ankle (tibiotalar) and toe (metatarsophalangeal) joints when no shoes (0 cm heel) and high-heeled shoes (2, 6 and 10 cm heels) are worn. The foot’s position was determined by a set of equations based on its geometry and video analysis techniques with free software (Tracker). An evaluation of the spatio-temporal variables confirmed observations from previous studies: increasing heel heights reduces gait cycle length and speed but does not change cadence. The range of movement at the tibiotalar joint progressively narrowed from 28° when no heel height was worn to 9° when a 10 cm heel was used, and these reductions ranged from 30° to 5° for metatarsophalangeal joints, respectively. This aligns with other authors’ previous studies, and confirms that the proposed method accurately measures kinematic ankle–foot set changes when wearing high heels.

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Characteristics of spatio-temporal signals acquired by optical motion tracking

IEEE 10th INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING PROCEEDINGS ◽

10.1109/icosp.2010.5656100 ◽

2010 ◽

Cited By ~ 1

Author(s):

Mingyu Chen ◽

Ghassan AlRegib ◽

Biing-Hwang Juang

Keyword(s):

Motion Tracking ◽

Optical Motion ◽

Spatio Temporal ◽

Optical Motion Tracking

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Monitoring of earthquake induced motions and damage with optical motion tracking

Smart Materials and Structures ◽

10.1088/0964-1726/14/3/005 ◽

2005 ◽

Vol 14 (3) ◽

pp. S32-S38 ◽

Cited By ~ 6

Author(s):

Katsuhisa Kanda ◽

Yuji Miyamoto ◽

Akihiro Kondo ◽

Makoto Oshio

Keyword(s):

Motion Tracking ◽

Optical Motion ◽

Optical Motion Tracking

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Precision, repeatability and accuracy of Optotrak® optical motion tracking systems

10.31224/osf.io/mcr5x ◽

2016 ◽

Cited By ~ 1

Author(s):

Jill Schmidt ◽

Devin R. Berg

Keyword(s):

Rigid Body ◽

Motion Tracking ◽

Surgical Navigation ◽

Plane Motion ◽

Human Motion ◽

Tracking Systems ◽

Total Displacement ◽

Camera Systems ◽

Optical Motion ◽

Optical Motion Tracking

In the field of biomechanics, optical motion tracking systems are commonly used to record human motion and assist in surgical navigation. Recently, motion tracking systems have been used to track implant and bone motion on a micron-level. The present study evaluated four different Optotrak® motion tracking systems to determine the precision, repeatability and accuracy under static testing conditions. The distance between the camera systems and the rigid body, as well as the tilt angle of the rigid body, did affect the resulting precision, repeatability and accuracy of the camera systems. The precision and repeatability, calculated as the within-trial and between-trial standard deviations, respectively, were less than 30 µm; with some configurations producing precision and repeatability less than 1 µm. The accuracy was less than 0.53% of the total displacement for the in-plane motion and less than 1.56% of the total displacement for the out-of-plane motion.

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A Low-Cost Motion Capture System for Small-Scale Wave Energy Device Tank Testing

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.4041608 ◽

2018 ◽

Vol 141 (3) ◽

Author(s):

Francesco Paparella ◽

Satja Sivcev ◽

Daniel Toal ◽

John V. Ringwood

Keyword(s):

Wave Energy ◽

Motion Tracking ◽

Tracking System ◽

Low Cost ◽

Measurement Unit ◽

Small Scale ◽

Energy Device ◽

Optical Motion ◽

Optical Motion Tracking ◽

Motion Tracking System

The measurement of the motion of a small-scale wave energy device during wave tank tests is important for the evaluation of its response to waves and the assessment of power production. Usually, the motion of a small-scale wave energy converter (WEC) is measured using an optical motion tracking system with high precision and sampling rate. However, the cost for an optical motion tracking system can be considerably high and, therefore, the overall cost for tank testing is increased. This paper proposes a low-cost capture system composed of an inertial measurement unit and ultrasound sensors. The measurements from the ultrasound sensors are combined optimally with the measurements from the inertial measurement unit through an extended Kalman filter (EKF) in order to obtain an accurate estimation of the motion of a WEC.

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