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Presenting joint kinematics of human locomotion using phase plane portraits and Poincaré maps.
- Source :
-
Journal of biomechanics [J Biomech] 1994 Dec; Vol. 27 (12), pp. 1495-9. - Publication Year :
- 1994
-
Abstract
- Additional graphical tools are needed to better visualize the joint kinematics of human locomotion. Standard plots in which the joint displacements are plotted against time or percent gait cycle do not provide sufficient information about the dynamics of the system. In this article, a study based on the two graphical tools of nonlinear dynamics to visualize the steady-state kinematics of human gait is presented. An experimental setup was developed to acquire the necessary data for application of the techniques. Twenty young adults, whose medical histories are free of gait pathology, were tested. Computerized electrogoniometers and foot switches were used to measure the kinematic data of the lower extremities and capture four instants of the gait cycle: heel strike, foot flat, heel off, and toe off. Phase plane portraits of each joint were constructed for the sagittal plane by plotting angular velocity against angular displacement. Poincaré maps were obtained by periodically sampling the joint profiles at toe off and plotting the ith iterate against the (i + 1)th one. Phase plane portraits are useful in monitoring the variations of joint velocity and position on the same graph in a more compact form. Poincaré maps are effective in differentiating steady gait from transient locomotion.
- Subjects :
- Adult
Algorithms
Audiovisual Aids
Electronics, Medical
Female
Foot physiology
Gait physiology
Heel physiology
Humans
Male
Middle Aged
Time Factors
Toes physiology
Walking physiology
Ankle Joint physiology
Computer Graphics
Hip Joint physiology
Knee Joint physiology
Locomotion physiology
Models, Biological
Range of Motion, Articular physiology
Subjects
Details
- Language :
- English
- ISSN :
- 0021-9290
- Volume :
- 27
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Journal of biomechanics
- Publication Type :
- Academic Journal
- Accession number :
- 7528748
- Full Text :
- https://doi.org/10.1016/0021-9290(94)90199-6