Variability in kinematic coupling assessed by vector coding and continuous relative phase

Abstract Variability in the spatio-temporal coordination of human movement kinematics is often assessed by vector coding and continuous relative phase (CRP). To facilitate appropriate comparisons between the findings of studies that have used different techniques to assess variability, the purposes...

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Bibliographic Details
Published in:Journal of biomechanics 2010-09, Vol.43 (13), p.2554-2560
Main Authors: Miller, Ross H, Chang, Ryan, Baird, Jennifer L, Van Emmerik, Richard E.A, Hamill, Joseph
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Biomechanical Phenomena
Biomechanics. Biorheology
Coding
Continuous relative phase
Coordination
Coupling
Dynamical systems
Fundamental and applied biological sciences. Psychology
Human movement
Humans
Information theory
Joining
Kinematics
Male
Mathematical analysis
Methods
Models, Theoretical
Movement
Observer Variation
Physical Medicine and Rehabilitation
Reproducibility of Results
Studies
System theory
Tissues, organs and organisms biophysics
Variability
Variables
Vector coding
Vectors (mathematics)
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Walking
Walking - physiology
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Summary:Abstract Variability in the spatio-temporal coordination of human movement kinematics is often assessed by vector coding and continuous relative phase (CRP). To facilitate appropriate comparisons between the findings of studies that have used different techniques to assess variability, the purposes of this study were: (1) to determine if both vector coding and CRP behave according to dynamical systems theories on variability and state space transitions; and (2) to determine if trends in coordination variability during movement are consistent when using either vector coding or CRP. We present both a theoretical case (the Lorenz Attractor) and two experimental cases (rearfoot–forefoot coupling during overground walking for 22 subjects; the effect of treadmill speed on thigh-leg coupling for five subjects). In the theoretical case, variability quantified by CRP agreed with dynamical systems theory on state space transitions more so than variability quantified by vector coding. In experimental cases, this distinction was less clear, although CRP appeared to be a more conservative metric for variability. The magnitudes (all p
ISSN:0021-9290
1873-2380
DOI:10.1016/j.jbiomech.2010.05.014