AI Article Synopsis

  • The study compared ground reaction force (GRF) measurements with forces estimated from kinematic data across a range of running speeds (1.94-5.56 m/s).
  • Vertical force parameters, including peak force and impulse, were similar between the kinematic methods and GRF, while metrics like contact time and vertical stiffness showed trends with less than 5% difference.
  • The findings suggest that kinematic data can effectively compute main vertical GRF parameters, offering an alternative method for analyzing running mechanics without the need for specialized equipment like an instrumented treadmill.

Article Abstract

We compared running mechanics parameters determined from ground reaction force (GRF) measurements with estimated forces obtained from double differentiation of kinematic (K) data from motion analysis in a broad spectrum of running speeds (1.94-5.56 m⋅s). Data were collected through a force-instrumented treadmill and compared at different sampling frequencies (900 and 300 Hz for GRF, 300 and 100 Hz for K). Vertical force peak, shape, and impulse were similar between K methods and GRF. Contact time, flight time, and vertical stiffness (k) obtained from K showed the same trend as GRF with differences < 5%, whereas leg stiffness (k) was not correctly computed by kinematics. The results revealed that the main vertical GRF parameters can be computed by the double differentiation of the body center of mass properly calculated by motion analysis. The present model provides an alternative accessible method for determining temporal and kinetic parameters of running without an instrumented treadmill.

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Source
http://dx.doi.org/10.1123/jab.2015-0329DOI Listing

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