skdh.gait.StepLengthModel1

class skdh.gait.StepLengthModel1

The distance traveled during a step (heel-strike to opposite foot heel-strike). A basic asymmetry measure is also computed as the difference between sequential step lengths of opposite feet.

Methods

predict(*, fs, leg_length, gait, gait_aux)

Predict the gait event-level endpoint

Notes

The step length is computed using the inverted pendulum model from [1] per

\[L_{step} = 2\sqrt{2l_{leg}h-h^2}\]

where \(L_{step}\) is the step length, \(l_{leg}\) is the leg length, and \(h\) is the Center of Mass change in height during a step. Leg length can either be measured, or taken to be \(0.53height\).

References

[1]

W. Zijlstra and A. L. Hof, “Assessment of spatio-temporal gait parameters from trunk accelerations during human walking,” Gait & Posture, vol. 18, no. 2, pp. 1–10, Oct. 2003, doi: 10.1016/S0966-6362(02)00190-X.