Dynamics of human ankle stiffness: variation with displacement amplitude.

@article{Kearney1982DynamicsOH,
  title={Dynamics of human ankle stiffness: variation with displacement amplitude.},
  author={Robert E. Kearney and Ian W. Hunter},
  journal={Journal of biomechanics},
  year={1982},
  volume={15 10},
  pages={753-6}
}
The left foot of five normal human subjects was rotated in a fixed stochastic pattern about a constant ankle angle and the torques opposing these rotations were measured. The dynamic stiffness transfer functions relating ankle angular position to ankle torque were calculated. Stiffness gain was flat at low frequencies, had a resonant valley at intermediate frequencies, and rose to about 40 dB/decade at high frequencies. The mean ankle torque was held constant and the peak-to-peak amplitude of… CONTINUE READING