Least-action principle in gait

@article{Fan2009LeastactionPI,
  title={Least-action principle in gait},
  author={Y. Z. Fan and M Loan and Y. B. Fan and Z. Y. Li and Donglin Luo},
  journal={EPL (Europhysics Letters)},
  year={2009},
  volume={87},
  pages={58003}
}
We apply the laws of human gait vertical ground reaction force and discover the existence of the phenomenon of least-action principle in gait. Using a capacitive mat transducer system, we obtain the variations of human gait vertical ground reaction force and establish a structure equation for the resultant of such a force. Defining the deviation of vertical force as an action function, we observe from our gait optimization analysis the least-action principle at half of the stride time. We… 
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