Jul 1, 2014

Swing-leg trajectory of running guinea fowl suggests task-level priority of force regulation rather than disturbance rejection

PloS One
Y BlumM A Daley

Abstract

To achieve robust and stable legged locomotion in uneven terrain, animals must effectively coordinate limb swing and stance phases, which involve distinct yet coupled dynamics. Recent theoretical studies have highlighted the critical influence of swing-leg trajectory on stability, disturbance rejection, leg loading and economy of walking and running. Yet, simulations suggest that not all these factors can be simultaneously optimized. A potential trade-off arises between the optimal swing-leg trajectory for disturbance rejection (to maintain steady gait) versus regulation of leg loading (for injury avoidance and economy). Here we investigate how running guinea fowl manage this potential trade-off by comparing experimental data to predictions of hypothesis-based simulations of running over a terrain drop perturbation. We use a simple model to predict swing-leg trajectory and running dynamics. In simulations, we generate optimized swing-leg trajectories based upon specific hypotheses for task-level control priorities. We optimized swing trajectories to achieve i) constant peak force, ii) constant axial impulse, or iii) perfect disturbance rejection (steady gait) in the stance following a terrain drop. We compare simulation predict...Continue Reading

  • References41
  • Citations4

References

  • References41
  • Citations4

Citations

Mentioned in this Paper

Neuro-Oncological Ventral Antigen 2
In Silico
Fluctuation
Galliformes
Running (Physical Activity)
Soleus Muscle Structure
Theoretical Study
Family Numididae
Locomotion
Limb Structure

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