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Task-level regulation enhances global stability of the simplest dynamic walker
Navendu S Patil1,2, Jonathan B Dingwell1, Joseph P Cusumano2
1Department of Kinesiology, Pennsylvania State University, University Park, PA 16802, USA.
Journal of the Royal Society, Interface
|July 18, 2020
Summary
Humans prioritize speed regulation during walking, which significantly enhances stability and the ability to recover from disturbances. This finding offers insights into motor control strategies and fall risk.
Area of Science:
- Biomechanics
- Robotics
- Human Motor Control
Background:
- Human walking involves complex neuromotor control for upright stability.
- Individuals select from various stepping strategies to meet task goals like speed and direction.
- The preference for specific regulation strategies, especially for disturbance rejection, remains unclear.
Purpose of the Study:
- To investigate the link between task-level regulation and global stability in walking.
- To understand why humans prioritize certain stepping regulation strategies over others.
- To explore the functional connection between motor regulation and fall risk.
Main Methods:
- Studied a powered compass walker model on a treadmill.
- Incorporated step-to-step speed and position regulators.
- Analyzed the impact of different regulation strategies on the walker's stability region (basin of attraction).
Main Results:
- Speed regulation significantly enlarged and regularized the stability region compared to position regulation.
- The model demonstrated that speed regulation is more effective in enhancing stability.
- This suggests a reason for the human preference for speed regulation during walking.
Conclusions:
- Speed regulation plays a crucial role in enhancing global stability during treadmill walking.
- Prioritizing speed regulation may be a strategy to improve disturbance rejection.
- This research connects task-level motor regulation to global stability and potentially fall risk.
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