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Treadmill vs. overground walking: different response to physical interaction.

Julieth Ochoa¹, Dagmar Sternad², Neville Hogan^3,4

¹Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts.

Journal of Neurophysiology

|July 14, 2017

Summary

This summary is machine-generated.

Human gait adapts to robotic ankle assistance, with faster adaptation and persistent changes observed during overground walking compared to treadmill walking, indicating neural adaptation in motor control.

Keywords:

adaptation entrainment gait persistence treadmill vs. overground

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Area of Science:

Biomechanics
Robotics
Neuroscience

Background:

Human motor function rehabilitation is crucial, with robotic assistance showing promise for lower extremity therapy.
Understanding unimpaired gait control is vital for developing effective robotic gait therapy.
Locomotor control's sensitivity to mechanical contexts and perturbations requires further investigation.

Purpose of the Study:

To evaluate human gait adaptation to periodic ankle torque pulses from an exoskeletal robot.
To compare gait entrainment and adaptation between treadmill and overground walking conditions.
To determine if adapted motor behavior persists after perturbation removal.

Main Methods:

14 healthy subjects walked on a treadmill and overground wearing an ankle robot.
Subjects received periodic ankle plantar flexion torque pulses near their preferred cadence.
Gait entrainment, synchronization, and post-perturbation persistence were assessed.

Main Results:

Gait entrainment occurred more frequently and rapidly during overground walking.
Entrained gaits synchronized pulses with ankle push-off, assisting propulsion.
Subjects adapted to slower cadences despite assistive pulses, indicating neural adaptation.
Post-perturbation gait period persistence was more prominent during overground walking.

Conclusions:

Human locomotor control response to physical interaction differs between treadmill and overground walking.
Neural adaptation drives gait entrainment and persistence, particularly with prolonged exposure.
Findings inform the design of more effective robot-aided gait rehabilitation strategies.