Kinetic adaptation during locomotion on a split-belt treadmill

Area of Science:

• Neuroscience
• Biomechanics
• Motor Control

Background:

• Locomotion adaptation is thought to be driven by feedforward control.
• The internal representation of limb kinetics during split-belt locomotion remains understudied.
• Separate neural processes may control kinetic and kinematic locomotion parameters.

Purpose of the Study:

• To investigate the adaptation of limb kinetics during split-belt locomotion.
• To analyze ground reaction forces (GRFs) and center of pressure (COP) during speed perturbations.
• To determine the underlying neural control mechanisms for kinetic adaptation.

Main Methods:

• Utilized a split-belt treadmill with an integrated force plate.
• Analyzed ground reaction forces (GRFs) and center of pressure (COP) during adaptation.
• Assessed motor aftereffects following speed perturbation removal.

Main Results:

• GRF at initial contact and COP showed gradual changes and motor aftereffects, indicating feedforward control.
• GRF during the single-support period adapted rapidly and lacked motor aftereffects, suggesting feedback control.
• Motor adaptation of GRF and COP followed a dual-rate process (fast and slow adaptation).

Conclusions:

• Locomotion control involves different mechanisms for single- and double-support periods.
• Motor adaptation during split-belt locomotion is mediated by both fast and slow neural processes.
• Findings contribute to understanding the neural control of human locomotion.