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Related Experiment Videos

Does a single control mechanism exist for both forward and backward walking?

van Deursen RW1, Flynn, McCrory

  • 1Center for Locomotion Studies, The Pennsylvania State University, 29 Recreation Building, University Park, PA 16802, USA

Gait & Posture
|April 14, 1999
PubMed
Summary

Forward and backward walking share a common central pattern generator (CPG) mechanism. This study found that only two main features control muscle activation patterns for both walking directions.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Kinesiology

Background:

  • The highly reproducible forward walking (FW) pattern is thought to be generated by a central pattern generator (CPG).
  • Understanding the neural control of locomotion is crucial for rehabilitation and understanding movement disorders.

Purpose of the Study:

  • To quantify differences in muscular activation patterns between FW and backward walking (BW).
  • To determine if common features exist in muscle activation across FW and BW.
  • To test the hypothesis that FW and BW are mediated by the same CPG with minor modifications.

Main Methods:

  • Quantified muscular activation patterns during FW and BW at a constant step frequency.
  • Applied a pattern recognition technique to electromyography (EMG) signals.

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  • Analyzed kinematic data for hip, knee, and ankle joints.

    • Main Results:

    • Kinematically reversed patterns were observed at the hip and ankle joints between FW and BW.
    • A 14.3% phase shift in knee joint movement and a 25% phase shift in muscle activation were noted.
    • Only two main features were required to generate EMG patterns for both FW and BW, suggesting a single spinal control mechanism.

    Conclusions:

    • The findings support the existence of a single spinal central pattern generator (CPG) controlling both FW and BW.
    • The CPG likely requires only minor modifications to produce distinct characteristics of each walking mode.
    • This research provides insights into the neural basis of human locomotion.