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Related Experiment Videos

Motor patterns for human gait: backward versus forward locomotion

R Grasso1, L Bianchi, F Lacquaniti

  • 1Human Physiology Section, Scientific Institute Santa Lucia, National Research Council, University of Tor Vergata, 00179 Rome, Italy.

Journal of Neurophysiology
|October 17, 1998
PubMed
Summary

Forward and backward walking share conserved kinematic patterns, but exhibit distinct muscle activity. This suggests locomotion control prioritizes maintaining movement templates over muscle synergies.

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Analysis

Background:

  • Locomotion involves complex coordination of body segments and muscle activation.
  • Understanding the differences between forward and backward walking can reveal principles of motor control.

Purpose of the Study:

  • To compare the kinematics and muscle activity during forward (FW) and backward (BW) walking.
  • To investigate the underlying motor control strategies for gait reversal.

Main Methods:

  • Recorded motion, ground reaction forces, and electromyographic (EMG) activity in healthy subjects during FW and BW walking.
  • Analyzed joint angles, segment elevation angles, and muscle synergies using cross-correlation analysis.

Main Results:

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  • Elevation angles showed time-reversed waveforms between FW and BW gait, indicating conserved kinematic templates.
  • Muscle activation patterns and synergies differed significantly between FW and BW walking.
  • Backward walking exhibited higher mean EMG activity, suggesting increased energy expenditure.

Conclusions:

  • Kinematic patterns are largely conserved during gait reversal, while muscle synergies are reorganized.
  • This conservation of kinematic templates may reflect a behavioral goal managed by central nervous system networks.
  • The findings suggest motor control is not solely dictated by biomechanical constraints.