Muscle force distribution during forward and backward locomotion.

Area of Science:

• Biomechanics
• Human Movement Analysis
• Neurology

Background:

• Backward walking (BW) is utilized in rehabilitation for orthopedic and neurological conditions.
• BW may enhance balance and motor control beyond forward walking (FW).

Purpose of the Study:

• To investigate if BW is a direct reversal of FW.
• To compare muscle force distribution between BW and FW.

Main Methods:

• Gait analysis using Vicon cameras and Kistler plates.
• Electromyography (EMG) for muscle activity measurement.
• OpenSim software for computing muscle force distribution.

Main Results:

• Minor differences in muscle force curves for gluteus maximus, biceps femoris short head, and tibialis anterior between FW and BW.
• EMG validation was good for rectus femoris, biceps femoris short head, and tibialis posterior in both gaits.
• EMG validation for iliacus was achieved only during BW.

Conclusions:

• Backward walking does not represent a simple reversal of forward walking.
• Muscle force distribution exhibits subtle differences between the two gait patterns.
• EMG validation highlights specific muscle activation patterns unique to BW.