Peroneal muscle activity during different types of walking

Area of Science:

• Biomechanics and Kinesiology
• Neuromuscular Physiology

Background:

• Walking on uneven terrain requires constant balance adjustments, primarily managed by ankle muscles.
• Peroneal muscles are crucial for maintaining balance during frontal plane inclination changes.
• Varying foot placement during walking is a method to enhance peroneal muscle engagement.

Purpose of the Study:

• To investigate the electromyographic (EMG) activity of peroneal muscles during different walking conditions.
• To analyze the impact of varied foot placement on medial incline ramps on muscle activation and gait parameters.

Main Methods:

• Sixteen healthy participants walked on a flat surface (NORM), a medial incline ramp (FULL), and a medial incline ramp with an elevated lateral foot position (LAT).
• EMG signals from key ankle muscles (peroneus longus, peroneus brevis, tibialis anterior, soleus, gastrocnemius) were recorded.
• Kinematic parameters including gait speed, stride length, contact time, and foot position were measured.

Main Results:

• EMG activity of peroneal muscles significantly increased when walking on the medial incline ramp.
• Statistically significant differences in EMG were found in peroneal muscles, tibialis anterior, and gastrocnemius lateralis.
• Medial incline walking altered foot position, contact time, and stride length, but not gait speed.

Conclusions:

• Walking on medial incline ramps effectively enhances peroneal muscle neuromuscular function.
• This type of walking may serve as a beneficial exercise for individuals experiencing weakness in their ankle evertors.