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Related Experiment Video

Updated: May 30, 2026

Methods to Quantify Pharmacologically Induced Alterations in Motor Function in Human Incomplete SCI

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Published on: April 18, 2011

Hip- and trunk-muscle activation patterns during perturbed gait.

Justin M Stanek¹, Todd A McLoda, Val J Csiszer

¹School of Kinesiology and Recreation, Illinois State University, Normal, IL, USA.

Journal of Sport Rehabilitation

|August 11, 2011

Summary

Rapid muscle contractions in the kinetic chain, including the rectus femoris (RF) and gluteus maximus (MA), help the body react to unexpected gait perturbations. Faster activation of external obliques (EO) was observed during these events.

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Area of Science:

Biomechanics
Human Movement Science
Sports Medicine

Background:

The kinetic chain's muscle activation patterns are crucial for maintaining stability during unexpected external disturbances.
Understanding these patterns can inform injury prevention strategies.

Purpose of the Study:

To investigate the electromyographic (EMG) activity of the ipsilateral rectus femoris (RF), gluteus maximus (MA), gluteus medius (ME), and contralateral external obliques (EO).
To compare muscle activation during normal gait versus unexpectedly perturbed gait conditions.

Main Methods:

A repeated measures design was employed with 32 physically active college-age participants.
Subjects underwent walking trials on a custom runway with unexpected 30° inversion perturbations.
EMG analysis focused on average, peak, and time to peak activity for the specified muscles.

Main Results:

Significantly increased average and peak EMG activity were observed for the RF, MA, and EO during perturbed gait compared to normal gait.
The external obliques (EO) demonstrated a faster time to peak muscle activation during the perturbed condition.

Conclusions:

The study highlights the role of rapid contractions in key postural muscles within the kinetic chain for responding to unexpected gait perturbations.
These findings contribute to understanding the neuromuscular mechanisms underlying balance control and injury aversion.