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Related Experiment Video

Updated: Jul 6, 2026

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Determining The Electromyographic Fatigue Threshold Following a Single Visit Exercise Test

Published on: July 27, 2015

Fatigue analysis before and after shaker exercise: physiologic tool for exercise design.

Kevin T White¹, Caryn Easterling, Niles Roberts

¹Department of Physical Medicine and Rehabilitation (PMR), Medical College of Wisconsin, Milwaukee, WI, 53226, USA. kevin.white2@va.gov

|March 29, 2008

Summary

This summary is machine-generated.

The Shaker exercise initially fatigues the sternocleidomastoid (SCM) muscle faster than suprahyoid (SHM) and infrahyoid (IHM) muscles. Continued exercise improves SCM fatigue resistance while increasing the fatiguing effort of SHM and IHM.

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Area of Science:

Physiology
Biomechanics
Neuromuscular Function

Background:

The Shaker exercise is used to improve swallowing function.
Previous research indicates the Shaker exercise induces fatigue in upper esophageal sphincter (UES) opening muscles and the sternocleidomastoid (SCM).
The SCM muscle is suggested to fatigue earliest during this exercise.

Purpose of the Study:

To quantify muscle fatigue induced by the isometric portion of the Shaker exercise.
To analyze the rate of change in median frequency (MF rate) of power spectral density (PSD) from surface electromyography (EMG) signals.
To compare fatigue development in suprahyoid (SHM), infrahyoid (IHM), and SCM muscles across different isometric hold durations (20, 40, 60 seconds).

Main Methods:

Surface electromyography (EMG) was used to record muscle activity.
The median frequency (MF) of the power spectral density (PSD) was analyzed to assess muscle fatigue.
Isometric hold durations of 20, 40, and 60 seconds were employed during the Shaker exercise protocol.
Fatigue-related changes were measured by the rate of change in MF (MF rate).

Main Results:

Fatigue-related changes in muscle activity were observed as early as the 20-second isometric hold.
The SCM muscle demonstrated initial and rapid fatigue, comparable to or exceeding that of the SHM and IHM muscles.
Post-exercise, the SCM showed a decreased MF rate, suggesting enhanced fatigue resistance, while SHM and IHM exhibited increased MF rates, indicating greater fatiguing effort.

Conclusions:

The Shaker exercise initially enhances the fatigue resistance of the SCM muscle.
With continued performance, the exercise subsequently increases the fatiguing load on the less fatigue-resistant SHM and IHM muscles.
This differential muscle response suggests a potentiated therapeutic effect of the Shaker exercise regimen through sustained performance.