Vernier Software and Technology
Vernier Software & Technology

Introduction to EMG

Figure from experiment 13 from Human Physiology with Vernier


An electromyogram, or EMG, is a graphical recording of electrical activity within muscles. Activation of muscles by nerves results in changes in ion flow across cell membranes, which generates electrical activity. This can be measured using surface electrodes placed on the skin over the muscle of interest.

Electrical activity correlates with strength of muscle contraction, and is dependent on the quantity of nerve impulses which are sent to the muscle. This is easily visible in large muscles such as the biceps muscle in the arm and the quadriceps muscle in the leg, but can also be demonstrated in smaller, less visible muscles, such as the masseter muscle in the jaw.


In this experiment, you will

  • Obtain graphical representation of the electrical activity of a muscle.
  • Associate amount of electrical activity with strength of muscle contraction.
  • Compare masseter muscle function during different types of chewing activity.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Human Physiology with Vernier »

Experiment 13 from Human Physiology with Vernier Lab Book

<i>Human Physiology with Vernier</i> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

Buy the Book

Go to top