GRADED EXERCISE TEST (GXT) - View Video
The Graded Exercise Test is a general screening tool used to evaluate the heart’s response to exercise.
The heart normally contracts regularly due to an orderly spread of electrical activity from an area of specialized heart cells called “pacemaker cells” to the rest of the heart. An electrocardiogram (ECG) represents a surface mapping of the electrical activity of the heart.
There is a normal pattern of changes in the electrical activity of the heart with exercise. With different types of heart disease, there will be
various other patterns of changes in the electrical activity of the heart during the exercise process. For example, the response in the rate and
regularity of a heart’s contractions are affected by some forms of heart disease while, in others, the spread of electrical activity within the heart is affected. The resulting change in the shape of the surface mapping of the electrical activity is recorded on the ECG.
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