Stress index

A stress index measurement evaluates the body’s physiological response to stress based on heart rate patterns. During a stress test, a provider may assess vital signs like heart rate, heart rhythm, and blood pressure.

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Typically, a stress test is done while someone is engaging is some form of exercise, such as an incline walk on a treadmill. During this exercise, they will monitor your heart rate to understand how your heart rate changes and your body responds to stress. Your target and maximum heart rate will depend largely on your age.

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A stress index value can be helpful in understanding your exercise tolerance. Additionally, it can also be indicative of other heart problems. For example, abnormal stress test results could indicate abnormal blood flow, which would warrant further testing.