A stress test, sometimes called a treadmill
test or exercise test, helps your doctor
find out how well your heart handles its
workload. As your body works harder during
the test, it requires more fuel and your
heart has to pump more blood. The test
can show if there’s a lack of blood supply
through the arteries that go to the heart.
Taking a stress test also helps your doctor
know the kind and level of physical activity
that’s right for you.
Why do people need stress tests?
Doctors use exercise stress tests to find out:
• If you have an irregular heartbeat.
• If your symptoms (such as chest pain or difficulty
breathing) are related to your heart.
• How hard you should exercise when you are joining
a cardiac rehabilitation program or starting an
• If treatments you have received for heart disease are
• If you need other tests (such as a coronary
angiogram) to detect narrowed arteries.
How do I prepare for a stress test?
• Tell your doctor about any medicines (including
over-the-counter, herbs and vitamins) you take. He
or she may ask you not to take them before the test. Don’t stop taking them unless the doctor says to.
• You may be asked not to eat, drink or smoke for two
to four hours before the test. You may drink water.
• Wear comfortable, loose-fitting clothing and walking
shoes with rubber soles. Shorts or sweatpants a and
jogging or tennis shoes are good choices.
What happens during the test?
• You’re hooked up to equipment to monitor
• You walk slowly in place on the treadmill.
• It tilts so you feel like you’re going up a small hill.
• It changes speeds to make you walk faster.
• You may be asked to breathe into a tube for a
couple of minutes.
• You can stop the test at any time if you need to.
• After slowing down for a few minutes, you’ll sit
or lie down and your heart and blood pressure will
What is monitored during the test?
• Your heart rate
• Your breathing
• Your blood pressure
• Your electrocardiogram (ECG or EKG)
• How tired you feel
What equipment is used?
The electrocardiography machine will record your heartbeat and heart waves in an electrocardiogram
• Wires, or electrodes, will be hooked up to your
chest and arms or shoulders. The wires are connected to the ECG machine.
• Near the end, you may breathe into a mouthpiece that
will measure the air you breathe out.