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A stress ECG, also known as an exercise ECG, treadmill test or exercise stress test, assesses how the heart responds while the body is physically active. The test records the heart’s electrical activity as the intensity of exercise gradually increases, providing information that may not be visible during a resting ECG.
At Hout Bay Family Medical Centre, stress ECG testing forms part of our comprehensive heart and ECG services. Our dedicated procedure rooms are equipped for both resting and stress ECGs, allowing patients to access convenient heart health assessments at our family medical practice in Hout Bay, Cape Town.
During physical activity, the heart needs to work harder and pump more blood and oxygen around the body. A stress ECG allows a doctor to observe the heart’s rate, rhythm and electrical activity while this demand gradually increases.
The test is generally performed while the patient walks on a treadmill or uses a stationary exercise bicycle. Small electrodes attached to the chest continuously record the heart’s electrical signals, while the patient’s heart rate, blood pressure and symptoms are monitored throughout the test.
Unlike a resting ECG, which records the heart while the patient is lying still, a stress ECG may help reveal exercise-related changes that are only noticeable when the heart is working harder.
A doctor may recommend a stress ECG to investigate symptoms that appear or become worse during physical activity. These may include:
The test may also be used as part of a broader cardiac assessment for patients with certain risk factors, an existing heart condition or concerns about how safely they can exercise.
A stress ECG can provide useful information about how the heart functions under physical strain. It may help identify changes in heart rhythm, blood pressure or electrical activity that require further investigation.
Before exercise begins, electrodes are placed on the chest and connected to an ECG machine. A resting ECG and blood pressure reading may first be taken to provide a baseline for comparison.
You will then begin walking on a treadmill or exercising on a stationary bicycle. The speed, incline or resistance is gradually increased in stages so that your heart works progressively harder.
Throughout the stress ECG, your heart rate, heart rhythm, blood pressure and general response to exercise are closely monitored. You should tell the supervising healthcare professional immediately if you experience chest discomfort, unusual shortness of breath, dizziness, weakness or any other concerning symptoms.
The exercise portion of the test may end when:
After exercising, your ECG and blood pressure may continue to be monitored for a short period while your heart rate gradually returns towards its resting level.
Patients are generally advised to wear comfortable clothing and suitable walking or exercise shoes. You may also be asked to avoid a heavy meal or caffeine for a period before the appointment.
Bring a list of any prescription medication, over-the-counter medicine or supplements you are taking. Some medication can affect heart rate or the results of a stress ECG, but you should not stop taking prescribed medicine unless your doctor specifically instructs you to do so.
Your doctor will advise you about any preparation that applies to your individual health, medication and reason for having the test.
The results of a stress ECG are interpreted together with your symptoms, medical history, physical examination, exercise capacity, blood pressure response and any previous test results.
A normal result generally means that no concerning changes were identified during the level of exercise achieved. However, no single test can exclude every possible heart condition.
An abnormal stress ECG does not automatically confirm that a serious heart problem is present. Certain changes may require further investigation, which could include additional monitoring, blood tests, heart imaging or referral to a cardiologist.
Your doctor will explain what the findings mean in the context of your overall health and recommend the most appropriate next steps.
Exercise stress tests are generally considered safe when performed in an appropriate medical setting with professional monitoring. Exercise can occasionally cause symptoms such as dizziness, chest discomfort or an abnormal heart rhythm. Serious complications are rare.
A stress ECG is not suitable for every patient. Before recommending the test, your doctor will consider your symptoms, medical history, current health and ability to exercise. Alternative investigations or specialist assessment may be more appropriate in some circumstances.
Hout Bay Family Medical Centre offers stress ECG testing as part of our professional GP, heart health and preventative healthcare services. Our doctors provide careful assessment before the procedure, monitor patients throughout the test and explain the results in a clear and understandable way.
Patients looking for a trusted doctor in Hout Bay can access stress ECG testing and personalised medical care at our established family medical practice at 19 Brighton Street in Hout Bay, Cape Town.
