TMT (Treadmill Stress Test)
A focused scan for Exercise ECG, Ischaemia, BP response and more.
Overview
Examines Exercise ECG, Ischaemia, BP response, Stamina. Performed at an NABL-accredited Meridian Health centre with a same-day report and a free doctor review.
The full panel
4 areas across 1 groupEvery parameter, grouped by body system — no clicking to expand.
What this scan measures
How your heart behaves under controlled physical stress. You walk on a treadmill whose speed and gradient increase in set stages while a 12-lead ECG, your blood pressure and your symptoms are monitored continuously by a doctor. It measures exercise capacity, ECG changes suggesting the heart muscle is short of blood, the blood-pressure response, and any rhythm disturbance brought on by exertion.
A resting ECG is often normal in coronary disease because a narrowed artery can still supply a resting heart. Making the heart work harder is what reveals the shortfall. TMT is ordered for exertional chest pain or breathlessness, to assess exercise capacity after a cardiac event, and to evaluate exercise-induced palpitations.
Symptoms that lead to this scan
- Chest tightness or pain that comes on with exertion and eases with rest
- Breathlessness disproportionate to the activity
- Palpitations or dizziness during exercise
- Risk-factor assessment before starting an exercise programme
- Follow-up after angioplasty or a heart attack
Understanding your results
A test is reported as positive, negative, equivocal or inconclusive — and 'inconclusive' is common, usually because the target heart rate was not reached. A positive test raises the probability of coronary disease enough to justify further testing, not to confirm it; false positives are well recognised, particularly in women and in people on certain medications. A negative test in someone with typical exertional symptoms does not close the question either. Exercise capacity itself, measured in METs, is one of the more powerful pieces of information the test produces.
Why the preparation matters
Eat only a light meal two to three hours before — a full stomach diverts blood to digestion and makes nausea more likely during exertion — and avoid caffeine and smoking for several hours. Wear proper walking shoes and comfortable clothing, since the test is only valid if you can actually walk to your limit. Ask your cardiologist whether to withhold beta-blockers beforehand: they blunt the heart-rate response and can make the test uninterpretable, but they must never be stopped without medical advice. The test is stopped immediately if you develop chest pain, marked breathlessness or dizziness — say so at once.
Cardiac — safety and who should not be scanned
Full Cardiac guideNone of these tests uses ionising radiation — there is no X-ray dose at all in an ECG, an echocardiogram, a Holter or a treadmill test, and they can be repeated as often as clinically useful. The risk lies somewhere else entirely, and it belongs specifically to the stress tests: pushing the heart hard is how the test works, and in a small number of people that provokes chest pain, a significant rhythm disturbance or a fall in blood pressure. That is exactly why a stress test is performed in a room with a doctor present, continuous monitoring and a defibrillator to hand, why it is stopped the moment a stopping rule is met, and why it is not done at all when the heart is known to be unstable. A resting ECG or echocardiogram carries no such risk.
- Unstable chest pain, or a recent heart attack
- Chest pain that is new, worsening or happening at rest, and a heart attack within the last few days, are reasons not to perform a stress test — the test asks the heart to do the very thing that is already failing. Resting tests are safe and are usually what is done instead. Stress testing after an infarct happens later, on a defined protocol, once the picture is stable. The same applies to acute inflammation of the heart muscle or its lining, and to any acutely unwell patient.
- Uncontrolled arrhythmia, or severe aortic stenosis
- A rhythm disturbance that is not controlled, and a severely narrowed aortic valve causing symptoms, both make exercise testing hazardous, because exercise is what tips each of them over. An echocardiogram is done first in anyone with a known or suspected valve problem, precisely so this is known before a treadmill is considered.
- Blood pressure that is very high on the day
- Exercise raises blood pressure further, so it is measured before the test starts and a treadmill test is deferred when the reading is well above target — departments commonly use a threshold in the region of 200 systolic or 110 diastolic. This is a postponement, not a cancellation: the test is rebooked once the pressure is controlled.
- Being unable to walk on a treadmill
- Arthritis, a previous stroke, peripheral arterial disease, severe breathlessness at rest or any mobility limitation makes a treadmill test either unsafe or uninterpretable, because the heart never reaches the workload the test depends on. There is a well-established alternative — a pharmacological stress test, where a drug is given into a vein to make the heart behave as if it were exercising. Say what you can and cannot manage when you book, so the right test is arranged first time.
- Asthma or wheezy lung disease, if a vasodilator drug is planned
- Adenosine and dipyridamole, the drugs used for vasodilator stress testing, can trigger severe bronchospasm in people with asthma or other bronchospastic lung disease, and they are avoided in that situation. Dobutamine, which works differently, is generally used instead. Tell the team about any wheeze, inhaler use or lung disease before the test is booked, not on arrival.
- Caffeine and certain medicines before a pharmacological stress test
- Caffeine directly blocks the drugs used for vasodilator stress, so a scan can be wasted by a single cup of coffee. Avoid coffee, tea, cola, energy drinks, chocolate and decaffeinated coffee for 12 to 24 hours beforehand as instructed, and mention any theophylline-based tablet or inhaler. Which of your regular heart medicines to take or hold on the morning of a stress test — beta blockers especially, since they blunt the heart-rate response and can make the test uninterpretable — is decided by the doctor who requested it, never on your own.
- Practicalities for a 24-hour Holter
- The recorder and its electrodes must stay dry, so you cannot shower or bathe while wearing it. Tell the team about any adhesive or skin allergy, and keep the symptom diary honestly and by the clock — the report's most valuable line is whether what you felt matched what the trace was doing at that minute.
Who should consider this scan
- Adults with exertional chest pain or breathlessness
- People with cardiac risk factors before starting intense exercise
- Patients after angioplasty, bypass or a heart attack, as advised
- Anyone with exercise-induced palpitations
- Not suitable for anyone unable to walk on a treadmill — pharmacological stress testing is used instead
Conditions it helps detect
How it works
Patient stories
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