Concierge cardiology · London
Exercise tolerance testing (ETT), the classic treadmill test — how far can you go, and what does your ECG do at each stage?
ETT is the classic treadmill exercise ECG test — quantifying exercise capacity in METs while monitoring ECG and blood pressure at each Bruce stage. This shorter guide covers what to expect, common protocols and when ETT still adds value.
Why patients choose us
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The right hands
We route you to a consultant cardiologist supervising the treadmill test — the person watching the ECG is the person who decides the answer.
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Often answers same-day
Findings can frequently be discussed immediately after the test, with the written report to follow.
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Independent, and free
We are paid by no clinic, so the recommendation is impartial and costs you nothing.
Key facts
The six things worth knowing about ETT.
What the test is, how long it takes, and where it still adds value in modern cardiology.
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Definition
A Bruce-protocol treadmill test with continuous ECG and blood-pressure monitoring — the classic exercise ECG.
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Duration
Typically 8–15 minutes on the treadmill, per the standard Bruce protocol.
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Symptom-limited endpoint
The test runs until symptoms, fatigue or a pre-defined endpoint — not to an arbitrary time.
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Assesses METs and chronotropic response
Quantifies exercise capacity in METs and the heart-rate response to exercise.
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Adjunct to imaging-based stress tests
Complements — rather than replaces — stress echo, stress MRI and CT coronary angiography.
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Occupational medical clearance
Sometimes used for occupational cardiovascular clearance (aviation, offshore, emergency services).
How the test runs
From consultation to report — what happens, in order.
One consultant cardiologist from first message to report — often within days.
- 01
Cardiology consultation
A consultant cardiologist reviews your history, risk factors and indication for testing.
- 02
Withhold beta-blockers if requested
Beta-blockers are sometimes withheld beforehand — only if your cardiologist explicitly asks.
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Skin prepared and electrodes applied
Skin is lightly abraded and 10–12 ECG electrodes are applied to give a clean tracing during exercise.
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Baseline ECG + BP
A resting 12-lead ECG and baseline blood pressure are recorded before you start walking.
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Bruce protocol treadmill
The treadmill speed and incline increase every three minutes through the standard Bruce stages.
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Continuous monitoring during test and recovery
ECG and BP are recorded continuously through exercise and for several minutes into recovery.
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Consultant cardiology report
A structured cardiology report — METs achieved, Duke Treadmill Score, ECG and BP response, and the concrete next step.
Typical end-to-end: 3–7 days. Urgent cases: same week.
What it shows
What an ETT can — and cannot — settle.
ETT quantifies your exercise capacity and captures the ECG and BP response to graded exercise — a set of prognostic signals rather than a picture of the coronary arteries themselves.
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Exercise capacity in METs
A numerical measure of functional capacity — how much work your cardiovascular system can sustain.
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Duke Treadmill Score
A validated prognostic score combining exercise time, ST-depression and angina during the test.
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Exercise-induced ST-depression
Ischaemic ECG changes appearing at a specific workload — the classic positive finding.
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Exercise-induced arrhythmia
Ventricular ectopy, non-sustained VT or supraventricular arrhythmia provoked by exercise.
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Chronotropic incompetence
An inadequate heart-rate response to exercise — a marker of cardiovascular risk.
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Hypertensive BP response
An exaggerated blood-pressure response to exercise, relevant to overall CV risk.
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Hypotension during exercise
A fall in systolic BP during exercise — a marker of significant coronary disease or LV dysfunction.
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Red flag: sustained VT / VF or chest pain at low workload — terminate and admit
Sustained ventricular arrhythmia or chest pain at a low workload requires immediate termination and hospital admission.
Next steps
What happens after your ETT.
A normal test is powerfully reassuring; an abnormal test triggers a specific onward pathway — imaging, medical therapy, or invasive assessment as indicated.
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Reassurance if normal
A normal test with good exercise capacity is powerfully reassuring in the right clinical context.
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Optimal medical therapy for CAD
Antiplatelet, statin, beta-blocker and antianginal therapy tailored to your risk and symptoms.
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CTCA / stress echo / CMR
Further characterisation with CT coronary angiography, stress echo or cardiac MRI as indicated.
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Invasive coronary angiography
Cardiac catheterisation when the ETT and clinical picture point to significant obstructive coronary disease.
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Cardiac rehabilitation
Structured exercise-based rehabilitation for confirmed coronary disease or post-event care.
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Cardiovascular risk-factor optimisation
Blood pressure, lipids, diabetes and lifestyle — the modifiable levers that change long-term outcome.
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Occupational fitness clearance
A formal report for aviation, offshore, diving or emergency-services occupational medicals.
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Structured cardiology follow-up
Planned follow-up with the reporting cardiologist — not left to chance.
Red flags
When ETT isn’t safe, or the findings can’t wait.
The situations where the test is deferred, terminated, or acted on urgently. These are the ones the supervising cardiologist watches for first.
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Sustained VT / VF
Sustained ventricular tachycardia or fibrillation during the test — immediate termination and emergency management.
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Marked ST-elevation
New marked ST-elevation on exercise ECG — a signal of significant ischaemia, urgent cardiology review.
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Hypotension during exercise
A fall in systolic BP during exercise is a red flag for significant CAD or LV dysfunction.
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Chest pain at low workload
Angina appearing at a low workload predicts more severe coronary disease.
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High Duke Treadmill Score risk
A high-risk Duke Treadmill Score should prompt further imaging or invasive assessment.
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Uncontrolled hypertension
ETT is deferred until blood pressure is controlled — testing on uncontrolled BP is unsafe.
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Recent ACS
Recent acute coronary syndrome requires a specialist decision on when and whether to test.
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Severe aortic stenosis
Severe symptomatic aortic stenosis is a contraindication to standard ETT.
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Reduced LVEF response
Known significantly reduced LVEF changes the balance of risk and benefit — a cardiologist-led decision.
Reading your report
An ETT report can look intimidating. It isn’t.
Whatever the finding, the report keeps to the same four parts.
A quiet reminder
The report is written for your doctor, not for you — and that’s normal.
If you would like us to talk you through it before your follow-up, just ask.
- 01 Header
Indication and risk factors
Your details, the reason for the test, and the cardiovascular risk factors that shape interpretation.
- 02 Technique
Protocol, leads and endpoint
The Bruce protocol stages completed, ECG lead configuration and the reason the test was terminated.
- 03 Findings
METs, ECG, BP and heart-rate response
Exercise capacity in METs, Duke Treadmill Score, ST-segment changes, BP response and chronotropic response.
- 04 Impression
The conclusion: read this first
Positive, negative or non-diagnostic for exercise-induced ischaemia, prognostic risk band, and the concrete next step.
Sources
The guidance that anchors this page.
Reviewed on 2026-07-30. Next scheduled review 2027-07-30.
Recognised by major UK insurers
Cover depends on your policy and clinic; we confirm with your insurer before booking.
Frequently asked
Everything we get asked about ETT.
Quick answers on Bruce protocol, ETT vs exercise ECG stress test, medications and what happens next.
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What is exercise tolerance testing (ETT)?
ETT is the classic Bruce-protocol treadmill exercise ECG test. It quantifies exercise capacity in METs while continuously monitoring the ECG and blood pressure through each stage of the standard Bruce protocol, and into recovery.
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How is ETT different from an exercise ECG stress test?
They are the same underlying test — ETT is the traditional name emphasising exercise tolerance (METs, Bruce stages, chronotropic response), while "exercise ECG stress test" is the same treadmill test framed around ischaemia detection. Our related exercise ECG stress test page covers the ischaemia-detection angle in more depth.
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How long does the test take?
The treadmill portion is typically 8–15 minutes per the Bruce protocol, plus preparation and a recovery period on the couch. Plan for roughly 45–60 minutes in the department end-to-end.
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Should I stop my medications before the test?
Only if your cardiologist explicitly asks. Beta-blockers are sometimes withheld to allow the heart rate to rise, but do not stop any medication without specific instructions.
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When is ETT still the right test in 2026?
ETT still adds value for symptom-limited exercise capacity, occupational cardiovascular clearance, and as an adjunct in selected patients — even in an era dominated by CT coronary angiography and imaging-based stress tests.
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What happens if the test is abnormal?
An abnormal ETT usually leads to further characterisation with CT coronary angiography, stress echo, cardiac MRI or invasive coronary angiography — the choice depends on the pattern and severity of the findings.
Related
Looking for a different test?
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Exercise ECG stress test
The same treadmill test framed around ischaemia detection.
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Cardiopulmonary exercise testing with gas exchange — a more detailed assessment.
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In practice, in London
Getting exercise tolerance testing ett sorted in London, without the guesswork
With exercise tolerance testing ett, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. On the NHS, exercise tolerance testing ett typically sits behind a triage step and a wait that can stretch from a few weeks into months. In London’s private sector, the same appointment often lands within days. That speed matters when symptoms are disrupting work, sleep, or a plan you’d already committed to — and it’s the single most common reason people call us in the first place.
In practice, a private exercise tolerance testing ett appointment in London means a named consultant, a proper hour in the room (or the equivalent on a video call), and a report you can actually read. Most of the imaging suites and endoscopy units we use sit within a mile of Harley Street or in Chelsea and Fulham, and turnaround on findings is measured in days, not weeks. For exercise tolerance testing ett specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
Honesty about expectations is part of the job. A private exercise tolerance testing ett appointment in London won’t change the underlying medicine — the guidelines, the consultants, and the equipment are largely the same as on the NHS. What it changes is speed, continuity, and the amount of time you get to actually talk through the findings. Everyone we route to is GMC-registered and works within CQC-regulated facilities.
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