Cardiopulmonary Exercise Test

A cardiopulmonary exercise test measures how your heart, lungs and circulation respond to increasing effort. You exercise on a treadmill or a static bike while your ECG, blood pressure, oxygen levels and breathing are recorded. At Allergy Asthma Foundation it is carried out by an experienced team using current equipment and protocols, with clear information given before, during and after so that you know what to expect at every stage.

This page explains why the procedure is done, how to prepare, what happens on the day, and what recovery and follow-up involve. Your own consultant will go through the details that apply to your situation and answer any questions before you agree to go ahead.

Why it is done

A cardiopulmonary exercise test is usually recommended for one or more of the following reasons:

• Breathlessness where it is unclear whether the heart or the lungs are responsible
• Assessment of exercise capacity before major surgery
• Grading the severity of heart failure or lung disease
• Checking the response to treatment over time
• Guiding a safe, individualised exercise or rehabilitation programme

It is only offered when the expected benefit clearly outweighs the risks, and the decision is always made together with you. If a simpler test or treatment would answer the question or relieve the problem, that is tried first.

How to prepare

• Bring a list of your current medicines and any earlier results for the same test.
• Ask the team whether any medicine needs to be paused beforehand — for some tests, antihistamines or inhalers are held for a short, specified time.
• Wear comfortable, loose clothing.
• Avoid a heavy meal, vigorous exercise and strong coffee in the hour before the test.
• Allow a little extra time; the appointment includes explanation and practice, not only the measurement itself.

What happens on the day

1. ECG stickers and a blood-pressure cuff are attached, and for the full test a mask records your breathing.
2. You start walking or cycling slowly; the effort is increased step by step.
3. You continue until you are too tired to go on, or the team stops the test for a clear reason.
4. There is a cool-down period while monitoring continues.
5. The equipment is removed once your heart rate and blood pressure have settled.

After the procedure

You may feel tired for the rest of the day but can return to normal activity. Wear comfortable clothes and trainers, and bring any inhalers you use.

You will be given written instructions covering activity, wound or puncture-site care where relevant, which medicines to restart and when, and the warning signs that mean you should contact us or attend the emergency department. A follow-up appointment or a phone review is arranged before you leave.

Benefits and risks

The main benefit is a clear answer or effective treatment that changes what happens next — a firm diagnosis, a blocked passage reopened, symptoms brought under control, or a condition safely monitored over time. For most people the procedure is straightforward and complications are uncommon.

No procedure is entirely without risk. The ones to be aware of for this treatment include:

• Temporary breathlessness, leg tiredness and a fast heartbeat during the test
• A drop or excessive rise in blood pressure, which is monitored for
• An irregular heartbeat, usually brief
• Very rarely, a serious cardiac event, which is why the test is fully supervised with resuscitation equipment to hand

The team is trained and equipped to recognise and manage these, and the consent discussion covers how likely each is in your case and what is done to reduce it.

Results and follow-up

The team can give you a general impression on the day; the detailed report, with the exercise and breathing measurements, is sent to your consultant within a few working days. Your consultant explains what the result means in the context of your symptoms and examination, and sets out the next step — reassurance and discharge, a change of treatment, a further test, or a planned review. With your consent a summary is sent to your family doctor so that everyone caring for you is working from the same plan.

Questions patients ask

Do I need a referral?

You can book a consultation directly to discuss whether a cardiopulmonary exercise test is right for you. The procedure itself is arranged by the consultant after that discussion, once you have had time to consider it.

Will it hurt?

Discomfort is kept to a minimum with local anaesthetic, sedation or pain relief as appropriate to the procedure. The team will tell you exactly what you are likely to feel and will stop or pause if you need them to.

How long will I be at the hospital?

Most people are in and out within a few hours; where an overnight stay or a longer recovery is expected, that is explained clearly when the procedure is booked so you can plan around it.

To arrange a cardiopulmonary exercise test at your nearest AAF centre, book a consultation online or request a callback. Please bring a list of your current medicines and any previous test results or discharge summaries.