Is it safe to exercise after a heart attack?

What does the evidence show?

Cochrane reviews of exercise-based cardiac rehabilitation in coronary heart disease report reductions in cardiovascular mortality and in hospital admissions, along with improvements in quality of life. The effect is consistent enough that cardiac rehabilitation appears in prevention guidelines as a recommended part of care after a coronary event.

The uptake, however, is far lower than the recommendation. Many patients are never referred, and many who are referred never start — which is the real reason the treatment underperforms in practice.

What does a supervised session involve?

An assessment first: exercise capacity measured rather than estimated, blood pressure and rhythm response, symptoms, and the medication list. Then aerobic work at a prescribed intensity with monitoring, resistance training added once tolerance is established, and education about symptoms, medication and risk factors.

The prescription is a number — a heart rate range, a workload, a perceived exertion target — and it is revised on repeat measurement rather than on how the sessions felt.

Which symptoms mean stop?

Chest pain or tightness, unusual breathlessness for the workload, dizziness, palpitations that do not settle, or cold sweating. These are taught before the first session rather than discovered during it, and a supervised programme has a plan for each.

Muscle fatigue and being out of breath in proportion to the effort are expected. Learning to tell the two apart is part of what the programme delivers, and it is what makes independent exercise safe afterwards.

What happens after the programme ends?

The benefits reverse when the exercise stops, so a programme that ends without a sustainable plan has bought a few months. Discharge should include a written home or gym prescription, the measurements from the first and last assessment, and a named review point.

For patients who travel for an intensive block, the handover to a local service or a supervised home programme is the part to arrange before arrival rather than in the final week.

Frequently asked questions