How does exercise help breathlessness in COPD?

Why does COPD cause breathlessness?

Chronic obstructive pulmonary disease (COPD) narrows the airways and damages the air sacs, making it harder to breathe out fully. Air becomes trapped in the lungs, and the breathing muscles work harder. During activity, breathing rate rises and trapped air increases, causing breathlessness.

Many people with COPD reduce activity to avoid breathlessness. Over time, leg and arm muscles weaken and become less efficient, so even light tasks cause breathlessness. This is known as the cycle of inactivity.

How does exercise break the cycle?

Regular exercise improves the ability of muscles to use oxygen, so they produce less lactic acid and the body needs less ventilation for the same task. Stronger muscles, better coordination and increased confidence also reduce the sensation of breathlessness.

An official statement from the American Thoracic Society and European Respiratory Society describes pulmonary rehabilitation as a core component of managing chronic respiratory disease, combining exercise training, education and behaviour change 2.

What does the evidence show?

A Cochrane review of 65 randomised trials with 3,822 people with COPD found that pulmonary rehabilitation improved breathlessness, fatigue, emotional function and sense of control on the Chronic Respiratory Questionnaire by more than the minimal clinically important difference 1. For breathlessness, the improvement was 0.79 units 1.

Six-minute walk distance improved by an average of 43.9 metres compared with usual care, across 38 studies with 1,879 participants, which exceeds the threshold for clinical significance 1. Most programmes lasted eight or twelve weeks.

What does pulmonary rehabilitation involve?

Programmes usually include walking or cycling exercise, strength training for the arms and legs, education about COPD, inhaler technique, breathing control, managing flare-ups, nutrition, and psychological support. Sessions are typically held two or more times a week with a home exercise plan.

The global COPD strategy recommends pulmonary rehabilitation for people with a high symptom burden and those at risk of exacerbations, including after a hospital admission for a flare-up 3.

Is it safe to feel breathless during exercise?

Some breathlessness during exercise is expected and not harmful. Programmes teach people to work at a level where they are moderately breathless, often using a breathlessness scale, and to recover with breathing control.

Using a reliever inhaler before exercise if prescribed, pacing, and pursed-lip breathing can make exercise more comfortable. People who use oxygen may exercise with it as advised.

How can benefits be maintained?

Benefits of pulmonary rehabilitation gradually decline if exercise stops. Continuing regular walking, strength exercises and community exercise classes helps maintain improvements.

Repeating a rehabilitation programme may be recommended after a decline in function or a hospital admission.

What if I feel too breathless to take part in a programme?

Many people worry that they are too breathless or unwell to benefit, but pulmonary rehabilitation is designed for people who are limited by breathlessness. Exercise is started at a level each person can manage, and staff teach breathing control and recovery positions so that breathlessness feels more manageable.

If attending a group is difficult because of transport, anxiety or other health problems, ask whether home-based or remotely supported programmes are available. Starting with short periods of activity at home, such as seated exercises or brief walks, can build enough confidence to join a programme later.

When should breathlessness be checked urgently?

Seek urgent help for severe breathlessness at rest, blue lips, chest pain, confusion or drowsiness.

Contact your clinician if breathlessness, cough or sputum worsens over a few days, as this may indicate a flare-up that needs treatment.

Frequently asked questions