Breathing Trainer Devices and Resistance Breathers: Uses, Evidence and Cautions

What they are

Inspiratory muscle training (IMT) means breathing in against a set resistance, usually through a hand-held device, to exercise the muscles used to inhale. Some studies of respiratory muscle training also test breathing out. [1] Researchers often measure the result as maximal inspiratory pressure (MIP or PImax), which is a measure of breathing-muscle strength. It is not the same as feeling better or living longer.

How it is proposed to work

The idea is that stronger or more enduring breathing muscles may reduce the effort of breathing. That is a proposal. A Cochrane review notes that clinical trials used many different protocols, devices and measurements, and that it remains unclear how clinically useful IMT is. [2]

What research shows

Training protocols and devices vary a lot between trials. People know when they are training, which can shape self-reported breathlessness.

1. COPD, added to pulmonary rehabilitation

   Unclear

   A Cochrane review included 55 randomized trials; only 8 were at low risk of bias. In 22 trials (1,446 people) adding IMT to rehabilitation gave no improvement in breathlessness or quality of life that met the review's thresholds. [2]

   Mixed

2. COPD, IMT alone versus sham or no training

   Unclear

   The same review found possible improvements in breathlessness and walking distance, mostly very low to moderate certainty. [2]

   Promising but limited

3. Asthma, adults

   Unclear

   A review of 11 studies (270 people) found higher maximal inspiratory pressure but no change in lung function or exercise capacity overall. [1]

   Promising but limited (muscle strength only)

4. After heart bypass surgery

   Unclear

   A review of 15 trials found longer walking distance, plus a shorter hospital stay in the early phase, with evidence quality very low to moderate and no adverse events reported. [3]

   Promising but limited

5. Healthy, active adults

   Unclear

   One review of 11 studies using a single commercial device found higher inspiratory pressure and better sport performance. [4] A 2026 review of 8 studies (203 people) found thicker diaphragm muscle. [5] Thicker muscle is a physical finding, not a health outcome.

   Promising but limited (physiological)

6. Reducing heart disease risk or "improving lung capacity" in healthy people

   Unclear

   Proper evidence not found. The review abstracts we read did not report long-term health outcomes in healthy people.

   Insufficient evidence

In plain terms: these devices reliably strengthen the breathing muscles in many studies. Whether that helps people feel or function better varies by condition and is least clear when added to a full rehabilitation program.

Who supervises, and what to look for

In the sources we read, IMT is delivered in research and rehabilitation settings. We did not find a regulator page on who may teach it outside clinics, so training and oversight for non-clinical teachers is not described in the sources we read. We do not list clinicians or sellers. When choosing, ask:

• Does the device have an adjustable, measured load, and who sets it? Your clinician should set the starting level, not marketing copy.
• Is it intended for a medical purpose, and does the maker promise cures? Avoid cure claims.
• Can you clean it properly, and does it need replacement parts?
• Does the seller claim to treat asthma, sleep apnea or anxiety? Those claims need evidence, and none of the reviews above support them as stand-alone treatment.

We give no prices, because the sources we read do not state any.

Related reading

Breathing exercises for COPD, breathing exercises for asthma, breathing practices with lung conditions and breathing practices with heart conditions.