What the breathing research shows

Fincham and colleagues, in Scientific Reports in 2023, pooled 12 randomised controlled trials involving 785 adults. Breathwork significantly reduced self-reported stress against control conditions, with a small to medium effect size. Across 20 trials, anxiety moved the same way. Across 18 trials, depressive symptoms moved the same way. Both findings were statistically significant.

This is not a single small experiment. It is a synthesis of controlled studies across different breathwork protocols and adult populations. The effect sizes are not dramatic, but the direction is clear enough to make breathing practice a sensible low-cost complement to the work clinicians already do.

Balban and colleagues at Stanford ran a randomised controlled trial with around 110 people. Participants practised for five minutes a day for 28 days using one of three breathing protocols, and were compared with a mindfulness meditation group.

Breathwork improved mood more than mindfulness meditation and lowered resting respiratory rate. Both findings were statistically significant, with exhale-focused breathing performing best.

This is the study we care about most because it tests the exact dose Remindful asks for: five minutes, at home, unsupervised. It is not evidence that Remindful treats a condition, but it is encouraging evidence for the format.

Shao and colleagues pooled 31 studies involving 1,133 participants. Slowing the breath to around six breaths a minute produced immediate reductions in systolic blood pressure and heart rate, alongside immediate increases in heart rate variability.

These are immediate physiological effects, not a promise about changing a patient's baseline blood pressure. They do, however, give a clear physiological basis for the core slow-breathing practice in Remindful.

Rueda and colleagues, in a 2020 Cochrane review, pooled nine randomised controlled trials involving 347 participants with mild to severe obstructive sleep apnoea. Compared with sham therapy, myofunctional therapy probably reduced daytime sleepiness and may improve sleep quality.

The earlier Camacho meta-analysis in Sleep reported reductions in apnoea-hypopnoea index of roughly half in adults. For airway professionals, the useful conclusion is that breathing and the airway are properly linked, and that structured oral and oropharyngeal work has a meaningful evidence base.