Belly or chest?
The hand test, and the trial
Diaphragmatic breathing, belly breathing, deep breathing: the advice is everywhere and the evidence is thinner than the advice. Here is how to check which you do, and what the one controlled trial on healthy adults found.
The hand test
Sit or lie down. Put one hand on your belly, just below the ribs, and one on your chest. Breathe normally, without trying to do anything, and notice which hand moves first and which moves more. If the belly hand leads, the diaphragm is doing most of the work. If the chest hand leads and the shoulders lift, the breath is sitting high. Most people do a bit of both, and it changes with posture, stress and what you ate.
Do it before a sit, not during. Once your eyes are closed and the timer is running, watching your hands is the opposite of the practice.
What the trial found
In 2017, researchers at Beijing Normal University took 40 healthy adults and gave half of them 20 training sessions over 8 weeks in diaphragmatic breathing, using a real-time feedback device and slowing them to an average of about 4 breaths a minute. The other half got no training.1
Afterward, the trained group reported less negative affect than at baseline, scored higher on a sustained-attention test relative to the untrained group, and had lower salivary cortisol relative to the untrained group.
The caveats
It is one trial of 40 people. Participants were assigned to groups by alternating the order they signed up, not by a coin flip. The training was intensive and coached, with a device showing them their breathing in real time, and it slowed them far below a normal rate. None of that is "breathe into your belly for a minute." What the trial supports is that weeks of trained slow diaphragmatic breathing changed three measures in healthy adults. It does not show that chest breathing harms you.
Where it fits with the rest
The larger literature on breathwork is a small-to-medium effect on stress across a dozen trials, with the breathing rate the most consistent lever and the exhale a disputed one.2 Belly versus chest is the least studied of the three. The overview is on what your breath says while you sit.
What quiettime reads
Today quiettime reads your breaths per minute and how long each inhale and exhale ran, during the sit, through the front camera. Belly versus chest it does not report; for that, the hand test is still the way. How it reads your breath.
Is chest breathing bad?
The research compares trained slow diaphragmatic breathing with no training. It does not show that ordinary chest breathing harms you. Most people do some of both.
How do I know if I breathe with my belly?
One hand on the belly, one on the chest, breathe normally, and notice which moves first and more. Do it before a sit, not during.
How long does it take to learn belly breathing?
In the one controlled trial, 20 coached sessions over 8 weeks with a feedback device. That is the dose the evidence is about.
Does quiettime tell me if I'm belly breathing?
Not today. It reads breaths per minute and inhale and exhale length during the sit. Belly versus chest is the hand test.
How quiettime reads your breath →
Sources
- Ma X, et al. The effect of diaphragmatic breathing on attention, negative affect and stress in healthy adults. Frontiers in Psychology, 2017 (n=40).
- Fincham GW, et al. Effect of breathwork on stress and mental health: a meta-analysis of randomised-controlled trials. Scientific Reports, 2023 (12 trials, 785 people).