The Science
The rediscovery
The old practices, measured. Each piece sets a text beside a study — what the text prescribed, what the instrument found, and where the two do and do not meet.
The texts made claims you can test. Slow the breath and the mind slows with it. Hum on the exhale and something changes in the head. Draw the senses in the way a tortoise draws in its limbs and the world stops reaching you. For most of a century these were read as poetry, or as doctrine, and then somebody put a respiration belt on a room of undergraduates, or an electrode on a yogi, and found the number the verse had been pointing at the whole time.
I have a bent toward taking two things that appear to have no relationship and laying one over the other. That is what these are: not the vindication of yoga by science, which is a dull genre, but the particular places where an old instruction and a new instrument turn out to be describing the same thing. The verse first. Then the study — who, how many, what was measured, what moved. Where a finding is small, or the sample is twelve people, or the authors themselves say tentative, it says so.
None of it is proof. Most of it is a good reason to keep practicing.
- 01Six Breaths a Minute
A Latin rosary and a Sanskrit mantra, said at their ordinary pace, both slow the breath to almost exactly six a minute. That is the frequency the cardiovascular system resonates at.
- 02The Breath and the Alarm
About a hundred and seventy-five neurons a side wire the pattern of the breath to the state of the mind. Take them out and the breathing is unchanged. The animal just stops being alarmed.
- 03Five Minutes Before You Speak
Sixty-six students, a panel of judges, and two breathing techniques. The ones who breathed did not spike. Neither pattern is in the old texts.
- 04Humming, and the Gas in the Sinuses
Bhrāmarī is named for a bee. Humming on the exhale raises nasal nitric oxide fifteen-fold — and the effect runs out if you keep going.
- 05Why the Nose
Nasal airflow drives a rhythm in the amygdala and hippocampus that mouth breathing does not. The nostrils do alternate. The hemisphere story built on top of that has not replicated.
- 06The Bellows and the Fire
Bhastrikā is named for a blacksmith's bellows and promises heat. Twelve men trained in a modern forced-breathing method were injected with bacterial toxin and mounted a measurably quieter immune response.
- 07Yoga, GABA, and How Fast It Fades
Twelve weeks of yoga and slow breathing raised thalamic GABA in people with major depression. The rise may be short-lived — a trend, not a finding, and an argument for practicing weekly.
- 08The Tortoise and the Electrode
Pratyāhāra says the senses draw in. In 1961 two yogis in samādhi were shown a strong light, touched with a hot glass tube, and given the vibration of a tuning fork, and their alpha rhythm did not break.
Read these alongside the prāṇāyāma pages, which teach the practices these studies measured — and the warning that comes first.