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If we consider modern people, it is easy to notice that up to
70% - 80% of modern people breathe using the upper chest.
You can see it while people're seating or when people speak,
you can also observe it during nights. Medical research
studies written many decades ago are going to testify that
people indeed had predominantly diaphragmatic breathing at rest.
Now what are the reasons? In the past, people used
to breathe much less air: 80 or 100 years ago, breathing was very different.
It is also easy to observe in movies that
people virtually never had chest breathing in the past: about
4-5 liters per minute only. Modern people breathe about 12
liters per minute which is the typical number for so called
"normal subjects", and in the sick people this number is even greater.
So, when people breathe more air, they cannot
improve oxygenation of the blood: because during normal
breathing the oxygenation of the blood is about 98-99%.
So, heavy breathing, or deep breathing, or hyperventilation
cannot provide more oxygen for the blood and, therefore, the
one is effect is reduction of carbon dioxide. And that
constricts our blood vessels, suppresses the Bohr effect,
and causes other normalities, so that, according to hundreds of
research studies, we get less oxygen in the brain, heart and other body organs.
And, therefore, one of the effects is the
following: when you breathe more our diaphragm the breathing
muscle, and it should be the main breathing muscle at rest,
gets less oxygen and less carbon dioxide.
CO2 is a powerful relaxant of smooth muscles of the human body.
Bronchi, bronchioles, colon: these are all smooth muscles.
But the diaphragm is also a smooth muscle in the human body.
And, therefore, the diaphragm, when we hyperventilate, becomes
more tense, and people switch to chest breathing.
In addition, the diaphragm is going to get less oxygen supply,
and that worsens the state of the diaphragmatic muscle.
Therefore, people start to breathe using chest, and this is
exactly what we see in modern people. www.NormalBreathing.com