Deep Breathing and Hyperventilation: Dangers and Benefits
By Dr. Artour Rakhimov - Last updated on August 9, 2018
Deep breaths and changes in brain/body oxygen
Most people believe in the benefits of deep breathing.
They say, "Do any deep breathing since it is good for you". These people
also assume that breathing more air and automatic (unconscious) deep breathing
provides us with more oxygen, while CO2 is toxic. Even modern yoga books say that CO2
is a waste gas.
The image on the left shows effects of 1 minute of deep and fast breathing
(more air is delivered to the lungs) on the brain-oxygen level.
Normal breathing, as medical textbooks claim, provides the arterial blood with
nearly ideal or maximum possible oxygenation: about 98-99%.
How to get deep breathing benefits
Some people imply that deep breathing exercises and techniques should
be very slow (as during correctly practiced hatha yoga Pranayama) so
that one accumulates more CO2 in the blood. However, such breathing means breathing less
air (!) in comparison with the previous breathing pattern. This is a healthy
"deep breathing" exercise, although it is wrong to call it "deep breathing".
If you breathe less and accumulate CO2, the correct name is "reduced breathing".
By the way, classic yoga Sanskrit texts do not have any references for deep
breathing. There is a link to a webpage that provides quotes from most famous ancient yoga texts about breathing. This link is provided right down here as your bonus content.
Tweet or Share this page to reveal the bonus content.
For results of more than 40 clinical studies that measured breathing parameters in healthy people and people with diseases, see the Homepage of this site.
Pranayama, indeed, in order to be effective, should be done as
slowly as possible. (See Yoga web pages for details of traditional hatha yoga
teaching and quotes from ancient Sanskrit manuscripts. The link to Yoga web
pages is in the top menu.) Therefore, if we consider biochemical changes in
compositions of main gases in the lungs and blood (carbon dioxide and oxygen),
Pranayama or slow breathing exercises are examples of shallow or reduced
breathing (breathing less air than before the practice). As a result, it is
silly to call Pranayama a "deep breathing" exercise.
Therefore, in the remaining part of this article, deep breathing will
mean breathing more air with a reduction in alveolar CO2 levels. In medicine,
it is called hyperventilation.
Scientific evidence about the dangers of deep breaths
blood flow decreases 2% for every mm Hg decrease in CO2” Professor E.
Newton, Hyperventilation Syndrome, 2004 June 17, Topic 270, p. 1-7 (www.emedicine.com).
This fact is based on tens of studies that proved the same fact: more breathing
means less oxygen in body cells.
Many of these studies can be found on
CO2-Vasodilation web page (see links below) that provides tens of references
proving that low arterial CO2 (hypocapnia) reduces blood flow for the
brain, heart, kidneys, liver, colon, stomach, and other vital organs.
Deep breaths can cause symptoms
However, there is one real advantage of deep breathing. It is
called hyperventilation provocation test or deep breathing test.
The benefits of this test are in the immediate reproductions of symptoms of some
chronic diseases (heart disease, asthma, panic attacks, epilepsy seizures, and
some others). This deep breathing test has been used by hundreds of doctors for
decades. It helps to discover the most
vulnerable system or organ in people with many chronic conditions. The web
page Hyperventilation Provocation Test
provides numerous clinical studies and medical quotes.
Deep breathing can cause horrible chest pain
pain is one of the most unpleasant pains. In 1997, the American Journal of
Cardiology published results of a study with the title, Hyperventilation
as a specific test for diagnosis of coronary artery spasm (Nakao et. al,
1997). 206 patients with cardiovascular disease were asked to
hyperventilate. All of them had angina pain due to coronary artery spasms
and tissue hypoxia.
Even people without diagnosed heart disease can experience chest pain
due to deep breathing that causes CO2 losses and body hypoxia. Others can experience back
pain, spasm in the stomach muscles or other difficulties and problems due to effects of
hypoxia and hypocapnia.
Deep breathing causes breathing difficulties and more coughing
people who have some respiratory conditions (such as severe asthma,
bronchitis, emphysema, COPD, and so forth) often experience breathing
problems or breathing difficulties since CO2 is a powerful bronchodilator.
Therefore, overbreathing immediately causes bronchospasm and less oxygen
gets into the arterial blood since some bronchi and bronchioles can collapse
completely. This is how they develop and worsen their health problems.
Millions of people are looking for benefits or advantages of deep breathing
Millions of people search for deep breathing exercises for heart failure
patients. Others are looking for deep breathing to fight fatigue. Some
medical doctors, nurses, and physiotherapists demonstrate deep breathing or
lumbar deep breathing to their patients. These medical professionals
encourage coughing and deep breathing postoperatively or deep breathing for
patients with pneumonia fantasizing that deep abdominal breathing improves health.
Thousands of ordinary people believe in deep breathing benefits. Most
alternative health leaders are in the same state of confusion about the exact
parameters of breathing for ideal health. Very few of them can answer a simple
but important health question: "Which unconscious
breathing pattern provides us with maximum body oxygenation?"
Medical research studies and physiological science could not find any deep
breathing benefits or advantages of hyperventilation. There is not a single study that has proven or shown that, in ordinary conditions, people need to get rid of as
much carbon dioxide as possible or that there are some mysterious benefits of
deep breathing. In fact, a human being will die within minutes if carbon dioxide
level drops to a quarter or fifth of the physiological norm.
during correctly done Pranayama only looks deep for naive people. In fact, the
goal of Pranayama is to accumulate more CO2 due to reduced minute ventilation.
Hatha yoga masters should have only 1 breath per minute or even less during this yoga practice. See Yoga web pages for more detail.
At the same time, thousands of professional medical and physiological studies
and experiments have proven the adverse effects of acute and chronic
overbreathing (hyperventilation) and hypocapnia (low CO2 levels) on cells, tissues, organs and systems of the
human organism. Many professional publications and available scientific evidence
confirm the importance of normal carbon dioxide concentrations for various organs
and systems in the human body. This website has hundreds of research papers that
have proven that carbon dioxide is a regulator of numerous vital processes (see
links below). Most of all, low CO2 in the lungs causes low O2 levels in body cells.
Belief in the usefulness and benefits of deep breathing (or hyperventilation) is
one of the greatest superstitions that exists among the general population in
the West. Deep breathing myth is also common among modern yoga teachers and
can be found on their websites, articles, and books.
Therefore, it is suggested that patients with asthma, bronchitis, pneumonia,
COPD, cystic fibrosis, and other respiratory problems must not practice coughing out their
mucus and deep breathing postoperatively. If they breathe less, their bodies
will produce less mucus and cilia will work better to remove any existing mucus
(since cilia also require more oxygen and blood supply for better work). Any
deep abdominal breaths should be done as slowly as possible, only as an
exercise, with the purpose to increase CO2 in the body and breathe slower
and less later. Patients with pneumonia should follow the same rules if they
want to improve their health. Deep breaths
can fight fatigue and heart failure
only if these patients accumulate more CO2 during exercise and breathe less
afterward or, even better, 24/7.
Historical roots of the deep breathing myth and CO2 myth
In the 1780s, French scientist Antoine-Laurent Lavoisier determined the
composition of air. He also discovered the mechanism of gas exchange during
respiration. Oxygen is consumed for the production of energy and carbon dioxide
is expelled as an end product. In his classical experiments, mice died in a
closed glass jar in an atmosphere containing large quantities of carbon dioxide
and almost no oxygen. A candle also quickly expired in this air.
That was probably the time when a superficial understanding of respiration
produced the idea that carbon dioxide was “toxic, waste, and poisonous” gas
while oxygen brought life and vigor. “Take a deep breath”, “Breathe more air, it
is good for your health”, “Breathe deeper, get more air in your lungs, we need
oxygen”, etc. became popular phrases. Even now, some scientific publications contain such misleading sentences, as
“Respiration is the process of oxygen delivery.”
Yale University Professor Yandell Henderson (1873-1944), the father of
cardiorespiratory physiology, the author of the first physiological textbooks
gave the following explanation of this ignorance,
“Likeness of Life to Fire. Lavoisier's supreme contribution to science and
particularly to physiology was the demonstration that, in their broad outlines,
combustion in a fire and respiratory metabolism in an animal are identical. Both
consist of the union of oxygen from the air with carbonaceous material: and both
result in the liberation of heat and the production of carbon dioxide…
The human mind is inherently inclined to take a moralistic view of nature.
Prior to the modern scientific era, which only goes back a generation or two, if
indeed it can be said as yet even to have begun in popular thought, nearly every
problem was viewed as an alternative between good and evil, righteousness and
sin, God and the Devil. This superstitious slant still distorts the conceptions
of health and disease; indeed, it is mainly derived from the experience of
physical suffering. Lavoisier contributed unintentionally to this conception
when he defined the life-supporting character of oxygen and the suffocating
power of carbon dioxide. Accordingly, for more than a century after his death,
and even now in the field of respiration and related functions, oxygen typifies
the Good and carbon dioxide is still regarded as a spirit of Evil. There could
scarcely be a greater misconception of the true biological relations of these
PHYSIOLOGY. **Relations of Carbon Dioxide and Oxygen in the Body.** Carbon dioxide is, in fact, a more fundamental component of living matter than
is oxygen. Life probably existed on earth for millions of years prior to the
carboniferous era, in an atmosphere containing a much larger amount of carbon
dioxide than at present. There may even have been a time when there was no free
oxygen available in the air. Even now, such animals as ascaris will live and be
active in an atmosphere of hydrogen and entirely without oxygen” Henderson Y,
Carbon dioxide, in Cyclopedia of Medicine, ed. by HH Young, Philadelphia, FA
This YouTube video analyzes
and corresponding oxygenation of tissues and explains that deep unconscious
breathing reduces brain O2 content.