10 votes
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How to reduce apnea/hypoapnea events?

The Apnea-Hypopnea Index (AHI) is a measure of severity in obstructive sleep apnea. It is calculated as the number of times per hour that the airway partially or completely collapses, associated with ...
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8 votes
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Pulmonary diseases and oxygen therapy

The basic idea is that people with pulmonary diseases that involve chronic hypoventilation rely on mild hypoxia to stimulate respiration. To understand this, consider a basic homeostatic feedback ...
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7 votes
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Effect of cigarettes on passive smokers

Passive (or secondhand) smoking can increase your risk of cancer and other health problems. Inhaled smoke is a mixture of smoke from the burning end of a cigarette or cigar and the smoke exhaled from ...
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5 votes
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What is "recognized clinically"? Is there any special meaning in the word "clinically" here?

"Clinically" in this context means "by doctors in the clinic" in their normal practice. It excludes research contexts, and implies "real-world" circumstances. There is no ...
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5 votes

Effect of cigarettes on passive smokers

According to The Better Health Channel (independant of any business, funded by the State Government of Victoria, Australia), passive smokers are exposed to many health risks that include long-term ...
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5 votes
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Does carbon monoxide poisoning make you tired before it kills you?

Does carbon monoxide poisoning make you tired before it kills you? The symptoms of carbon monoxide poisoning can vary per person it affects, and it can also depend on the the levels of exposure to ...
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4 votes
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Simulate hypoxic training by breath holding/regulation

The approach you describe most likely will not work, and could be detrimental to your training. The main benefit of training at altitude is that the body will adapt to the lower concentration of ...
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2 votes

How to reduce apnea/hypoapnea events?

As a patient, Mayo Clinic physicians have indicated to me, as a patient, that weight loss can improve your position (reduce / eliminate apnea+hypoxia events) and reduce the need and possibly eliminate ...
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1 vote
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if diameter of alveoli is reduced to half, resistance becomes?

The resistance is defined as pressure difference per flow (basically just an application of Ohm's law). With Hagen-Poiseulle: So if the alveoli diameter is reduced to half (resulting in a halved ...
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1 vote
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How is nitrogen not exchanged in respiration?

There is no specific mechanism to carry nitrogen in blood, it is carried in a dissolved form unlike oxygen which uses the protein haemoglobin which is contained in red cells. Animals can not utilize ...
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1 vote

Simulate hypoxic training by breath holding/regulation

Since there is a good answer already I'll just add my two cents from my understanding of physiology: Hypoventilation has two effects during exercise: Less available oxygen in your lungs and a ...
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1 vote

Why is predicted FVC calculated on height only (and not weight)?

Predicted Normal Values Many studies have published lung function reference values for a variety of race/ ethnic groups, countries, and age ranges. Populations of interest are sampled and spriometric ...
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1 vote

Strengthening / recovering lungs? What is the science behind this?

One of the largest differences between an exerciser and a nonexerciser concerns the heart's ability to pump blood and consequently deliver oxygen to working muscles. Cardiac output is a major limiting ...
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1 vote
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What effects does an oxygen saturation between 90% and 94% have on the body?

Reduced oxygen saturation in blood is called hypoxia (though strictly that means reduced oxygen in the tissues). If there is marked reduction in oxygen saturation of blood, it may lead to bluish ...
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