10
votes
Accepted
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 ...
- 4,355
8
votes
Accepted
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 ...
- 4,355
7
votes
Accepted
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 ...
- 4,695
5
votes
Accepted
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 ...
- 12.9k
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 ...
- 2,250
5
votes
Accepted
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 ...
- 449
4
votes
Accepted
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 ...
- 6,570
3
votes
Is there a nonchronic disease with similar effects to lungs like those of emphysema?
Yes, damage to the alveolar walls or the reduction in surface area for gaseous exchange can be reversible. Additionally, acute (non-chronic) conditions can cause these circumstances. For example, in ...
- 164
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 ...
- 817
1
vote
Accepted
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 ...
- 6,722
1
vote
Accepted
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 ...
- 13.2k
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 ...
- 101
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 ...
- 13.2k
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 ...
- 13.2k
1
vote
Accepted
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 ...
- 1,770
Only top scored, non community-wiki answers of a minimum length are eligible