30 Nov '15, 10pm

Why breathing cold air while running hurts and how you can prevent it:

The lung is an amazing organ, evolved to warm and humidify inhaled air to body temperature and humidity without damaging tissue. Think of a tree with two main branches splitting off from the trunk and then splitting into smaller and smaller branches until the tiny branches sprout leaves. Turn the tree upside down and shrink it to chest size and you have the lung with the trachea as the trunk and the alveoli (air sacks) as leaves. The warming and humidification of the air occurs rapidly starting in the mouth and nose, reaching body temperature and 100 percent humidity before the air gets too deep into the respiratory tree. As air moves deeper into the alveoli that lie in direct contact with the blood vessels, it exchanges oxygen for carbon dioxide. While inspired air is cooling the lung tissue, the expired air adds some heat back to the cooled tissues on the way out of the ...

Full article: http://www.runnersworld.com/ask-the-sports-doc/why-breath...

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