my only concern would be trying to breath at terminal velocity with weak lungs... because the speed you will be falling is about 120 mph, and average hight of 13,000 feet<--Fact... But the Theory is (Im gonna Go Science on yall) as High speed air passes an opening it creates suction. so in Theory being Weak lunged it could be hard to breath during Free Fall..I HAVE NOT skydived but always wanted to... have a friend that used to and she backs me up on that Theory part.. However, I Have Rode a Motorcycle about that fast *cough 120mph COUGH* <---Guilty and the wind was moving quite fast. i had a helmet on so the air was slowed down enuff for me to breath plus it was getting crammed in the front due to the Ram Effect... so i dont have 100% proof....ALL im trying to say is. IT COULD BE difficult to breath in the thinner air and fast falling Speed....
In a Commercial Airlines in a Pressureized Cabin the atmosphere is is to 6,000-8,000 Ft so you wont be Much over that..but after 10,000 ill also include some things that could happen as far as Oxygen gose... Dont get me wrong im not saying dont i love the rush of air past my head on the Bike i can accualy seem to breath Better. but a bike is diffrent that threw the air..just letting you know the possibilities of what COULD happen. but im a Thrill Seeker so unless someone Beets me to it ill post what its like right after I Dive... <img src="i/expressions/face-icon-small-smile.gif" border="0">
Hypoxia- The low partial pressure of oxygen at altitude reduces the alveolar oxygen tension in the lungs and subsequently in the brain leading to sluggish thinking, dimmed vision, loss of consciousness and ultimately death. In some individuals, particularly those with heart or lung disease, symptoms may begin as low as 1,500 metres (4,900 ft) above sea level although most passengers can tolerate altitudes of 2,500 metres (8,200 ft) without ill effect. At this altitude, there is about 25% less oxygen than there is at sea level.[1] Hypoxia may be addressed by the administration of supplemental oxygen, usually through an oxygen mask sometimes through a nasal cannula.
Altitude sickness- The low local partial pressure of carbon dioxide (CO2) causes CO2 to out-gas from the blood raising the blood pH and inducing alkalosis. Passengers may experience fatigue, nausea, headaches, sleeplessness and on extended flights even pulmonary oedema. These are the same symptoms that mountain climbers experience but the limited duration of powered flight makes the development of pulmonary oedema unlikely. Altitude sickness may be controlled by a full pressure suit with helmet and faceplate, which completely envelopes the body in a pressurized environment; this is clearly impractical for commercial passengers.
Decompression sickness- The low local partial pressure of gases, principally nitrogen (N2) but including all other gases, may cause dissolved gases in the bloodstream to precipitate out resulting in gas embolism or bubbles in the bloodstream. The mechanism is the same as for compressed air divers on ascent from depth. Symptoms may include the early symptoms of the diver's bends: tiredness, forgetfulness, headache, stroke, thrombosis subcutaneous itching but rarely the full symptoms of the bends. Decompression sickness may also be controlled by a full pressure suit as for altitude sickness.
Barotrauma- As the aircraft climbs or descends passengers may experience discomfort or acute pain as gases trapped within their bodies expand or contract. The most common problems occur with air trapped in the middle ear (aerotitus) or paranasal sinuses by a blocked Eustachian tube or sinuses. Pain may also be experienced in the gastrointestinal tract or even the teeth (barodontalgia). Usually these are not severe enough to cause actual trauma but can result in soreness in the ear that persists after the flight and can exacerbate or precipitate pre-existing medical conditions such as pneumothorax (collapsed lung).
In a Commercial Airlines in a Pressureized Cabin the atmosphere is is to 6,000-8,000 Ft so you wont be Much over that..but after 10,000 ill also include some things that could happen as far as Oxygen gose... Dont get me wrong im not saying dont i love the rush of air past my head on the Bike i can accualy seem to breath Better. but a bike is diffrent that threw the air..just letting you know the possibilities of what COULD happen. but im a Thrill Seeker so unless someone Beets me to it ill post what its like right after I Dive... <img src="i/expressions/face-icon-small-smile.gif" border="0">
Hypoxia- The low partial pressure of oxygen at altitude reduces the alveolar oxygen tension in the lungs and subsequently in the brain leading to sluggish thinking, dimmed vision, loss of consciousness and ultimately death. In some individuals, particularly those with heart or lung disease, symptoms may begin as low as 1,500 metres (4,900 ft) above sea level although most passengers can tolerate altitudes of 2,500 metres (8,200 ft) without ill effect. At this altitude, there is about 25% less oxygen than there is at sea level.[1] Hypoxia may be addressed by the administration of supplemental oxygen, usually through an oxygen mask sometimes through a nasal cannula.
Altitude sickness- The low local partial pressure of carbon dioxide (CO2) causes CO2 to out-gas from the blood raising the blood pH and inducing alkalosis. Passengers may experience fatigue, nausea, headaches, sleeplessness and on extended flights even pulmonary oedema. These are the same symptoms that mountain climbers experience but the limited duration of powered flight makes the development of pulmonary oedema unlikely. Altitude sickness may be controlled by a full pressure suit with helmet and faceplate, which completely envelopes the body in a pressurized environment; this is clearly impractical for commercial passengers.
Decompression sickness- The low local partial pressure of gases, principally nitrogen (N2) but including all other gases, may cause dissolved gases in the bloodstream to precipitate out resulting in gas embolism or bubbles in the bloodstream. The mechanism is the same as for compressed air divers on ascent from depth. Symptoms may include the early symptoms of the diver's bends: tiredness, forgetfulness, headache, stroke, thrombosis subcutaneous itching but rarely the full symptoms of the bends. Decompression sickness may also be controlled by a full pressure suit as for altitude sickness.
Barotrauma- As the aircraft climbs or descends passengers may experience discomfort or acute pain as gases trapped within their bodies expand or contract. The most common problems occur with air trapped in the middle ear (aerotitus) or paranasal sinuses by a blocked Eustachian tube or sinuses. Pain may also be experienced in the gastrointestinal tract or even the teeth (barodontalgia). Usually these are not severe enough to cause actual trauma but can result in soreness in the ear that persists after the flight and can exacerbate or precipitate pre-existing medical conditions such as pneumothorax (collapsed lung).