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You may need oxygen if: Arterial partial pressure of oxygen (Pa O2) is less than or equal to 55 mm Hg (millimeters of mercury, a measure of pressure).Arterial oxygen saturation is less than or equal to 88%.

Arterial oxygen saturation is greater than 88% when you are resting but becomes less than or equal to 88% when you are exercising or sleeping.Using oxygen during exercise may help boost performance and reduce shortness of breath for some people.But there are no studies that show any long-term benefits from using oxygen during exercise. During sleep, breathing naturally slows down because the body doesn't need as much oxygen.Do not use oxygen around lit cigarettes or an open flame.If you or those who care for you smoke, or if there are other risks for fire, it is important to consider oxygen treatment very carefully because of the danger of fire or explosion.Your life expectancy increases in years as you click on the calculator, based on your answers.

The lower the Real Age Life Expectancy Calculator software shows your age to be the better your condition.

Even with all the negative factors, such as obesity, smoking and diabetes, those who were, let's say, obese and ran had a less likely chance of dying from heart problems than those obese people who didn't run.

Same with smokers, diabetics, etc."Research presented at the American College of Cardiology recently found those who run more than 20 miles a week have shorter life spans compared to non runners.

Why It Is Done Long-term oxygen therapy is used for COPD if you have low levels of oxygen in your blood (hypoxia).

It is used mostly to slow or prevent right-sided heart failure. Oxygen may be given in a hospital if you have a rapid, sometimes sudden, increased shortness of breath (COPD exacerbation).

How Well It Works Several studies show that using oxygen at home for more than 15 hours a day increases quality of life and helps people live longer when they have severe COPD and low blood levels of oxygen.1, 2 Oxygen therapy has good short-term and long-term effects in people who have COPD.3 Using oxygen may also improve confusion and memory problems.