Self Help Health Tools:Lung Capacity Calculator.
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- Lung Capacity Calculator.
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Calculate Lung Capacity! This Calculator is used to find the Lung Capacity. Lung volumes and lung capacities refer to the volume of air associated with different phases of the respiratory cycle.The average total lung capacity of an adult human male is about 6 litres of air.Tidal breathing is normal, resting breathing; the tidal volume is the volume of air that is inhaled or exhaled in only a single such breath.The average human respiratory rate is 30-60 breaths per minute at birth, decreasing to 12-20 breaths per minute in adults.
The human lungs enable respiration. When air is inhaled, the lungs extract oxygen and transfer it to the blood where the oxygen is then carried to cells. The blood supplies cells with oxygen and collects carbon dioxide, a waste resulting from cell functions. The carbon dioxide is then carried back to the lungs where it is exhaled.
No physical exertion is required for this Lung Capacity Calculator. You simply need to enter your Inspiratory Reserve Volume, Tidal Volume, Exspiratory Reserve Volume, Residual Volume, into the form below.
Did you know that the maximum amount of air your lungs can hold—your total lung capacity—is about 6 liters? That is about three large soda bottles.
Your lungs mature by the time you are about 20-25 years old. After about the age of 35, their function declines as you age and as a result, breathing can slowly become more difficult over time.
What Happens?
There are several body changes that happen as you get older that may cause a decline in lung capacity:
Muscle and bone changes:
The diaphragm, the large muscle that moves air in and out of the lungs, gets weaker, decreasing the ability to inhale and exhale.
Ribcage bones become thinner and change shape, altering the ribcage so that it is less able to expand and contract with breathing.
Lung tissue changes:
Muscles and tissues that usually keep airways open lose elasticity, causing some to close.
Alveoli, the small sacs where the exchange of oxygen and carbon dioxide happens with the bloodstream, can lose their shape and become baggy.
Nervous system changes:
The part of the brain that controls breathing may no longer send as strong or clear a signal to the lungs.
Nerves in airways that trigger coughing become less sensitive to foreign particles. When particles build up in the lungs, they can damage the lung tissue.
All of these changes can cause air to get trapped, decreasing the amount of oxygen moving in and carbon monoxide moving out of the bloodstream.
Measuring Lung Capacity:
Spirometry is a diagnostic test that provides different measures of lung capacity. For the test, you blow into the mouthpiece of a device called a spirometer, which measures the amount and speed of air you can exhale.
Often used to diagnose chronic obstructive pulmonary disorder (COPD) or asthma, spirometry results are also used to see if your breathing has improved after treatment for a lung condition. Spirometry can be a useful indicator of lung age when your results are compared to others the average results of other people your age.
Some examples of spirometry measurements your healthcare provider will look at:
Forced vital capacity: the maximum amount of air you can forcibly exhale from your lungs after fully inhaling. It is about 80 percent of total capacity, or 3.8 liters, because some air remains in your lungs after you exhale. Forced vital capacity can decrease by about 0.2 liters per decade, even for healthy people who have never smoked.
Forced expiratory volume (FEV): the amount of air you can exhale with force in one breath. FEV1 is the amount of air you can exhale with force in 1 second. FEV1 declines 1 to 2 percent per year after about the age of 25, which may not sound like much but adds up over the course of a lifetime.
Total lung capacity (TLC):
Total lung capacity refers to the maximum amount of air a person’s lungs can hold, about four to six liters (4000 to 6000 cm3) for the average human. Only a third of this capacity is used during normal activity, but this fraction increases during strenuous activity when the body requires more oxygen. On average, males have a 20-25% higher capacity than females, and tall individuals have a greater capacity than short people.
The human lungs enable respiration. When air is inhaled, the lungs extract oxygen and transfer it to the blood where the oxygen is then carried to cells. The blood supplies cells with oxygen and collects carbon dioxide, a waste resulting from cell functions. The carbon dioxide is then carried back to the lungs where it is exhaled.
Those who live in areas at higher altitudes also have a higher lung capacity than those who live at sea level. This is because air is less dense at high altitudes, and thus the concentration of oxygen is lower. Lungs, therefore, have to inhale a greater volume of air to extract the same amount of oxygen than they would have to at sea level.
Total lung capacity (TLC) is measured by adding together Inspiratory Reserve Volume (IRV), Tidal Volume (Vt), Expiratory Reserve Volume (ERV), and Residual Volume (RV) to come up with the formula, TLC=IRV + Vt + ERV + RV. Tidal Volume is the amount of air normally inhaled or exhaled. Inspiratory Reserve Volume is the amount of additional air that could be inhaled in order to completely fill up the lungs. Expiratory Reserve Volume is the amount of additional air that can be expelled after a normal exhale. These values are measured with a spirometer. There is a certain amount of air that cannot be exhaled under any circumstances. This is the Residual Volume and is measured by other pulmonary function tests.
It is important to keep the lungs healthy because all cells need oxygen to function. Cigarette smoke reduces lung capacity by causing lung disease. One of these diseases is emphysema which destroys the alveoli--the air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place. As a result, the lungs lose elasticity and are unable to stretch properly, thus reducing the amount of air that is able to be inhaled. Asthma, a disease that causes inflammation of the lungs, and chronic obstructive pulmonary disease (COPD), the combination of chronic bronchitis and emphysema, also decrease total lung capacity.
♣ Lung Capacity Calculator Formula:
Lung Capacity Calculator Formula:
total lung capacity = IRV + TV + ERV + RV
vital capacity = IRV + TV + ERV
functional residual capacity = ERV + RV
inspiratory capacity = TV + IRV
Where:
IRV: Inspiratory Reserve Volume
TV: Tidal Volume
ERV: Exspiratory Reserve Volume
RV: Residual Volume
