What will help determine such an indicator as lung capacity? On average, it is several liters and depends on the age, gender, and general fitness of the body.
or simply the VC is an important physiological indicator that characterizes the amount of air that a person is able to inhale and then exhale while taking the maximum breath. This parameter can be determined using spirometry, which is the main method. In an adult healthy person, lung capacity averages from 2.5 to 5 liters and depends on a large number of factors. The effect on the volume of respiratory volume has a floor.In women, the VC is slightly lower in comparison with men. Physical development also has its effect. Here plays the role of the chest. The development of the respiratory system contributes to sports, as well as, in fact, the sport, whether it is running, skiing, swimming or something else. Plays a role and age. As aging progresses, the VC decreases.
Such a concept as the vital capacity of the lungs, the national team, it includes several parameters that have different values. The first thing that determines is the tidal volume (TO), which consists of the amount of air that is able to enter and escape from the lungs during the normal act of breathing. For a healthy adult, this figure is 500-600 milliliters. Then find out the reserve volume of breath (ROVD). It characterizes a certain amount of air that can get after a quiet act of inhalation. On average, for a healthy person, this figure is 1.5-2 liters. The maximum amount of air that can be released after a quiet exhalation is called “reserve expiratory volume” (ROVyd). This figure, in turn, is from 1 to 1.5 liters.
There is still something to determine
Even if all the air is exhaled completely, a small amount of air remains in the lungs, which prevents them from falling down - this is residual volume (OO). Due to it, it is possible to diagnose whether the fetus is born alive or, on the contrary, dead. The child who made the first cry has straightened lungs. When they are immersed in water at the autopsy, they do not sink. If a woman has given birth to a dead fetus, they will stone to the bottom. This feature is widely used in their practice by forensic experts. Dead Space Volume (MLE) is an indicator that also characterizes lung capacity. On average, it is about 150 milliliters. This indicator characterizes the amount of air in the airways, including the alveoli, in which, in fact, gas exchange takes place. Oxygen is not involved in gas exchange. The more human volume of dead space in the respiratory tract, the harder it is to breathe.
How to determine?
If you have learned how to determine all the indicators of breathing, and you need to do this, then you should properly prepare and stand for five minutes in a state of rest.Then 3 times with intervals of five minutes is determined by the VC and is compared with the required indicators. This is the actual lung capacity. On average, it is in a healthy man, male or female, an indicator that can be calculated by a special formula. For this, the height in centimeters is multiplied by 25 (males) or 20 (females) and taken as 100%. Next, using a simple calculation, determine the number of percent by which the resulting value differs from what should be. The difference of numbers in normal should not exceed from 15 to 20%. Do not forget that after a certain physical load on the body, the VC decreases, but for a trained person this difference is no more than 15%.
Link lung volume and exercise
Lung capacity is also measured after a certain physical exertion. Before that, you should stand for five minutes and determine the indicators of VC three times with an interval of five minutes, calculate the average value. For 2 minutes, exercise is performed. This may be running in place with a frequency of approximately 180 steps in one minute. It is necessary to tear off a leg from a floor not less than on five centimeters.After the run is over, the respiration rates are determined again. The capacity of the lungs, on average, is somewhat less, due to the fact that the vessels located in the small circle of blood circulation are filled with blood.
What are the indicators and what influences them?
The vital capacity of the lungs, on average, is, as already mentioned, from 2.5 to 5 liters. Everything just depends on gender, age, and fitness of the body. In women, the lung capacity, on average, ranges from 2.5 to 4 liters, for men, this indicator is slightly higher and ranges from 3.5 to 5 liters. But if a person is very large (for example, a basketball player), then he is able to rise up to 9 liters. Absolute indicators of VCs should always be considered relative, primarily due to their individual fluctuations, and “due” or standard indicators are always used to evaluate results.
Breathing is normal
The frequency of breathing in humans is on average from 14 to 16 for a minute. A quiet inhalation lasts and a quiet exhalation following it for 3 to 4 seconds, which constitutes the breathing cycle. The lungs are ventilated depending on the body's need for oxygen, as well as age.The gas composition of inhaled air includes a large number of elements, predominant among which, of course, oxygen. The flow rate of inhaled air is normally half a liter per second, and the resistance of the airways is 1.7 cm of water. st. Deviations from these indicators may directly or indirectly indicate respiratory failure. A man, oddly enough, can breathe through the skin, which provides the body with about 5% of all oxygen. If pulmonary respiration is impaired due to the disease, the diffusion of gases through the skin can increase up to 10%.
Evaluation of the result
After the patient receives the results, they should be interpreted correctly. It is bad when the VC is reduced by more than 200 ml. After the load, a decrease in the initial rate of more than 15% gives reason to talk about the low fitness of a person and his reduced health. The functionality of the organism and the small circle in particular is small.
Blood transport function
To assess the transport function of the blood, using the indicator of blood oxygen saturation and the ratio of its tissue utilization. This is the ratio of the amount of O2in the test blood to its oxygen capacity. Normally, human arterial blood is saturated with oxygen by 96-98%, and venous - by 90-92%.