by Big H » Sat Nov 19, 2016 4:13 am
Time catches up with everyone.....period....
Lung Capacity and Aging
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.
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Lung function is dependent upon lung volumes, according to NCBI. The lung volumes are vital capacity, total lung capacity and residual volume. Vital capacity is the maximum amount of air that an individual can forcibly exhale after breathing in as deeply as possible, says The Free Dictionary by Farlex.
The vital capacity depends on the maximum inspiratory pressure, says NCBI. The MIP indicates diaphragm muscle strength, and the diaphragm is the most important breathing muscle. A decline in MIP correlates with a decline in vital capacity.
Men have an MIP that is 30 percent higher than women, but the decline in MIP with age is steeper for men than women, reports NCIB. They also found that the MIP declines by 0.8 centimeters to 2.7 centimeters of H2O per year. This means the diaphragm strength weakens with age, thus decreasing the vital capacity. Other age-related changes in the respiratory system, including structural changes in the chest wall, lead to an overall decline in the function of the respiratory system.