Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume. It is approximately equal to Forced Vital Capacity (FVC).[1][2]
A person's vital capacity can be measured by a wet or regular spirometer. In combination with other physiological measurements, the vital capacity can help make a diagnosis of underlying lung disease. Furthermore, the vital capacity is used to determine the severity of respiratory muscle involvement in neuromuscular disease, and can guide treatment decisions in Guillain–Barré syndrome and myasthenic crisis.[citation needed]
A normal adult has a vital capacity between 3 and 5 litres.[3] A human's vital capacity depends on age, sex, height, mass, and possibly ethnicity.[4] However, the dependence on ethnicity is poorly understood or defined, as it was first established by studying black slaves in the 19th century[5] and may be the result of conflation with environmental factors.[6]
Lung volumes and lung capacities refer to the volume of air associated with different phases of the respiratory cycle. Lung volumes are directly measured, whereas lung capacities are inferred from volumes.
^Chhabra, S. K. (January 1998). "Forced Vital Capacity, Slow Vital Capacity, or Inspiratory Vital Capacity: Which Is the Best Measure of Vital Capacity?". Journal of Asthma. 35 (4): 361–365. doi:10.3109/02770909809075669. PMID 9669830.
^"Forced Expiratory Volume and Forced Vital Capacity". Michigan Medicine.
^Cite error: The named reference VCaFPn was invoked but never defined (see the help page).
^Hutchinson, John (January 1846). "On the Capacity of the Lungs, and on the Respiratory Functions, with a View of Establishing a Precise and Easy Method of Detecting Disease by the Spirometer". Journal of the Royal Society of Medicine. MCT-29 (1): 137–252. doi:10.1177/095952874602900113. PMC 2116876. PMID 20895846.
^Villarosa, Linda (14 August 2019). "How False Beliefs in Physical Racial Difference Still Live in Medicine Today". The New York Times.
^Braun, Lundy (2015). "Race, ethnicity and lung function: A brief history". Canadian Journal of Respiratory Therapy. 51 (4): 99–101. PMC 4631137. PMID 26566381.
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Inspiratory capacity: the sum of IRV and TV IVC Inspiratory vitalcapacity: the maximum volume of air inhaled from the point of maximum expiration VC Vital capacity:...
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respectively, had a decline in forced vitalcapacity of at least 10%. In study 006, the difference between groups in forced vital capaticy change at week 72 was...
Inspiratory capacity: the sum of IRV and TV IVC Inspiratory vitalcapacity: the maximum volume of air inhaled from the point of maximum expiration VC Vital capacity:...
for phonation at lung volumes above 50 percent of vitalcapacity. Above 50 percent of vitalcapacity, the respiratory muscles are used to "check" the elastic...
things." Where vitalism explicitly invokes a vital principle, that element is often referred to as the "vital spark", "energy", "élan vital" (coined by vitalist...
pulmonary fibrosis. It has been shown to slow down decrease in forced vitalcapacity, and it also improves people's quality of life. Nintedanib does not...
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or Ireland Vomiting center (area postrema), a structure in the brain Vitalcapacity, a maximum amount of air a person can expel from the lungs after a maximum...
cage that support breathing weaken, measures of lung function such as vitalcapacity and inspiratory pressure diminish. In respiratory-onset ALS, this may...
can be breathed out in the first second of a breath and the forced vitalcapacity (FVC), which is the greatest volume of air that can be breathed out...
defects are defined by decreased TLC (total lung capacity), RV (residual volume), FVC (forced vitalcapacity) and FEV1 (forced expiratory volume in one second)...
is limited by the strength of the user's respiratory muscles and the vitalcapacity of their lungs. Many cultures have used such a weapon, but various indigenous...
The summed total of forced inspiration and expiration is a person's vitalcapacity. Not all air is expelled from the lungs even after a forced breath out;...
lung function. The total lung capacity (TLC), functional residual capacity (FRC), residual volume (RV), and vitalcapacity (VC) are all values that can...
respiratory function of the phrenic nerve. The instances where pulmonary vitalcapacity is reduced have typically been a result of use of the right phrenic...
inflammatory lesions of the cranial nerves and ocular muscles. The forced vitalcapacity may be monitored at intervals to detect increasing muscular weakness...
reduction in the vitalcapacity (VC) with either a proportionate reduction in airflows, or increased airflows for the observed vitalcapacity. The latter finding...
delayed motor milestones, difficulty swallowing or chewing and reduced vitalcapacity. One of the difficulties with attributing the illness solely to genetic...
COPD, as is the total lung capacity, while the vitalcapacity remains relatively normal. The increased total lung capacity (hyperinflation) can result...
both the FEV1 (forced expiratory volume in 1 second) and FVC (forced vitalcapacity) are reduced so the FEV1/FVC ratio is normal or even increased in contrast...
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