work of breathing
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work of breathing (WOB)
the effort required to inspire air into the lungs. WOB accounts for 5% of total body oxygen consumption in a normal resting state but can increase dramatically during acute illness.
work of breath·ing(wŏrk brēdh'ing)
The total expenditure of energy necessary to accomplish the act of breathing; may be computed in terms of the pulmonary pressure multiplied by the change in pulmonary volume, or in terms of the oxygen cost of breathing (i.e., the O2 consumption above basal metabolic O2 use attributable to breathing).
work of breathingAbbreviation: WOB
The amount of effort used to expand the lungs. It is determined by lung and thoracic compliance, airway resistance, and the use of accessory muscles for inspiration or forced expiration. It is measured in joules/L, joules/min and sometimes kg/m/min. The measurement of the WOB is analogous to the typical description of work in physics (work = force x distance). In respiratory physiology, work = pressure x volume.
See also: work