KINE 3012 Chapter Notes - Chapter 13.7: External Intercostal Muscles, Accessory Muscle, Chronic Obstructive Pulmonary Disease
11 Feb 2018
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Like with copd, more work required to achieve greater pressure gradient to overcome reistance so adequate air flow occurs: elastic recoil is decreased. Like w/ emphysema, passive expiration may be inadequate to expel the volume of air normally exhaled during quiet breathing to expel volume of air normally exhaled. Abdominal muscles must work to help emptying lungs: increased need for ventilation. During exercise, more work required to accomplish greater depth of breathing ( larger volume of air moving in & out) & at faster rate of breathing (more breaths/min) Lung volume & capacities: tidal volume (tv): volume of air entering or leaving lungs during single breath. Inspiratory reserve volume (irv): extra volume of air that can be maximally inspired over the resting tv. Irv is accomplished by maximal contraction of diaphragm, external intercostal muscles & accessory muscles. Inspiratory capacity (ic): maximal volume of air that can be inspired.
