
Diaphragmatic breathing, abdominal breathing, belly breathing or deep breathing is breathing that is done by contracting the diaphragm, a muscle located horizontally between the chest cavity and stomach cavity. Air enters the lungs and the belly expands during this type of breathing. This deep breathing is marked by expansion of the abdomen rather...
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http://en.wikipedia.org/wiki/Diaphragmatic_breathing

diaphragmatic respiration. a type of breathing exercise that patients are taught to promote more effective aeration of the lungs, consisting of moving the diaphragm downward during inhalation and upward with exhalation.
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http://www.encyclo.co.uk/local/21001
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