How It Happens
The term 'diaphragmatic' is sometimes misinterpreted to imply that the thoracic diaphragm is not used in shallow breathing. This is a misunderstanding as the diaphragm is used in either case.
Due to the lung expansion being lower (inferior) on the body as opposed to higher up (superior), it is referred to as 'deep' and the higher lung expansion of rib cage breathing is referred to as 'shallow'. The actual volume of air taken into the lungs with either means varies.
Read more about this topic: Diaphragmatic Breathing
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