Rib cage contribution to ventilation increases during NREM sleep, mostly by lateral movement, and is detected by an increase in EMG amplitude during breathing.
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Changes in volume of the thoracic cavity can also be inferred from displacements of the rib cage and diaphragm.
The transducer bands are placed around the rib cage under the armpits and around the abdomen at the level of the umbilicus (belly button).
Ujjayi is a diaphragmatic breath, which first fills the lower belly (activating the first and second chakras), rises to the lower rib cage (the third and fourth chakras), and finally moves into the upper chest and throat.