Thank you for your interest in this workshop! Below are the sources I reference that make my case for breathing abdominally through the nose.

A Case Against Chest Breathing

“A research study was carried out with 153 heart attack patients in the coronary care unit of a Minneapolis-St. Paul hospital. These patients were examined to determine whether they were abdominal diaphragmatic breathers or thoracic breathers, whose tight abdominal muscles forced them into the labored chest-lifting characteristics of shallow breathers. The results of the survey were devastatingly clear: every single one of the 153 patients examined were thoracic breathers!”
—Thomas Hanna, Somatics

The study is Hymes, A., and Neurenber, P. “Breathing patterns found in heart attack patients.” Research Bulletin of the Himalayan International Institute 2(2) (1980)

A Case for Slow Breathing through Nose

“Slow breathing techniques act enhancing autonomic, cerebral and psychological flexibility in a scenario of mutual interactions: we found evidence of links between parasympathetic activity (increased HRV and LF power), CNS activities (increased EEG alpha power and decreased EEG theta power) related to emotional control and psychological well-being in healthy subjects.”

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6137615/

A Case for Deep Abdominal Breathing as a Lymphatic Pump:

“Breathing acts by increasing flow from the lymphatic system into the venous system through the thoracic duct. Schad et al., [31] found increased thoracic duct flow during hyperventilation in anaesthetized dogs, while opening the thoracic cavity decreased intrathoracic pressure, and as a result, decreased flow through the thoracic duct. These authors suggested that during inspiration there is a drop in intrathoracic pressure and an increase in intra-abdominal pressure as the diaphragm pushes down, with consequent movement of lymph from the abdominal to the thoracic cavity. During expiration they suggested that the increase in intrathoracic pressure causes lymph to be expelled through the thoracic duct into the upper thorax.”

https://link.springer.com/article/10.1007/BF00584444

A Case against Mouth breathing for Hydration

“Mouth breathing causes the body to lose 40% more water.”
—James Nestor, Breath