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Re:Diaphragmatic Breathing Exercises and the Vagus Nerve (2017) by nsouth on Tuesday March 20, 2018 @04:01PM (#16632006)
The key word is spontaneous breath retention. Google "kevala kumbhaka". Not BS at all, in fact it is a primary aim of the breathing exercises known as pranayama and is very widely documented within yogic texts, both old and current.
Re:Diaphragmatic Breathing Exercises and the Vagus Nerve (2017) by djtriptych on Tuesday March 20, 2018 @06:46PM (#16633499)
While breath retention is part of pranayama techniques, they are NOT beginner techniques, and misuse certainly does have the capacity to do damage.

Consider the inner breath as a pneumatic tool. Can you imagine holding in a powerful sneeze or cough and hurting yourself? That’s the power of the diaphragm. Getting it under control cannot be done overnight, and retention techniques increase the risk of accidental injury.