Here is something I will re type from Takimiyagi's book where he talks about: I believe that this was also in the 'Blue Book" Master Uechis Kihon
>>>Breathing methods. from Uechiryu and Shoheiryu for the 21st Century
An understanding of breathing methods must be present for effective kata performance. Technical groups of movements are separated not only by pauses but by breaths within these pauses, which both articulate the kata rhythm and prepare the performer physically for the next set of movements.
The basic breathing method is that learned in SANCHIN kata; an " interrupted" breath, short sharp and explosive.
This is not an un aspirated exhalation but a clearly defined aspired 'hiss' originating from the strained abdomen and expelling air through the mouth.
The focus of the breath must be on the exhalation: replenishment of air must be allowed to take place naturally through the nose, immediately following the exhalation. This kind of breath is seen in all katas.
A second kind of breath is seen only in the upper ranks kata ( seichin, seisan, seiryu, kanchin, sanseiryu, and ryuko): this is a continuant breath, long and sustained.
The patterns of these two kinds of breaths occur in conjunction with variations in the pairs of opposite features, short and sharp breaths combining with long sustained breaths as the movements dictate.
Except in training kata sanchin, no breathing should be exercised in a regular structured pattern. It should always take place in compliance with a performers physical demands.
These bodily demands, the logical divisions of techniques, and the combinations pf the paired opposite features will determine the placement and type of breathing in a kata performance.