Continuous Disconnected Breathing
Continuous disconnected breathing is simply inhaling and exhaling at a steady rate with no regard to whether you are blocking or attacking. This type of breathing is useful while performing patterns since it requires less energy and is relaxing. During sparring, there is no obvious breathing pattern that will alert an opponent to an attack. A disadvantage with this pattern of breathing is that the body is not hardened against any techniques that may slip through your defenses during exhalations.
Ibuki breathing is a hoarse, heavy, noisy breathing pattern that involves contracting the muscles in an isometric fashion while breathing out strongly through the mouth. A noise is created by tightening the throat to provide resistance to the exhale. Many believe this resistance helps strengthen the abdominal muscles. It is used by karate stylists when they perform the Sanchin pattern. Some people perform ibuki breathing silently.
Which Breathing Pattern is Best?
Each pattern has its own advantages and disadvantages. No scientific studies have been done to confirm whether any particular breathing pattern has any significant affect on power or speed. Many seasoned black belts doubt the need to synchronize breathing with blocks or attacks. They feel that continuous disconnected breathing is the best way to breath.