Peripheral vision and depth perception loss
Reaction time loss
This outward breathe has a detaching effect. As the air is exhaled with slow, steady, and deliberate control you feel your shoulders drop even more with out losing the straight back, neck, and head position. You feel the muscles of your entire body relax as if they were made of a gaseous material.
The yoga breathing exercises reduce the work load on the heart in two ways. Firstly, deep breathing leads to more efficient lungs, which means more oxygen is brought into contact with blood sent to the lungs by the heart. So, the heart doesn't have to work as hard to deliver oxygen to the tissues. Secondly, deep breathing leads to a greater pressure differential in the lungs, which leads to an increase in the circulation, thus resting the heart a little.
Additional oxygen tends to normalize brain function and reduces anxiety levels.
Maintain proper breathing techniques when practicing fighting arts to avoid injury—breathing out during the contraction portion of any stretching movement, and breathing in during the extension portion of any stretching movement.
Karate is a rigorous activity. Students of karate must do constant exercises and stretching routines to limber up and strengthen the muscles of the body. Deep-breathing exercises are also useful because exhalation and sudden shouts accompany the directed blows, particularly the final or so-called killing blows. Such breathing and cries help the rhythm of the karate attack, focus more force in each blow or block, and psychologically invigorate a person while disconcerting the opponent.