The breath oxygenates the blood and pineal gland. You can also use your voice to access this energy, google Chakra Toning:
Toning is very old and basic to many traditional cultures. Much of religious chant involves toning. It consists of non-verbal conscious elongation of sounds, using the breath and voice, similar to sighing, moaning, chanting yawning and humming. It is usually started with a vowel sound such as AA, AH, EEE, II (Aye), OH OH, OOO (EWE). This is called the "seed sound" But the sound changes quickly and takes on a form of its own. It is much easier to do than to explain. It has applications for meditation, healing, musical performance, personal transformation and spiritual journeys.
Toning is more "free form" than singing. You don't have to be on key. Try and have fun with it. Any syllable or sound is OK. There is no "right" note. In a group, toners don't have to sing the same note or syllable at the same time. There is no "right" note. Any notes or sounds are OK - low or high . “All God's Critter's Got a Place in the Choir”. Toning requires no musical experience or equipment and can be done by anyone.
Chakra is a Sanskrit word meaning wheel or vortex. Toning the Chakras "tunes up" your body, mind, emotions and spirit by using the power of your own voice. There are seven chakras which are located at points along the spinal column.
1 Root-------------Uh
2 Pelvis-----------OO
3 Solar Plexus---OH
4 Heart------------AH
5 Throat-----------AYE
6 3rd eye----------EEE
7 Crown------------MMMM
There are several different chakra systems. Although there are some differences what is notable is that they are all very similar. The lower chakra's have deep sounds and the higher chakras sounds higher in pitch.
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For More Read "Journey to Kirtan" at
http://journeytokirtan.blogspot.com/