question for the sprinters

[musclebosun]

I am currentley doing interval training 3 monings a week to try and increase my overall speed. My current routine is 4x400m, 4x200m, 6x50m with a work to rest ratio of 1:3
I know this sounds like a stupid question but how do you breathe over the different distances ie. fast, slow and controlled, breath holding?
advice = K

 

[eat big]

I was always told by my coaches to breathe in through the nose out through the mouth.

 

[musclebosun]

But is it more of a rapid breathing like hyperventilating or slow and controlled?

 

[|D_J^B_J|]

.

 

[coolcolj]

it should happen naturally i would think

for me its like a powerful engine needing air - suck hard