The influence of good breathing for health, well i suppose that good breathing helps to keep good health. For the emotional part too. Many people don t notice when they are breathing in a wrong way. Clearly, when you are breathing in a wrong way, your emotions are disturbed. So with practising good breathing your emotions become clear and undisturbed.
Emotion is a movement in the body provoqued by or related to the movement of the diaphram.
When this reaction is not harmonius then the part which is not harmonius must be expressed by the movement in the body. So in a way to have emotions is always very good. The only thing is that when you are breathing in a wrong way then your diaphram is not moving correctly, so the inside movement is not harmonius, and not doing good for the body. And if emotions do good for the body that s fine, but the reality for most people is that emotion disturbes the body, that is the problem. So I cannot answer the question.