I am interested in studying all the physiological, neural, endocrine mechanisms associated with different breathing exercises suggested by traditional pranayama - such as ujjayi, bhramari, nadi suddhi, kapala bhaati, breath holding - and also other newer techniques. As part of this, I want to study how the endothelial functions change due to some of these practices. Hence, the question. I did not formally study biology or human physiology at any time. So, I have a lot of gaps in my knowledge w.r.t. human anatomy and physiology. I shall be grateful, if anyone can point me to good sources of information about the above, and also distinguished researchers who have contributed original knowledge in this field.