gtummo yoga, pain blocking, body tempature

heloo
im interested in gtummo yoga, the yoga that can raise the temperature of the body has this harvard medical study showed

http://www.nature.com/nature/journal/v295/n5846/abs/295234a0.html


Ive noit been able to find the methodology, could someone tell me or direct to a website with the methodology of this yoga practise?

2.
Im also interested in finding a mental control practise to block pain. Again Id be grateful for any direction. Im aware of raja yoga, butagaina no concrete methodology
Thanks