Extreme example: http://en.wikipedia.org/wiki/Wim_Hof (climbed Kilimanjaro, completed a marathon above the Polar circle, attempted to climb Everest, all dressed in nothing but shorts; claims that Tibetan meditation helps him)
Oh, wow - I had no idea! Thanks for pointing this out.
The scientific experiments with him are published now.
Kox et al, 2011
The Influence of Concentration/Meditation on Autonomic Nervous System Activity and the Innate Immune Response: A Case Study
in Psychosomatic Medicine
