Since meditative practices are associated with changes that are consistent with decreased activity of the sympathetic nervous system1–7, it is conceivable that measurable body temperature changes accompany advanced meditative states. With the help of H.H. the Dalai Lama, we have investigated such a possibility on three practitioners of the advanced Tibetan Buddhist meditational practice known as g Tum-mo (heat) yoga living in Upper Dharamsala, India. We report here that in a study performed there in February 1981, we found that these subjects exhibited the capacity to increase the temperature of their fingers and toes by as much as 8.3°C.
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Benson, H., Lehmann, J., Malhotra, M. et al. Body temperature changes during the practice of g Tum-mo yoga. Nature 295, 234–236 (1982). https://doi.org/10.1038/295234a0
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