Ran across this, and while I’m not sure what it means in the context of sauna bathing, for example, I found it interesting nonetheless and wanted to save it down somewhere.
Thermal and mechanical pain thresholds in 20 episodic migraineurs, 20 chronic migraineurs, and 20 non-migraine control subjects were compared. Quantitative sensory testing was conducted when subjects had been migraine-free for at least 48 h. Heat, cold and mechanical pain thresholds, and heat and cold pain tolerance thresholds were measured. […]
Thermal pain thresholds and thermal pain tolerance thresholds differed significantly by headache group (P = 0.001). During the interictal period, episodic and chronic migraineurs were more sensitive to thermal stimulation than non-migraine controls.
CONCLUSIONS: Interictal sensitisation may predispose the migraineur to development of headaches, may be a marker of migraine activity, and a target for treatment.
(via.)
Just for reference, interictal refers to the period between headaches.