Figure 2.

Non-tested palm. Average temperatures (ordinate) for the left and right palmar surfaces of control subjects and IBS patients at 3 time points (abscissa). Compared to the resting level (time 1), 5 minutes of pain testing for control subjects significantly reduced skin temperature (time 2), with some recovery by 3 minutes (time 3). Resting skin temperatures did not differ significantly for IBS and controls subjects. A significant decrease in skin temperature was not produced by pain testing of IBS patients.