RESTING BLOOD-PRESSURE AND THERMAL PAIN RESPONSES AMONG FEMALES - EFFECTS ON PAIN UNPLEASANTNESS BUT NOT PAIN INTENSITY

In order to investigate the influence of resting blood pressure on the rmal pain responses among females, this experiment studied 21 pain-fre e, normotensive females (mean age 23) classified as having high (HBP) vs. low blood pressure (LBP) based on a median split of resting blood pressure collected prior to thermal testing. All subjects then underwe nt thermal pain testing, including determination of pain threshold and tolerance followed by verbal descriptor ratings of the intensity and unpleasantness of suprathreshold thermal stimuli, ranging from 45 to 4 9 degrees C. Thermal stimuli were delivered to the volar forearm and t he ipsilateral face using a 1 cm(2) contact thermode. Results indicate d that the blood pressure groups did not differ in thermal pain thresh old or tolerance or on ratings of the intensity of suprathreshold ther mal stimuli. However, the HBP group provided significantly lower ratin gs of thermal pain unpleasantness than the LBP group (P < 0.01). These data indicate that resting blood pressure is inversely associated wit h pain sensitivity among females, but this relationship may be selecti ve for the affective component of pain. (C) 1998 Elsevier Science B.V. All rights reserved.