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Effects of age on pain perception: thermonociception.

The effect of age on pain sensitivity is unclear. Some studies suggest a loss of pain perception with age, whereas other studies indicate either no change or an increase in pain sensitivity with age. The present study assessed perceived intensities of six levels of painful contact thermal stimuli (43 degrees C, 45 degrees C, 47 degrees C, 48 degrees C, 49 degrees C, and 51 degrees C). Magnitude estimation procedures were used, and participants were instructed to provide separate ratings for the perceived sensory intensity and the perceived unpleasantness (affective intensity) of the thermal stimuli during separate sessions. Middle-age adults showed the lowest sensory sensitivity and greatest affective pain ratings. Although results indicate a significant but small tendency for older adults to underrate low and overrate higher intensity contact heat compared with younger adults, similarities in pain perception were stronger than differences among the age groups.