2002 Fiscal Year Final Research Report Summary
International Comparative Study on Pain Cognition and Pain Sensitivity in the Orofacial Region
Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants |
|Research Institution||OKAYAMA UNIVERSITY |
YATANI Hirofumi Okayama Univ., Grad. schl. of Med. and Dent., Professor -> 岡山大学, 大学院・医歯学総合研究科, 教授 (80174530)
MAEKAWA Kenji Okayama Univ., Grad. schl. of Med. and Dent., Assoc. Prof., 大学院・医歯学総合研究科, 講師 (20304313)
|Project Period (FY)
2001 – 2002
|Keywords||Perception threshold / Pain threshold / gender difference / laterality / Hot stimulation / Cold stimulation / Current stimulation / CPT|
The purpose of this study was to compare of the pain threshold in the trigeminal nerve region between healthy male and female volunteers.
1. Measurements of current perception and pain thresholds in the trigeminal nerve region
1) The test-retest reliability of current perception threshold measurements
Intra-class correlations for the trigeminal nerve following 2,000, 250, and 5 Hz stimulation were 0.62, 0.80, and 0.86, respectively. Reliability was therefore favorable for all three frequencies.
2) Gender differences of current perception and pain thresholds
Irrespective of stimulation frequencies, the current perception threshold was significantly lower in females than in males, whereas the mean current pain threshold was lower, but not significant, in females than in males.
2. Measurements of thermal perception and pain thresholds in the trigeminal nerve region
1) Gender differences of perception threshold for hot and cold stimuli
The mean perception thresholds for hot and cold stimuli were lower in females than in males but the gender differences were not significant. Since the p-values were slightly bigger than 0.05, it is anticipated the differences would be significant in bigger samples.
2) Gender differences of pain threshold for hot and cold stimuli
There were no gender differences in pain threshold for hot and cold stimuli.
These results suggest that, compared to healthy-males, healthy females are more sensitive to tactile or pressure sensations, and that the gender differences on the pain threshold with pain-related nerve fibers such as A δ and C fibers can be ignored. The gender difference of patient population with orofacial pain might be explained by not the peripheral mechanism, but the central mechanism of pain perception.
Research Products (2 results)