Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined
Conditioned pain modulation (CPM) describes the reduction in pain evoked by a test stimulus (TS) when presented together with a heterotopic painful conditioning stimulus (CS). CPM has been proposed to reflect inter-individual differences in endogenous pain modulation, which may predict susceptibilit...
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MDPI AG
2021-09-01
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| Series: | Brain Sciences |
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| Online Access: | https://www.mdpi.com/2076-3425/11/9/1186 |
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| author | Philipp Graeff Alina Itter Katharina Wach Ruth Ruscheweyh |
| author_facet | Philipp Graeff Alina Itter Katharina Wach Ruth Ruscheweyh |
| author_sort | Philipp Graeff |
| collection | DOAJ |
| description | Conditioned pain modulation (CPM) describes the reduction in pain evoked by a test stimulus (TS) when presented together with a heterotopic painful conditioning stimulus (CS). CPM has been proposed to reflect inter-individual differences in endogenous pain modulation, which may predict susceptibility for acute and chronic pain. Here, we aimed to estimate the relative variance in CPM explained by inter-individual differences compared to age, sex, and CS physical and pain intensity. We constructed linear and mixed effect models on pooled data from 171 participants of several studies, of which 97 had repeated measures. Cross-sectional analyses showed no significant effect of age, sex or CS intensity. Repeated measures analyses revealed a significant effect of CS physical intensity (<i>p</i> = 0.002) but not CS pain intensity (<i>p</i> = 0.159). Variance decomposition showed that inter-individual differences accounted for 24% to 34% of the variance in CPM while age, sex, and CS intensity together explained <3% to 12%. In conclusion, the variance in CPM explained by inter-individual differences largely exceeds that of commonly considered factors such as age, sex and CS intensity. This may explain why predictive capability of these factors has had conflicting results and suggests that future models investigating them should account for inter-individual differences. |
| first_indexed | 2024-03-10T07:51:29Z |
| format | Article |
| id | doaj.art-9f25a86ea34e44bab1cd889a754dadd4 |
| institution | Directory Open Access Journal |
| issn | 2076-3425 |
| language | English |
| last_indexed | 2024-03-10T07:51:29Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Brain Sciences |
| spelling | doaj.art-9f25a86ea34e44bab1cd889a754dadd42023-11-22T12:14:22ZengMDPI AGBrain Sciences2076-34252021-09-01119118610.3390/brainsci11091186Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity CombinedPhilipp Graeff0Alina Itter1Katharina Wach2Ruth Ruscheweyh3Graduate School of Systemic Neuroscience, Ludwig-Maximilians-University Munich, 82152 Planegg, GermanyDepartment of Neurology, University Hospital Großhadern, Ludwig-Maximilians-University Munich, 81377 Munich, GermanyDepartment of Neurology, University Hospital Großhadern, Ludwig-Maximilians-University Munich, 81377 Munich, GermanyGraduate School of Systemic Neuroscience, Ludwig-Maximilians-University Munich, 82152 Planegg, GermanyConditioned pain modulation (CPM) describes the reduction in pain evoked by a test stimulus (TS) when presented together with a heterotopic painful conditioning stimulus (CS). CPM has been proposed to reflect inter-individual differences in endogenous pain modulation, which may predict susceptibility for acute and chronic pain. Here, we aimed to estimate the relative variance in CPM explained by inter-individual differences compared to age, sex, and CS physical and pain intensity. We constructed linear and mixed effect models on pooled data from 171 participants of several studies, of which 97 had repeated measures. Cross-sectional analyses showed no significant effect of age, sex or CS intensity. Repeated measures analyses revealed a significant effect of CS physical intensity (<i>p</i> = 0.002) but not CS pain intensity (<i>p</i> = 0.159). Variance decomposition showed that inter-individual differences accounted for 24% to 34% of the variance in CPM while age, sex, and CS intensity together explained <3% to 12%. In conclusion, the variance in CPM explained by inter-individual differences largely exceeds that of commonly considered factors such as age, sex and CS intensity. This may explain why predictive capability of these factors has had conflicting results and suggests that future models investigating them should account for inter-individual differences.https://www.mdpi.com/2076-3425/11/9/1186conditioned pain modulationendogenous analgesiaconditioning stimulusinterindividual factorsCPM variability |
| spellingShingle | Philipp Graeff Alina Itter Katharina Wach Ruth Ruscheweyh Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined Brain Sciences conditioned pain modulation endogenous analgesia conditioning stimulus interindividual factors CPM variability |
| title | Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined |
| title_full | Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined |
| title_fullStr | Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined |
| title_full_unstemmed | Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined |
| title_short | Inter-Individual Differences Explain More Variance in Conditioned Pain Modulation Than Age, Sex and Conditioning Stimulus Intensity Combined |
| title_sort | inter individual differences explain more variance in conditioned pain modulation than age sex and conditioning stimulus intensity combined |
| topic | conditioned pain modulation endogenous analgesia conditioning stimulus interindividual factors CPM variability |
| url | https://www.mdpi.com/2076-3425/11/9/1186 |
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