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Atanassova DV, Madariaga VI, Oosterman JM, Brazil IA. Unpacking the relationship between Big Five personality traits and experimental pain: A systematic review and meta-analysis. Neurosci Biobehav Rev 2024; 163:105786. [PMID: 38955000 DOI: 10.1016/j.neubiorev.2024.105786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 06/21/2024] [Accepted: 06/23/2024] [Indexed: 07/04/2024]
Abstract
Pain is essential for survival, but individual responses to painful stimuli vary, representing a complex interplay between sensory, cognitive, and affective factors. Individual differences in personality traits and in pain perception covary but it is unclear which traits play the most significant role in understanding the pain experience and whether this depends on pain modality. A systematic search identified 1534 records (CINAHL, MEDLINE, PsycInfo, PubMed and Web of Science), of which 22 were retained and included in a systematic review. Only studies from the pressure pain domain (n=6) could be compared in a formal meta-analysis to evaluate the relationship between Big Five traits and experimental pain. Pressure pain tolerance correlated positively with Extraversion and negatively with Neuroticism with a trivial effect size (<0.1). While these findings suggest personality might be only weakly related to pain in healthy individuals, we emphasize the need to consider standardization, biases, and adequate sample sizes in future research, as well as additional factors that might affect experimental pain sensitivity.
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Affiliation(s)
- D V Atanassova
- Radboud University, Donders Institute for Brain, Cognition and Behavior, Nijmegen, the Netherlands.
| | - V I Madariaga
- Radboud University Medical Center, Department of Dentistry Nijmegen, the Netherlands
| | - J M Oosterman
- Radboud University, Donders Institute for Brain, Cognition and Behavior, Nijmegen, the Netherlands
| | - I A Brazil
- Radboud University, Donders Institute for Brain, Cognition and Behavior, Nijmegen, the Netherlands; Forensic Psychiatric Centre Pompestichting, Nijmegen, the Netherlands
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Pierce J, Harte SE, Afari N, Bradley CS, Griffith JW, Kim J, Lutgendorf S, Naliboff BD, Rodriguez LV, Taple BJ, Williams D, Harris RE, Schrepf A. Mediators of the association between childhood trauma and pain sensitivity in adulthood: a Multidisciplinary Approach to the Study of Chronic Pelvic Pain Research Network analysis. Pain 2023; 164:1995-2008. [PMID: 37144687 PMCID: PMC10440258 DOI: 10.1097/j.pain.0000000000002895] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 02/13/2023] [Indexed: 05/06/2023]
Abstract
ABSTRACT Urologic chronic pelvic pain syndrome (UCPPS) is a complex, debilitating condition in which patients often report nonpelvic pain in addition to localized pelvic pain. Understanding differential predictors of pelvic pain only vs widespread pain may provide novel pathways for intervention. This study leveraged baseline data from the Multidisciplinary Approach to the Study of Chronic Pelvic Pain (MAPP) Research Network's Symptom Pattern Study to investigate the impact of childhood sexual and nonsexual violent trauma on pelvic and nonpelvic pain sensitivity among adult patients with UCPPS, as well as potential mediators of this association. Study participants who met inclusion criteria for UCPPS completed questionnaires assessing childhood and recent trauma, affective distress, cognitive dysfunction, and generalized sensory sensitivity. Experimental pain sensitivity was also evaluated using standardized pressure pain applied to the pubic region and the arm. Bivariate analyses showed that childhood violent trauma was associated with more nonviolent childhood trauma, more recent trauma, poorer adult functioning, and greater pain sensitivity at the pubic region, but not pain sensitivity at the arm. Path analysis suggested that childhood violent trauma was indirectly associated with pain sensitivity at both sites and that this indirect association was primarily mediated by generalized sensory sensitivity. More experiences of recent trauma also contributed to these indirect effects. The findings suggest that, among participants with UCPPS, childhood violent trauma may be associated with heightened pain sensitivity to the extent that trauma history is associated with a subsequent increase in generalized sensory sensitivity.
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Affiliation(s)
- Jennifer Pierce
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
| | - Steven E Harte
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
| | - Niloofar Afari
- VA Center for Excellence for Stress & Mental Health and Department of Psychiatry, University of California San Diego, San Diego, CA, United States
| | - Catherine S Bradley
- Departments of Obstetrics and Gynecology and Urology, Carver College of Medicine, and Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, IA, United States
| | - James W Griffith
- Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - Jayoung Kim
- Departments of Surgery and Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Susan Lutgendorf
- Department of Psychological and Brain Sciences, Department of Urology, and Department of Obstetrics and Gynecology, University of Iowa, Iowa City, IA, United States
| | - Bruce D Naliboff
- Department of Medicine, Oppenheimer Center for Neurobiology of Stress and Resilience and Division of Digestive Diseases, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA, United States
| | - Larissa V Rodriguez
- Institute of Urology, University of Southern California, Beverly Hills, CA, United States
| | - Bayley J Taple
- Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, United States
| | - David Williams
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
| | - Richard E Harris
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
| | - Andrew Schrepf
- Department of Anesthesiology, University of Michigan, Ann Arbor, MI, United States
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Peterson JA, Lohman C, Larson RD, Bemben MG, Black CD. Lean Mass is Associated with, but Does Not Mediate Sex Differences in Pressure Pain Sensitivity in Healthy Adults. J Pain Res 2022; 15:3981-3994. [PMID: 36561645 PMCID: PMC9767032 DOI: 10.2147/jpr.s387635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Accepted: 11/12/2022] [Indexed: 12/23/2022] Open
Abstract
Background Sex differences exist in pain sensitivity, however, the underlying mechanism(s) that explain these differences are not fully understood. Pain sensitivity has been shown to be influenced by body mass index, but limited data exist on the role of body composition on pain sensitivity. The purpose was to examine the influence of body composition on pain sensitivity in males and females. Methods This cross-sectional study design used pressure pain thresholds (PPT) of 87 participants (45 female) who were assessed in the vastus lateralis (leg PPT) and brachioradialis (arm PPT) using a pressure algometer. Fat and lean tissue were assessed via dual-energy X-ray absorptiometry (DXA). A two group by two limb, repeated measured ANOVA was used to assess differences between limbs and sex. Spearman correlations and hierarchical regression analyses were employed to determine the association between body composition and PPT. Results Males had higher PPTs then females (P<0.05) and had higher DXA assessed lean and lower levels fat mass (P<0.05). Total body and limb specific lean mass was associated with PPTs (r≥0.34; P<0.05). Hierarchical regression analysis revealed lean mass was a significant predictor of 8% of the variance in arm PPT (P<0.006) and 18% of the variance in leg PPT (P<0.001). However, lean mass was not found to statistically mediate the observed sex differences in PPT. Conclusion This finding suggests lean mass may play a previously unknown role in sex differences in pressure pain sensitivity. Future studies are needed to confirm this finding and a larger sample size is likely required to have sufficient power to perform the mediation analysis.
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Affiliation(s)
- Jessica A Peterson
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA,Department of Community Dentistry and Behavioral Science, University of Florida, Gainesville, FL, USA,Pain Research and Intervention Center of Excellence, University of Florida, Gainesville, FL, USA
| | - Cameron Lohman
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA
| | - Rebecca D Larson
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA
| | - Michael G Bemben
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA
| | - Christopher D Black
- Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA,Correspondence: Christopher D Black, Department of Health and Exercise Science, University of Oklahoma, Norman, OK, 73069, USA, Tel +1 706-255-3750, Email
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Pierce J, Hassett AL, Brummett CM, McAfee J, Sieberg C, Schrepf A, Harte SE. Characterizing Pain and Generalized Sensory Sensitivity According to Trauma History Among Patients With Knee Osteoarthritis. Ann Behav Med 2021; 55:853-869. [PMID: 33377478 PMCID: PMC8382144 DOI: 10.1093/abm/kaaa105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Childhood trauma and adversity have been linked to chronic pain and pain sensitivity, particularly centralized pain. Yet, there remain numerous gaps in our understanding of this link. PURPOSE We explored the association between nonviolent and violent childhood trauma and a component of centralized pain (i.e., generalized sensory sensitivity) and pain sensitivity using self-report measures of centralized pain and quantitative sensory testing (QST). METHODS Patients scheduled for a total knee arthroplasty (n = 129) completed questionnaires and QST prior to surgery. RESULTS We found that self-report measures of centralized pain (i.e., widespread pain, somatic awareness, and sensory sensitivity) displayed a graded relationship across trauma groups, with patients with a history of violent trauma reporting the highest scores. Univariable multinomial logistic regression analyses showed that higher sensory sensitivity was associated with increased risk of being in the nonviolent trauma group compared to the no trauma group. Furthermore, higher widespread pain, higher somatic awareness, and higher sensory sensitivity distinguished the violent trauma group from the no trauma group. In multivariable analyses, sensory sensitivity is uniquely distinguished between the violent trauma group and the no trauma group. QST did not distinguish between groups. CONCLUSIONS The findings highlight the need for future research and interventions that reduce sensory sensitivity for chronic pain patients with a history of violent childhood trauma.
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Affiliation(s)
- Jennifer Pierce
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
| | - Afton L Hassett
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
| | - Chad M Brummett
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
| | - Jenna McAfee
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
| | - Christine Sieberg
- Center for Pain and the Brain, Department of Anesthesia, Critical Care, and Pain Medicine, Boston Children’s Hospital, Boston, MA, USA
- Biobehavioral Pediatric Pain Lab, Department of Psychiatry, Boston Children’s Hospital, Boston, MA, USA
- Department of Psychiatry, Harvard Medical School, Boston, MA, USA
| | - Andrew Schrepf
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
| | - Steven E Harte
- Department of Anesthesiology, University of Michigan, Back and Pain Center, Ann Arbor, MI, USA
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Hellman N, Sturycz CA, Lannon EW, Kuhn BL, Güereca YM, Toledo TA, Payne MF, Huber FA, Demuth M, Palit S, Shadlow JO, Rhudy JL. Conditioned Pain Modulation in Sexual Assault Survivors. THE JOURNAL OF PAIN 2019; 20:1027-1039. [PMID: 30825639 DOI: 10.1016/j.jpain.2019.02.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 02/12/2019] [Accepted: 02/23/2019] [Indexed: 12/20/2022]
Abstract
Sexual assault (SA) is associated with an increased risk of chronic pain, but the mechanisms for this relationship are poorly understood. To explore whether disrupted descending inhibition is involved, this study used a conditioned pain modulation task to study the inhibition of pain and the nociceptive flexion reflex (NFR; a correlate of spinal nociception) in 32 pain-free SA survivors. This group was compared with 32 pain-free, trauma-exposed persons without SA and a group of 40 pain-free persons who reported no trauma exposure. Conditioned pain modulation was assessed from painful electric stimulations (test stimulus) delivered to the ankle before, during, and after participants submerged their hand in painful 10°C water (conditioning stimulus). Pain ratings and NFR were assessed in response to test stimuli. All groups demonstrated significant inhibition of pain during conditioned pain modulation. However, only the no trauma exposure group demonstrated significant inhibition of NFR. The persons without SA group showed no inhibition of NFR, whereas the SA group showed significant facilitation of the NFR. These findings suggest that trauma exposure may impair inhibitory cerebrospinal circuits, but that SA may specifically promote facilitation of spinal nociception. Perspective: This study suggests that trauma exposure disrupts the cerebrospinal inhibition of spinal nociception, but that exposure to SA further promotes chronic pain risk by facilitating spinal nociception. This finding help may help to elucidate the pain risk mechanisms in trauma survivors.
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Affiliation(s)
| | | | | | - Bethany L Kuhn
- Department of Psychology, The University of Tulsa, Tulsa OK
| | | | - Tyler A Toledo
- Department of Psychology, The University of Tulsa, Tulsa OK
| | | | | | - Mara Demuth
- Department of Psychology, The University of Tulsa, Tulsa OK
| | - Shreela Palit
- Department of Psychology, The University of Tulsa, Tulsa OK
| | | | - Jamie L Rhudy
- Department of Psychology, The University of Tulsa, Tulsa OK.
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Trauma, attachment style, and somatization: a study of women with dyspareunia and women survivors of sexual abuse. BMC WOMENS HEALTH 2018; 18:29. [PMID: 29382322 PMCID: PMC5791220 DOI: 10.1186/s12905-018-0523-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 01/24/2018] [Indexed: 11/10/2022]
Abstract
Background Evidence points toward shared characteristics between female survivors of sexual abuse and women with dyspareunia. This study explored, for the first time, similarities and differences between women who were exposed to sexual abuse to those with dyspareunia, in order to examine whether insecure attachment styles and high somatization level are associated with trauma among women with dyspareunia. Methods Attachment styles were explored using the Experience in Close Relationships Scale to reflect participants’ levels of anxiety and avoidance. Somatization was assessed using the Brief Symptom Inventory focusing on the frequency of painful and non-painful bodily complaints. Trauma was categorized into three levels: sexual trauma, nonsexual trauma, and no trauma. Results Sexually abused (SA) women (n = 21) compared to women with dyspareunia (dys) (n = 44) exhibited insecure attachment styles, as expressed by high levels of avoidance (SA 4.10 ± 0.99 vs. dys 3.08 ± 1.04, t(61) = 2.66, p = .01) and anxiety (SA 4.29 ± 1.22 vs. dys 3.49 ± 1.04, t(61) = 3.61, p = .001), and higher somatization (21.00 ± 8.25 vs. 13.07 ± 7.57, t(59) = 3.63, p = .001). Attachment and somatization level did not differ significantly between women with dyspareunia without trauma to those with nonsexual trauma. Conclusions Our findings emphasized the unique role of sexual trauma as a contributing factor to the augmentation of perceived bodily symptoms and to insecure attachment style. This illuminates the importance of disclosing previous sexual abuse history among women with dyspareunia.
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Abstract
OBJECTIVE Sexual assault (SA) is associated with an increased risk for chronic pain and affective distress. Given that emotional processes modulate pain (e.g., negative emotions enhance pain, positive emotions inhibit pain), increased pain risk in SA survivors could stem from a disruption of emotional modulation processes. METHODS A well-validated affective picture-viewing paradigm was used to study emotional modulation of pain in 33 healthy, pain-free SA survivors and a control group of 33 healthy, pain-free individuals with no reported history of SA (matched on age, sex, race, and number of non-SA traumas). Unpleasant (mutilation), neutral, and pleasant (erotic) pictures were presented, while painful electrocutaneous stimulations were delivered at the ankle. Pain intensity ratings and nociceptive flexion reflex (NFR) magnitudes (a physiologic measure of spinal nociception) were recorded in response to electric stimuli. Multilevel models were used to analyze the data with group (SA versus non-SA) and content (mutilation, neutral, erotic) as independent variables. RESULTS Both groups demonstrated similar emotional modulation of pain (FGroupbyContent(2,646.52) = 0.44, p = .65), but a main effect of group (FGroup(1,65.42) = 4.24, p = .043) indicated the SA group experienced more overall pain from electric stimuli (hyperalgesia). A significant group by content interaction for NFR (p = .035) indicated that emotional modulation of NFR was present for the non-SA group (FContentSimpleEffect(2,684.55) = 12.43, p < .001), but not the SA group (FContentSimpleEffect(2,683.38) = 1.71, p = .18). CONCLUSIONS These findings suggest that SA survivors have difficulty emotionally engaging brain-to-spinal cord mechanisms to modulate spinal nociception. A disruption of descending inhibition plus hyperalgesia could contribute to comorbidity between sexual trauma and chronic pain.
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Sherman AL, Morris MC, Bruehl S, Westbrook TD, Walker LS. Heightened Temporal Summation of Pain in Patients with Functional Gastrointestinal Disorders and History of Trauma. Ann Behav Med 2016; 49:785-92. [PMID: 25967582 DOI: 10.1007/s12160-015-9712-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Individuals with functional gastrointestinal disorders (FGIDs) report experiencing trauma more often than healthy controls, but little is known regarding psychophysical correlates. PURPOSE The purpose of this study was to test the hypothesis that adolescents and young adults with FGIDs since childhood and a trauma history (n = 38) would exhibit heightened temporal summation to thermal pain stimuli, an index of central sensitization, and greater clinical symptoms compared to patients with FGIDs and no trauma history (n = 95) and healthy controls (n = 135). METHODS Participants completed self-report measures, an experimental pain protocol, and psychiatric diagnostic interview as part of a larger longitudinal study. RESULTS FGID + Trauma patients exhibited greater temporal summation than FGID + No Trauma patients and healthy controls. Additionally, FGID + Trauma patients exhibited greater gastrointestinal and non-gastrointestinal symptom severity, number of chronic pain sites, and disability. CONCLUSIONS Assessing for trauma history in patients with FGIDs could identify a subset at risk for greater central sensitization and pain-related symptoms.
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Affiliation(s)
- Amanda L Sherman
- Department of Psychology and Human Development, Vanderbilt University, Nashville, TN, USA
| | - Matthew C Morris
- Department of Family and Community Medicine, Meharry Medical College, Nashville, TN, USA
| | - Stephen Bruehl
- Department of Anesthesiology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | | | - Lynn S Walker
- Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, TN, USA. .,Division of Adolescent and Young Adult Health, Monroe Carell Jr. Children's Hospital at Vanderbilt, 2146 Belcourt Ave., Nashville, TN, 37212, USA.
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Altered pressure pain thresholds and increased wind-up in adult patients with chronic back pain with a history of childhood maltreatment: a quantitative sensory testing study. Pain 2016; 157:1799-1809. [DOI: 10.1097/j.pain.0000000000000586] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Levinger S, Somer E, Holden RR. The importance of mental pain and physical dissociation in youth suicidality. J Trauma Dissociation 2015; 16:322-39. [PMID: 25760400 DOI: 10.1080/15299732.2014.989644] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
This study examines the importance of two suicide risk factors, mental pain and physical dissociation, among young people. Participants were 42 suicidal inpatients, 36 nonsuicidal inpatients, and 45 nonclinical participants. Overall, suicide attempters reported a stronger intensity of and lower tolerance for mental pain and more physical dissociation compared to the other two groups. Suicide attempters with a low tolerance for mental pain showed a higher level of dissociation from pain and insensitivity to bodily cues compared to nonsuicidal inpatients with similar levels of tolerance for mental pain. Physical dissociation contributed significantly to the likelihood of suicidality beyond the contribution of mental pain. Our results accentuate the importance of the combination of mental pain and physical dissociation in suicidality. Further research on the applicability of our findings to self-injurious behavior is warranted.
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Affiliation(s)
- Shai Levinger
- a Graduate School of Creative Arts Therapies , University of Haifa , Haifa , Israel
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Biskin RS, Frankenburg FR, Fitzmaurice GM, Zanarini MC. Pain in patients with borderline personality disorder. Personal Ment Health 2014; 8:218-27. [PMID: 25044742 PMCID: PMC4129454 DOI: 10.1002/pmh.1265] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 04/13/2014] [Accepted: 05/29/2014] [Indexed: 11/10/2022]
Abstract
OBJECTIVE Patients with borderline personality disorder (BPD) frequently present to primary care physicians and specialists with pain problems. The aims of the current study are to (1) examine the prevalence of pain symptoms in patients with a diagnosis of BPD compared with a diagnosis of another personality disorder and (2) identify the factors that predict pain experienced in patients with BPD. METHODS Two hundred and ninety inpatients meeting Revised Diagnostic Interview for Borderlines and DSM-III-R criteria for BPD and 72 patients who met DSM-III-R criteria for another personality disorder were assessed at baseline using semistructured interviews and self-report measures. Ratings of pain were assessed 16 years after baseline diagnosis and compared between diagnostic groups using t-tests. Regression analyses were used to identify predictors of pain among patients with BPD. RESULTS Patients with BPD are more likely to experience pain and rate their pain as more severe than patients with other personality disorders. In multivariable regression models, there were three significant predictors of severity of pain among patients with BPD: older age, the presence of major depressive disorder, and the severity of childhood abuse other than sexual abuse. CONCLUSION Patients with BPD report significant pain, which interferes with their lives. A focus on the management of medical and psychiatric comorbidities may improve their long-term functioning.
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Affiliation(s)
- Robert S Biskin
- Department of Psychiatry, McGill University, Montreal, QC, Canada; Laboratory for the Study of Adult Development, McLean Hospital, Belmont, MA, USA
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Jones LE, O'Shaughnessy DF. The Pain and Movement Reasoning Model: Introduction to a simple tool for integrated pain assessment. ACTA ACUST UNITED AC 2014; 19:270-6. [DOI: 10.1016/j.math.2014.01.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 01/20/2014] [Accepted: 01/29/2014] [Indexed: 02/08/2023]
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Sex differences in pain and pain inhibition: multiple explanations of a controversial phenomenon. Nat Rev Neurosci 2013; 13:859-66. [PMID: 23165262 DOI: 10.1038/nrn3360] [Citation(s) in RCA: 645] [Impact Index Per Article: 58.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A clear majority of patients with chronic pain are women; however, it has been surprisingly difficult to determine whether this sex bias corresponds to actual sex differences in pain sensitivity. A survey of the currently available epidemiological and laboratory data indicates that the evidence for clinical and experimental sex differences in pain is overwhelming. Various explanations for this phenomenon have been given, ranging from experiential and sociocultural differences in pain experience between men and women to hormonally and genetically driven sex differences in brain neurochemistry.
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Lindstedt F, Karshikoff B, Schalling M, Olgart Höglund C, Ingvar M, Lekander M, Kosek E. Serotonin-1A receptor polymorphism (rs6295) associated with thermal pain perception. PLoS One 2012; 7:e43221. [PMID: 22952650 PMCID: PMC3432037 DOI: 10.1371/journal.pone.0043221] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Accepted: 07/18/2012] [Indexed: 02/08/2023] Open
Abstract
Background Serotonin (5-HT) is highly involved in pain regulation and serotonin-1A (5-HT1A) receptors are important in determining central 5-HT tone. Accordingly, variation in the 5-HT1A receptor gene (HTR1A) may contribute to inter-individual differences in human pain sensitivity. The minor G-allele of the HTR1A single nucleotide polymorphism (SNP) rs6295 attenuates firing of serotonergic neurons and reduces postsynaptic expression of the receptor. Experiments in rodents suggest that 5-HT1A-agonism modulates pain in opposite directions at mild compared to high noxious intensities. Based upon this and several other similar observations, we hypothesized that G-carriers would exhibit a relative hypoalgesia at mild thermal stimuli but tend towards hyperalgesia at higher noxious intensities. Methods Fourty-nine healthy individuals were selectively genotyped for rs6295. Heat- and cold-pain thresholds were assessed along with VAS-ratings of a range of suprathreshold noxious heat intensities (45°C–49°C). Nociceptive-flexion reflex (NFR) thresholds were also assessed. Results Volunteers did not deviate significantly from Hardy-Weinberg equilibrium. G-carriers were less sensitive to threshold-level thermal pain. This relative hypoalgesia was abolished at suprathreshold noxious intensities where G-carriers instead increased their ratings of heat-pain significantly more than C-homozygotes. No differences with regard to NFR-thresholds emerged. Conclusion/Significance To the best of our knowledge this is the first study of human pain perception on the basis of variation in HTR1A. The results illustrate the importance of including a range of stimulus intensities in assessments of pain sensitivity. In speculation, we propose that an attenuated serotonergic tone may be related to a ‘hypo- to hyperalgesic’ response-pattern. The involved mechanisms could be of clinical interest as variation in pain regulation is known to influence the risk of developing pain pathologies. Further investigations are therefore warranted.
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Affiliation(s)
- Fredrik Lindstedt
- Osher Center for Integrative Medicine, Karolinska Institutet, Stockholm, Sweden.
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