Experimental studies suggest alcohol facilitates deliberate self-harm (DSH). One explanation might be that alcohol increases pain tolerance (PT), which may then lead to DSH. This study aimed to examine whether PT mediated the relationship between alcohol and DSH. Further, alcohol is neither necessary nor sufficient to self-harm. Given past non-suicidal self-injury (NSSI) is a good predictor of future DSH, NSSI may moderate these relationships. This study also aimed to examine if mediation was conditional upon past NSSI. Participants (106 men and 104 women) reported on past NSSI and received a drink sufficient to produce target blood-alcohol content (BAC = .000%, .050%, .075%, or .100%). Participants completed a behavioral measure of DSH. Results revealed that the association between BAC and DSH was mediated through PT. Additionally, past NSSI moderated the path between PT and DSH but did not affect the path between BAC and PT. Clinical implications and limitations are discussed.

Research has shown that the experiences of pain and aggression are linked. Past research supports the notion that individuals with an aggressive history tend to have higher pain thresholds than their less aggressive counterparts. The aim of this study was to test the notion that past aggressive behavior is positively associated with higher pain tolerances, and that higher pain tolerance would be associated with the use of a clearly aggressive response on a laboratory task. Using data from a larger study on the neuroscience of human aggression (N = 80), a serial mediation model was tested using both objective and subjective indexes of pain tolerance as mediators. Results indicated that historic aggression was positively associated with both objective and subjective pain tolerance, and objective pain tolerance mediated the relationship between historic aggression and current aggression, whereas subjective pain tolerance did not.

There is a growing literature supporting the idea that those who engage in non-suicidal deliberate self-harm (DSH) have altered pain perception compared to individuals who do not. For example, individuals who report a history of non-suicidal DSH behavior have a decreased sensitivity to transient pain during laboratory-based pain induction (e.g., Glenn et al., 2014). Research suggests that brief manipulations targeting individual beliefs can affect performance on subsequent tasks, including measures of pain sensitivity. To date, however, no study has examined the effects of experimentally manipulated pain perception on DSH behavior. The Self-Aggression Paradigm (SAP: Berman & Walley, 2003; McCloskey & Berman, 2003) allows for the prospective observation of the effects of experimental manipulations on a laboratory analogue of DSH. Therefore, the aim of the current study was to determine if experimentally manipulated false feedback about pain tolerance affects DSH behavior during the SAP, thus potentially providing evidence for a causal linkage between pain perception and DSH. Eighty participants were randomly assigned to one of three feedback groups: High pain tolerance, low pain tolerance, and a control condition with neutral feedback provided after completing the SAP. Participants were provided false feedback regarding their pain tolerance after a pressure algometer task. It was predicted that participants in the high pain tolerance feedback groupwould have the highest DSH on the SAP, with DSH defined as the level of shock self-administered during a series of reaction-time trials. No significant group differences, however, emerged based on group assignment. Men engaged in more DSH than women during the study independent of feedback group assignment. A secondary aim of the current study was to provide further validation for the SAP using multiple pain induction modalities. Implications of the current findings and future research directions are discussed.

Pain is a complex, ubiquitous phenomenon that can be debilitating and costly. Although it is well known that some individuals can easily tolerate pain while others are more intolerant to pain, little is known of the neurophysiological bases of these differences. Because differences in sensory information processing may underlie variability in tolerance to pain and because measures of sensory gating are used to explore differences in sensory information processing, sensory gating among college students (N = 14) who are tolerant or intolerant to pain was investigated. This investigation explored the hypothesis that those who were more tolerant to pain would evidence greater sensory gating. Pain tolerance was first determined using a cold pressor task. Sensory gating was then determined by the amount of attenuation of the amplitude of a second painful, electrical, somatosensory stimulus (S2) in relation to the amplitude of an identical first stimulus (S1) in a paired-stimulus evoked potential (EP ) paradigm. The results obtained showed the intolerant group exhibiting greater physiological reactivity than the tolerant group, indicating that the tolerant group attained greater sensory gating than the intolerant group. / Ph. D.

The purpose of this study was to examine whether physical activity status of healthy adult males (N = 59) while in a coping strategy condition (association, disassociation, or control) influences psychophysiological responses to an acute painful stimulus. Measures of pain tolerance, state anxiety, body awareness, and salivary cortisol were investigated. Results indicated no significant differences between physical activity groups for pain tolerance, stress responses (i.e., self-reported state anxiety and cortisol levels), or body awareness. Though, those who indicated using a disassociation coping technique during the exit interview tolerated the acute, surface pain longer. More research is required to further understand the effects of physical activity and coping strategies on pain perception and psychophysiological responses.

This thesis is presented as a collection of four studies in which the role of self-control in athletic performance is examined. Considerable evidence has documented the beneficial effects of trait self-control and robust self-confidence on a wide range of behaviours. However, the relationships between these constructs have yet to be specifically explored within the sport domain. As well as exploring the trait perspective of self-control, research has employed self-control manipulations and laboratory performance to examine state self-control. The completion of tasks requiring self-control have led to impaired performance on physical tasks, also requiring self-control. But it remains unclear whether previous exertion of self-control impairs subsequent performance when self-regulation is potentially automatic, and if any observed effects are variable over different stages of performance. Building on this work, glucose supplementation, and the duration of self-control effort have been proposed as potential moderators that may influence performance effects, yet controversy exists surrounding glucose consumption, and task duration has not been appropriately considered. Furthermore, the identification of explanatory mechanisms for performance decrements following self-control use is of theoretical significance. In particular, research is yet to explore whether an individual s perceptions of pain may explain why self-control exertion interferes with subsequent performance on a physical task. The current thesis aims to address these limitations of the extant literature. Study One examined whether an individual s general ability to exert self-control might be an important mechanistic variable that explains the relationship between robust self-confidence and athletic performance. Following an examination of trait self-control, an exploration of state self-control was deemed more relevant to situational performance. Therefore, Study Two and Three utilised a sequential-task paradigm to examine whether exerting self-control impairs subsequent endurance performance in well-trained individuals, and whether any observed effects are variable over different stages of endurance performance. Study Two and Three also examined moderators of the depletion effect. In particular, the potential for glucose supplementation (Study Two), and duration of self-control effort (Study Three), to attenuate any decrements in performance due to initial self-control exertion were explored. Following the investigation of moderators, Study Four examined whether performance decrements can be explained by an individual s perceptions of pain. Overall, the findings of this thesis suggest that trait self-control represents a potentially important mechanism by which athlete s with strong robust self-confidence progress and perform successfully. Furthermore, prior exertion of self-control impairs subsequent self-regulatory efforts during well-practiced endurance performance, but these effects are variable over different stages of performance. In addition, extended self-control effort may lead to the conservation of self-control, whilst glucose supplementation does not moderate self-control ability. Finally, perceptions of pain may explain why self-control exertion interferes with subsequent performance on a physical task.

This study compared the relative efficacy of four imagery techniques in increasing tolerance to cold pressor pain. Relevant pleasant, relevant unpleasant, irrelevant pleasant, and irrelevant unpleasant imagery strategies were compared in a two-way factorial design. Prior research suggested that pleasantness and relevance both affect imagery potency. This study attempted to assess the relative contribution of these two variables to increases in pain tolerance. Also investigated were the roles of several hypothesized mediating variables; namely, contextual valence, self-efficacy, treatment credibility, and involvement in imagery. The subjects were 60 female undergraduates who were randomly assigned to the four imagery groups. Two-way analysis of covariance were performed on all dependent variables, using pain threshold as the covariate. Pearons r.'s were used to test correlational hypotheses.

M.Tech. / Purpose: A study to determine the efficacy of Traumeel® gel using phonophoresis in the treatment of a latent trapezius myofascial trigger point, with regards to pain perception, cervical spine range of motion and pressure pain tolerance.Methods: A single-blinded, controlled study design was utilised. Thirty participants who all presented with a latent trapezius myofascial trigger point were randomly divided into two groups of fifteen. Each individual was subjectively and objectively assessed from baseline values prior to receiving treatment. Group A received ultrasound utilising ultrasound gel over the trapezius myofascial trigger point, as the control group. Group B received phonophoresis with Traumeel® gel over the trapezius myofascial trigger point. All participants received two treatments per week, with a total of seven consultations, over the three week study period. The subjective data was obtained utilising a Numerical Pain Rating Scale (NPRS) whilst a hand held Algometer tested pressure pain tolerance and a Cervical Range of Motion Measuring Instrument (CROM) measured cervical spine range of motion. These were utilised to form the objective data. The Data was analysed using non-parametric tests. The two independent treatment groups were assessed for capability at treatments one, four and seven using the Mann-Whitney U-test (non-parametric version of the independent sample T-test). Changes over the three week period were observed and analyzed using the Repeated Measures test or the Friedman Test (Devey, 2010). Results: In this study ultrasound utilising ultrasound gel had a statistically significant impact on the trapezius myofascial trigger point. Statistical analysis of the Traumeel® gel suggests that there was no statistical significance with regards to any of the treatment parameters or variables measured. Subjectively ultrasound gel proved to be statistically and clinically significant in decreasing the participant’s pain perception. There was no statistical improvement but there was a clinical improvement in the Traumeel® gel group.

The first part of the thesis explored the pattern of emotional reactivity amongst individuals with Borderline Personality Disorder (BPD). A previous review (Rosenthal, Gratz, Kosson, Cheavens, Lejuez & Lynch, 2008) claimed that a discrepancy exists in the subjective versus objective patterns of responding to emotional stimuli in those with BPD. The present review assessed the reliability of such findings by reviewing a more homogenous sample of studies that had used similar methodological procedures, in addition to a range of subjective and objective measures. It also aimed to investigate psychophysiological factors associated with this proposed divergent pattern of responding. The methodological quality of all included studies was assessed. The evidence reviewed disputes claims that BPD individuals display diminished physiological reactivity, despite equal or higher self-reported emotional reactivity than controls. Instead, the present review found that individuals with BPD react more severely (both psychologically and physiologically) to experimental stimuli, than controls, particularly when the stimuli is personally-relevant. Disruption of specific brain structures involved in the regulation of emotion within the Autonomic Nervous System (ANS) are implicated in this heightened profile of emotional reactivity. Furthermore, present state dissociation acts as a defence mechanism which appears to limit cognitive processing abilities such as problem-solving, attention and concentration in those with BPD. The second part of the thesis described a randomised controlled study investigating the effects of an attention training technique on pain tolerance. The Attention Training Technique (ATT; Wells, 1990) is a brief technique used in metacognitive therapy to modify attentional control. The effect of ATT versus Progressive Muscular Relaxation (PMR) on pain tolerance was examined in a sample of individuals who had experienced early childhood trauma (N=57). Participants were randomly assigned to either the ATT condition (N = 29) or the PMR condition (N = 28). A laboratory stressor was included: The Cold Pressor Task (CPT) as an objective measure of pain tolerance. Results supported the hypothesis that ATT modified performance on the CPT. Individuals assigned to the ATT condition were able to persist significantly longer with the CPT than those in the PMR condition. Theoretical and clinical implications of the findings are discussed. Results provide preliminary evidence for the possible benefits of ATT within medical settings. The third part of the thesis critically reflected on the methodological issues and dilemmas presented by the systematic review process, as well as the methodological and ethical issues raised by the research study.

Research has shown that both optimism and gender affects how we deal with different types of pain, however, it is still unclear which factor has the greatest impact on pain perception and pain tolerance. This study examined which variable, optimism or gender, had the greatest impact on pain. This study used both a convenience and snowball sampling consisting of a total of 45 students, 21 women and 24 men aged 19-39 years old. Optimism was measured by Life Orientation Test Revised and to measure pain perception, a cold pressor task was used. The results showed no significant differences between men and women in pain perception or pain tolerance. The results did not show any difference between optimists and pessimists regarding pain perception and pain tolerance either. These findings contradicted previous research and therefore the measurement instrument reliability in this study was questioned.