Stress Mediates the Association Between Pain and Alcohol Use in College Students

The association between pain and negative alcohol-related consequences among college students engaged in binge drinking: The moderating role of reward and relief drinking motives

Binge drinking, defined as consuming 4 or more drinks for females and 5 or more for males within a two-hour timeframe, is common among college students and associated with harmful health outcomes. Similarly, pain is prevalent in this population and can negatively affect students' psychological, social, and academic functioning. However, the limited research examining associations between pain and alcohol-related constructs among college students has yielded inconsistent results. Individual differences in levels of reward and relief drinking motives (i.e., drinking in response to positive affect/social situations versus negative affect/stressful situations) may contribute to the complex, heterogeneous nature of these associations. The aim of the present study was to examine the moderating effects of reward and relief drinking on the association between pain and alcohol-related negative consequences in college students who binge drink. Participants were 436 college students who had engaged in past-month binge drinking. Most participants identified as White (66.7 %) and female (78.2 %), with a mean age of 19.62 (SD = 1.56) years. Results revealed significant moderating effects of both reward and relief motives on the association between pain at time 1 and alcohol-related negative consequences at time 2. In participants with either higher levels of relief or lower levels of reward drinking greater pain was significantly associated with a higher number of alcohol-related negative consequences. In participants demonstrating higher levels of reward drinking, greater pain was significantly associated with a lower number of alcohol-related negative consequences. Our work indicates targeting pain as a possible intervention to prevent alcohol-related negative consequences among those who report lower levels of reward or higher levels of relief drinking.

Expectancies for Alcohol Analgesia Among Emerging Adults: Confirmatory Factor Analysis, Reliability, and Validity

BACKGROUND

Alcohol and pain frequently co-occur and interact in a positive feedback loop that maintains and exacerbates both conditions. The Expectancies for Alcohol Analgesia (EAA) is a recently developed, single-factor measure that assesses the extent to which individuals expect alcohol will reduce their pain. Alcohol-related outcome expectancies motivate drinking and predict drinking trajectories among emerging adults (18-24). The EAA was initially validated among adults with chronic pain who drink alcohol and has been associated with several indices of pain and alcohol. We are unaware of prior work that examined the psychometric properties of the EAA among emerging adults, who are at high-risk for developing positive expectancies regarding the utility of alcohol for pain management.

OBJECTIVES

The goal of this study was to examine the factor structure, reliability, and validity of the EAA among emerging adult college students.

METHODS

Emerging adult college students who endorsed lifetime alcohol use and varying pain levels (N = 555, 74.4% Female, 75.2% White) completed an online survey of pain and alcohol use.

RESULTS

Confirmatory factor analysis indicated the single-factor structure was a good fit (CFI = 0.99, TLI = 0.99, SRMR = 0.01, RMSEA = 0.04). Internal consistency was excellent (α = .95), and EAA scores were positively associated with alcohol consumption, alcohol-related consequences, drinking motives, and pain intensity and disability (ps < .01).

CONCLUSION

These findings suggest the EAA is a valid and reliable measure for assessing expectancies for alcohol analgesia among emerging adult college students, which may also be a promising intervention target to include in expectancy challenge interventions.

Pain in alcohol use disorder: Evaluating effects of childhood trauma, perceived stress, and psychological comorbidity

The relationship between pain and alcohol use disorder (AUD) is complex and bidirectional. The current study examines risk factors for pain in a large comprehensively phenotyped sample including individuals from across the spectrum of alcohol use and misuse. Participants (n = 1101) were drawn from the National Institute on Alcohol Abuse and Alcoholism Natural History Protocol and included treatment-seeking AUD inpatients (AUD+Tx, n = 369), individuals with AUD not seeking treatment (AUD+, n = 161), and individuals without AUD (AUD-, n = 571). General linear models were utilized to test the effects of AUD status, history of childhood trauma exposure, perceived stress, and psychological comorbidity on daily percent time in pain, as well as change in daily percent time in pain across the inpatient stay in AUD+Tx individuals. Overall, 60.2% individuals reported any pain, with a significantly higher prevalence in the AUD+Tx group (82.1%) compared to the AUD+ (56.5%) and AUD- (47.1%) groups. Daily percent time in pain was also highest in the AUD+Tx group (30.2%) and was further increased in those with a history of childhood abuse and comorbid posttraumatic stress disorder (PTSD). Years of heavy drinking and craving were also associated with increased percent time in pain in the AUD+Tx group. Percent time in pain decreased following acute withdrawal in the AUD+Tx group but plateaued around 25% just prior to discharge. Individuals seeking inpatient treatment for AUD, especially those with a history of childhood trauma and/or comorbid PTSD, report greater percent time in pain compared to those not seeking treatment and those without AUD. The prolonged experience of pain in abstinent AUD inpatients after the resolution of acute withdrawal may signal the early stages of protracted withdrawal. Integrative treatments targeting pain and other symptoms of protracted withdrawal may be effective in improving overall function in people with severe AUD.

Different mechanisms underlie compulsive alcohol self-administration in male and female rats

BACKGROUND

Sex is an important factor in the progression and treatment of alcohol addiction, and therapeutic approaches may have to be tailored to potential sex differences. This highlights the importance of understanding sex differences in behaviors that reflect key elements of clinical alcohol addiction, such as continued use despite negative consequences ("compulsive use"). Studies in experimental animals can help provide an understanding of the role sex plays to influence these behaviors.

METHODS

Large populations of genetically heterogeneous male and female Wistar rats were tested in an established model of compulsive alcohol self-administration, operationalized as alcohol responding despite contingent foot shock punishment. We also tested baseline (fixed ratio, unpunished) operant alcohol self-administration, motivation to self-administer alcohol (progressive ratio), and temporal discounting for alcohol reward. In search of predictors of compulsivity, animals were screened for novelty-induced place preference, anxiety-like behavior, pain sensitivity and corticosterone levels. The estrous cycle was monitored throughout the study.

RESULTS

Unpunished self-administration of alcohol did not differ between males and females when alcohol intake was corrected for body weight. Overall, females showed higher levels of compulsive responding for alcohol. Compulsive response rates showed bimodal distributions in male but not in female rats when intermediate shock intensities were used (0.2 and 0.25 mA); at higher shock intensities, responding was uniformly suppressed in both males and females. We also found less steep discounting in females when alcohol was devalued by delaying its delivery. Males exhibited a stronger motivation to obtain alcohol under unpunished conditions, while females showed higher corticosterone levels at baseline. Factor analysis showed that an underlying dimension related to stress and pain predicted compulsivity in females, while compulsivity in males was predicted by a reward factor. We did not find differences in alcohol-related behaviors throughout the various stages of the estrous cycle.

CONCLUSIONS

Our results suggest that mechanisms promoting compulsivity, a key feature of alcohol addiction, likely differ between males and females. This underscores the importance of considering sex as a biological variable in both preclinical and clinical research, and has potential treatment implications in alcohol addiction.

Alcohol use and the pain system

The World Health Organization's epidemiological data from 2016 revealed that while 57% of the global population aged 15 years or older had abstained from drinking alcohol in the previous year, more than half of the population in the Americas, Europe, and Western Pacific consumed alcohol. The spectrum of alcohol use behavior is broad: low-risk use (sensible and in moderation), at-risk use (e.g., binge drinking), harmful use (misuse) and dependence (alcoholism; addiction; alcohol use disorder). The at-risk use and misuse of alcohol is associated with the transition to dependence, as well as many damaging health outcomes and preventable causes of premature death. Recent conceptualizations of alcohol dependence posit that the subjective experience of pain may be a significant contributing factor in the transition across the spectrum of alcohol use behavior. This narrative review summarizes the effects of alcohol at all levels of the pain system. The pain system includes nociceptors as sensory indicators of potentially dangerous stimuli and tissue damage (nociception), spinal circuits mediating defensive reflexes, and most importantly, the supraspinal circuits mediating nocifensive behaviors and the perception of pain. Although the functional importance of pain is to protect from injury and further or future damage, chronic pain may emerge despite the recovery from, and absence of, biological damage (i.e., in the absence of nociception). Like other biological perceptual systems, pain is a construction contingent on sensory information and a history of individual experiences (i.e., learning and memory). Neuroadaptations and brain plasticity underlying learning and memory and other basic physiological functions can also result in pathological conditions such as chronic pain and addiction. Moreover, the negative affective/emotional aspect of pain perception provides embodied and motivational components that may play a substantial role in the transition from alcohol use to dependence.