Amy Peacock | The University of New South Wales (original) (raw)

Papers by Amy Peacock

Drug and Alcohol Dependence, 2015

The Lancet Psychiatry, 2015

Drug and Alcohol Review, 2015

Despite the potential harms of mixing unregulated drugs with energy drinks (ED), research to date... more Despite the potential harms of mixing unregulated drugs with energy drinks (ED), research to date has primarily been focused on EDs co-ingested with alcohol. Consequently, the aim of the present study was to explore the rate of use, harms and correlates of EDs co-ingested with alcohol and other drugs among a sample of people who regularly use illicit stimulant drugs. Design and Methods. In 2010, 693 Australians who regularly used ecstasy completed a 1-h interview about their past six-month ED and drug use. Results. Three-quarters of the sample (77%) had recently consumed EDs with other substances, primarily alcohol (70%) and ecstasy (57%). People who consumed ED with alcohol versus those who had consumed ED with ecstasy and with alcohol (only 8% reported only consuming ED with ecstasy) had similar profiles in regards to demographics, drug use, mental health and drug-related problems. Primary motives for consuming ED with alcohol included increased alertness (59%), the taste (25%), to party for longer (23%) and to combat fatigue (16%). One-half (52%) and one-quarter (27%) of participants who consumed EDs with alcohol and with ecstasy respectively had recently experienced adverse outcomes post-consumption, primarily headaches (24% and 11%) and heart palpitations (21% and 14%). Discussion and Conclusions. Co-ingestion of EDs with licit and illicit drugs is common among people who regularly use ecstasy and related drugs. Adverse outcomes of co-ingestion suggest that targeted education regarding negative interactive drug effects is crucial for harm reduction.

Alcoholism, clinical and experimental research, 2015

Previous research on alcohol mixed with energy drinks (AmED) has shown that use is typically driv... more Previous research on alcohol mixed with energy drinks (AmED) has shown that use is typically driven by hedonistic, social, functional, and intoxication-related motives, with differential associations with alcohol-related harm across these constructs. There has been no research looking at whether there are subgroups of consumers based on patterns of motivations. Consequently, the aims were to determine the typology of motivations for AmED use among a community sample and to identify correlates of subgroup membership. In addition, we aimed to determine whether this structure of motivations applied to a university student sample. Data were used from an Australian community sample (n = 731) and an Australian university student sample (n = 594) who were identified as AmED consumers when completing an online survey about their alcohol and ED use. Participants reported their level of agreement with 14 motivations for AmED use; latent classes of AmED consumers were identified based on patte...

Alcoholism, clinical and experimental research, 2015

Emerging evidence indicates that consumers of alcohol mixed with energy drink (AmED) self-report ... more Emerging evidence indicates that consumers of alcohol mixed with energy drink (AmED) self-report lower odds of risk-taking after consuming AmED versus alcohol alone. However, these studies have been criticized for failing to control for relative frequency of AmED versus alcohol-only consumption sessions. These studies also do not account for quantity of consumption and general alcohol-related risk-taking propensity. The aims of the present study were to (i) compare rates of risk-taking in AmED versus alcohol sessions among consumers with matched frequency of use and (ii) identify consumption and person characteristics associated with risk-taking behavior in AmED sessions. Data were extracted from 2 Australian community samples and 1 New Zealand community sample of AmED consumers (n = 1,291). One-fifth (21%; n = 273) reported matched frequency of AmED and alcohol use. The majority (55%) of matched-frequency participants consumed AmED and alcohol monthly or less. The matched-frequency...

Alcoholism, clinical and experimental research, 2015

The aim of this study was to assess the relative effects of alcohol mixed with energy drink (AmED... more The aim of this study was to assess the relative effects of alcohol mixed with energy drink (AmED) versus alcohol alone on cognitive performance across the ascending and descending breath alcohol concentration (BrAC) limb using doses similar to real-world intake. Using a single-blind, placebo-controlled, crossover design, 19 participants completed 4 sessions where they received: (i) placebo, (ii) alcohol, (iii) AmED 500 ml energy drink (ED), and (iii) AmED 750 ml ED. Performance on measures of psychomotor function (Compensatory Tracking Task [CTT]), information processing (Digit Symbol Substitution Task [DSST]; Inspection Time Task [ITT]), and response inhibition (Brief Stop-Signal Task [Brief SST]) was assessed at ~0.05% ascending BrAC, ~0.08% peak BrAC, and ~0.05% descending BrAC. The ITT and Brief SST showed no differential effect of AmED versus alcohol (gs < 0.30 and gs < 0.36, respectively). Moderate magnitude improvements in alcohol-induced impairment of CTT and DSST per...

Addictive behaviors, 2015

Contrary to predictions, several studies have shown that people who consume alcohol mixed with en... more Contrary to predictions, several studies have shown that people who consume alcohol mixed with energy drinks (AmED) display low odds of risk-taking during AmED versus alcohol drinking sessions. However, these results are based on treating AmED consumers as a homogeneous group. The aim of the present study was to determine typologies of AmED risk-taking behaviour amongst consumers, as well as identifying correlates of AmED risk-taking class membership. AmED consumers (N=403) completed an online survey where they reported whether they had engaged in risk behaviours in the preceding six months during AmED and alcohol drinking sessions. Latent class models were estimated based on AmED risk-taking data; univariate multinomial logistic regression was conducted to determine correlates of class membership. A 3-class model was selected based on fit and parsimony, identifying: 1) Low risk-taking consumers (38%): low probability of any AmED risk behaviours; 2) disinhibited intake consumers (48...

Journal of psychopharmacology (Oxford, England), 2015

The cognitive impairment that results from acute alcohol intoxication is associated with consider... more The cognitive impairment that results from acute alcohol intoxication is associated with considerable safety risks. Other psychoactive substances, such as medications, pose a similar risk to road and workplace safety. However, there is currently no legal limit for operating vehicles or working while experiencing drug-related impairment. The current study sought to identify a brief cognitive task sensitive to a meaningful degree of impairment from acute alcohol intoxication to potentially stand as a reference from which to quantify impairment from other similar substances. A placebo-controlled single-blind crossover design was employed to determine the relative sensitivity of four commonly-administered cognitive tasks (Compensatory Tracking Task, Digit Symbol Substitution Test, Brief Stop Signal Task and Inspection Time Task) to alcohol-related impairment in male social drinkers at ~0.05% ascending breath alcohol concentration (BrAC), ~0.08% peak BrAC and 0.05% descending BrAC. The I...

Addictive Behaviors, 2015

To examine the prevalence, correlates and motivations for the commission of property and violent ... more To examine the prevalence, correlates and motivations for the commission of property and violent crime amongst a sample of people who inject drugs (PWID). Data were obtained from the 2013 Illicit Drug Reporting System (IDRS), which includes a cross-sectional sample of 887 PWID. Eighteen percent of PWID had committed a property offence and 3% had committed a violent offence in the month preceding interview. Opioid dependence (AOR 2.57, 95% CI 1.29-5.10) and age (AOR 0.96, 95% CI 0.93-0.99) were found to be the strongest correlates of property crime. The majority of property offenders (75%) attributed their offending to financial reasons, however those under the influence of benzodiazepines were proportionately more likely to nominate opportunistic reasons as the main motivation for their last offence. Stimulant dependence (AOR 5.34, 95% CI 1.91-14.93) was the only significant correlate of past month violent crime, and the largest proportion of violent offenders (47%) attributed their offending to opportunistic reasons. The majority of both property (71%) and violent offenders (73%) reported being under the influence of drugs the last time they committed an offence; the largest proportion of property offenders reported being under the influence of benzodiazepines (29%) and methamphetamine (24%), whilst violent offenders mostly reported being under the influence of heroin and alcohol (32% respectively). Criminal motivations, substance use and other correlates vary considerably across crime types. This suggests that crime prevention and intervention strategies need to be tailored according to individual crime types, and should take into account self-reported criminal motivations, as well as specific risk factors that have been shown to increase the likelihood of offending.

Drug and alcohol review, Jan 15, 2015

Alcohol consumption has a well-established relationship with mood, with higher positive and negat... more Alcohol consumption has a well-established relationship with mood, with higher positive and negative affect predicting alcohol use. More recently, researchers have explored whether alcohol consumption occurs as a response to affect variability as an attempt to self-medicate and stabilise affect. Studies have revealed a positive association between alcohol use and intra- and inter-individual affect variability in clinical and university student samples; however not much is known of this relationship among the general community. Ecological Momentary Assessment (EMA) methods were used to investigate the relationship between affect and arousal variability and alcohol use in 53 community volunteers. Participants self-reported affect and arousal at three to five randomly timed moments throughout the day, as well as every time they drank. On a day-to-day basis, higher positive affect was associated with increased alcohol consumption. When analyses were restricted to self-reported affect pr...

Alcohol mixed with energy drinks (AmED) is a relatively new consumption trend generating increasi... more Alcohol mixed with energy drinks (AmED) is a relatively new consumption trend generating increasing concern regarding potential adverse effects. Despite the political and health imperative, there has been no systematic and independent synthesis of the literature to determine whether or not AmED offers additional harms relative to alcohol. The aim of this study was to review the evidence about whether co-consumption of energy drinks and alcohol, relative to alcohol alone, alters: (i) physiological, psychological, cognitive and psychomotor outcomes; (ii) hazardous drinking practices; and (iii) risk-taking behaviour. Pubmed, PsycInfo and Embase databases were searched until May 2013 for papers outlining descriptive, observational analytical and human experimental studies which compared target outcomes for AmED versus alcohol consumers (between-subjects), or AmED versus alcohol consumption (within-subjects). Odds ratios were calculated for target outcomes following screening, data extraction and quality assessment. Data were extracted from 19 papers. Analyses typically revealed increased odds of self-reported stimulation-based outcomes and decreased odds of sedation-based physiological and psychological outcomes relative to when alcohol was consumed alone, as indicated by rigorous cross-sectional descriptive research. These findings typically have not been reflected in experimental research, due possibly to the low doses administered relative to typical self-reported &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;real-life&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; intake. AmED consumers generally report more hazardous alcohol consumption patterns and greater engagement in risk-taking behaviour than alcohol consumers. While most studies had equivocal findings, two studies showed lower odds of risk-taking behaviour for AmED relative to alcohol drinking sessions but limitations with respect to the outcome measures used restrict conclusions with regard to the behavioural outcomes of AmED use. Mixing alcohol with energy drinks may exert a dual effect, increasing stimulation-based effects and reducing sedation-based outcomes; the clinical severity and dose threshold has not been established. At this stage it is unclear whether these changes in the nature of intoxication translate into greater alcohol intake and risk-taking behaviour.

Psychology of Addictive Behaviors, 2013

Use of alcohol mixed with energy drinks (AmED) is an increasingly prevalent trend. However, recen... more Use of alcohol mixed with energy drinks (AmED) is an increasingly prevalent trend. However, recent research has suggested that AmED use may result in increased alcohol consumption and engagement in risk behavior postingestion. Although the majority of research has been focused on AmED use outcomes, there is a current paucity of data on the patterns of AmED use and motives for consumption. Four hundred and three participants from an Australian community sample (n ϭ 244 women) ages 18 -35 who had consumed alcohol mixed simultaneously with energy drinks (ED) in the preceding 6 months completed an online survey regarding use of EDs, alcohol, and AmED. Although AmED sessions occurred relatively infrequently compared to alcohol sessions, the alcohol and ED quantity consumed in AmED sessions was significantly greater than recommended intake. Reports of AmED use context indicated that participants typically consumed AmED while engaging in heavy drinking in public venues. However, the primary motives for AmED use related to the situational context of use, functional and hedonistic outcomes, as well as the pleasurable taste; few participants reported using AmED to increase alcohol intake, to mask intoxication, to hide alcohol's flavor, or to simulate an illicit drug "high." AmED users may be coingesting in a context and at a quantity that enhances the possibility of risky alcohol outcomes, despite predominantly consuming AmED for the taste and the functional and hedonistic outcomes. Strong endorsement of motives relating to ease of access and low cost price suggests that alcohol policy reform in relation to licensing restrictions may be necessary to minimize the risk of harm.

Psychology Learning & Teaching, 2011

Appetite, 2013

While the performance-enhancing effects of energy drinks are commonly attributed to caffeine, rec... more While the performance-enhancing effects of energy drinks are commonly attributed to caffeine, recent research has shown greater facilitation of performance postconsumption than typically expected from caffeine content alone. Consequently, the aim of the present study was to investigate the independent and combined effect of taurine and caffeine on behavioural performance, specifically reaction time. Using a doubleblind, placebo-controlled, crossover, within-subjects design, female undergraduates (N=19) completed a visual oddball task and a stimulus degradation task 45 minutes post-ingestion of capsules containing: (i) 80 mg caffeine, (ii) 1000 mg taurine, (iii) caffeine and taurine combined, and (iv) matched placebo. Participants completed each treatment condition, with sessions separated by a minimum two-day washout period.

Alcoholism: Clinical and Experimental Research, 2012

Background: The increasingly popular practice among adolescents and young adults of consuming alc... more Background: The increasingly popular practice among adolescents and young adults of consuming alcohol mixed with energy drinks (AmED) has raised concern regarding potential increases in maladaptive drinking practices, negative psychological and physiological intoxication side effects, and risky behavioral outcomes. Comparison of user types has revealed that AmED users report engaging in more risk-taking behavior relative to alcohol users. However, the comparative likelihood of risk-taking according to session type (i.e., AmED vs. alcohol session) remains relatively unknown. Thus, this study was designed with the aim of establishing the subjective physiological, psychological, and behavioral risk-taking outcomes of AmED consumption relative to alcohol consumption for AmED users drawn from the community.

Alcoholism: Clinical and Experimental Research, 2013

Alcoholism: Clinical and Experimental Research, 2013

Background: It has been argued that consuming alcohol mixed with energy drinks (AmED) causes a su... more Background: It has been argued that consuming alcohol mixed with energy drinks (AmED) causes a subjective underestimation of intoxication and an increased level of risk-taking behaviour. To date, however, there is mixed support for AmED-induced reductions in perceived intoxication, and no objective assessment of risk-taking following AmED consumption. Consequently, the present study aimed to determine the effect of alcohol and energy drink (ED) consumption on subjective measures of intoxication and objective measures of risk-taking.

Alcoholism: Clinical and Experimental Research, 2013

Drug and Alcohol Dependence, 2015

The Lancet Psychiatry, 2015

Drug and Alcohol Review, 2015

Despite the potential harms of mixing unregulated drugs with energy drinks (ED), research to date... more Despite the potential harms of mixing unregulated drugs with energy drinks (ED), research to date has primarily been focused on EDs co-ingested with alcohol. Consequently, the aim of the present study was to explore the rate of use, harms and correlates of EDs co-ingested with alcohol and other drugs among a sample of people who regularly use illicit stimulant drugs. Design and Methods. In 2010, 693 Australians who regularly used ecstasy completed a 1-h interview about their past six-month ED and drug use. Results. Three-quarters of the sample (77%) had recently consumed EDs with other substances, primarily alcohol (70%) and ecstasy (57%). People who consumed ED with alcohol versus those who had consumed ED with ecstasy and with alcohol (only 8% reported only consuming ED with ecstasy) had similar profiles in regards to demographics, drug use, mental health and drug-related problems. Primary motives for consuming ED with alcohol included increased alertness (59%), the taste (25%), to party for longer (23%) and to combat fatigue (16%). One-half (52%) and one-quarter (27%) of participants who consumed EDs with alcohol and with ecstasy respectively had recently experienced adverse outcomes post-consumption, primarily headaches (24% and 11%) and heart palpitations (21% and 14%). Discussion and Conclusions. Co-ingestion of EDs with licit and illicit drugs is common among people who regularly use ecstasy and related drugs. Adverse outcomes of co-ingestion suggest that targeted education regarding negative interactive drug effects is crucial for harm reduction.

Alcoholism, clinical and experimental research, 2015

Previous research on alcohol mixed with energy drinks (AmED) has shown that use is typically driv... more Previous research on alcohol mixed with energy drinks (AmED) has shown that use is typically driven by hedonistic, social, functional, and intoxication-related motives, with differential associations with alcohol-related harm across these constructs. There has been no research looking at whether there are subgroups of consumers based on patterns of motivations. Consequently, the aims were to determine the typology of motivations for AmED use among a community sample and to identify correlates of subgroup membership. In addition, we aimed to determine whether this structure of motivations applied to a university student sample. Data were used from an Australian community sample (n = 731) and an Australian university student sample (n = 594) who were identified as AmED consumers when completing an online survey about their alcohol and ED use. Participants reported their level of agreement with 14 motivations for AmED use; latent classes of AmED consumers were identified based on patte...

Alcoholism, clinical and experimental research, 2015

Emerging evidence indicates that consumers of alcohol mixed with energy drink (AmED) self-report ... more Emerging evidence indicates that consumers of alcohol mixed with energy drink (AmED) self-report lower odds of risk-taking after consuming AmED versus alcohol alone. However, these studies have been criticized for failing to control for relative frequency of AmED versus alcohol-only consumption sessions. These studies also do not account for quantity of consumption and general alcohol-related risk-taking propensity. The aims of the present study were to (i) compare rates of risk-taking in AmED versus alcohol sessions among consumers with matched frequency of use and (ii) identify consumption and person characteristics associated with risk-taking behavior in AmED sessions. Data were extracted from 2 Australian community samples and 1 New Zealand community sample of AmED consumers (n = 1,291). One-fifth (21%; n = 273) reported matched frequency of AmED and alcohol use. The majority (55%) of matched-frequency participants consumed AmED and alcohol monthly or less. The matched-frequency...

Alcoholism, clinical and experimental research, 2015

The aim of this study was to assess the relative effects of alcohol mixed with energy drink (AmED... more The aim of this study was to assess the relative effects of alcohol mixed with energy drink (AmED) versus alcohol alone on cognitive performance across the ascending and descending breath alcohol concentration (BrAC) limb using doses similar to real-world intake. Using a single-blind, placebo-controlled, crossover design, 19 participants completed 4 sessions where they received: (i) placebo, (ii) alcohol, (iii) AmED 500 ml energy drink (ED), and (iii) AmED 750 ml ED. Performance on measures of psychomotor function (Compensatory Tracking Task [CTT]), information processing (Digit Symbol Substitution Task [DSST]; Inspection Time Task [ITT]), and response inhibition (Brief Stop-Signal Task [Brief SST]) was assessed at ~0.05% ascending BrAC, ~0.08% peak BrAC, and ~0.05% descending BrAC. The ITT and Brief SST showed no differential effect of AmED versus alcohol (gs < 0.30 and gs < 0.36, respectively). Moderate magnitude improvements in alcohol-induced impairment of CTT and DSST per...

Addictive behaviors, 2015

Contrary to predictions, several studies have shown that people who consume alcohol mixed with en... more Contrary to predictions, several studies have shown that people who consume alcohol mixed with energy drinks (AmED) display low odds of risk-taking during AmED versus alcohol drinking sessions. However, these results are based on treating AmED consumers as a homogeneous group. The aim of the present study was to determine typologies of AmED risk-taking behaviour amongst consumers, as well as identifying correlates of AmED risk-taking class membership. AmED consumers (N=403) completed an online survey where they reported whether they had engaged in risk behaviours in the preceding six months during AmED and alcohol drinking sessions. Latent class models were estimated based on AmED risk-taking data; univariate multinomial logistic regression was conducted to determine correlates of class membership. A 3-class model was selected based on fit and parsimony, identifying: 1) Low risk-taking consumers (38%): low probability of any AmED risk behaviours; 2) disinhibited intake consumers (48...

Journal of psychopharmacology (Oxford, England), 2015

The cognitive impairment that results from acute alcohol intoxication is associated with consider... more The cognitive impairment that results from acute alcohol intoxication is associated with considerable safety risks. Other psychoactive substances, such as medications, pose a similar risk to road and workplace safety. However, there is currently no legal limit for operating vehicles or working while experiencing drug-related impairment. The current study sought to identify a brief cognitive task sensitive to a meaningful degree of impairment from acute alcohol intoxication to potentially stand as a reference from which to quantify impairment from other similar substances. A placebo-controlled single-blind crossover design was employed to determine the relative sensitivity of four commonly-administered cognitive tasks (Compensatory Tracking Task, Digit Symbol Substitution Test, Brief Stop Signal Task and Inspection Time Task) to alcohol-related impairment in male social drinkers at ~0.05% ascending breath alcohol concentration (BrAC), ~0.08% peak BrAC and 0.05% descending BrAC. The I...

Addictive Behaviors, 2015

To examine the prevalence, correlates and motivations for the commission of property and violent ... more To examine the prevalence, correlates and motivations for the commission of property and violent crime amongst a sample of people who inject drugs (PWID). Data were obtained from the 2013 Illicit Drug Reporting System (IDRS), which includes a cross-sectional sample of 887 PWID. Eighteen percent of PWID had committed a property offence and 3% had committed a violent offence in the month preceding interview. Opioid dependence (AOR 2.57, 95% CI 1.29-5.10) and age (AOR 0.96, 95% CI 0.93-0.99) were found to be the strongest correlates of property crime. The majority of property offenders (75%) attributed their offending to financial reasons, however those under the influence of benzodiazepines were proportionately more likely to nominate opportunistic reasons as the main motivation for their last offence. Stimulant dependence (AOR 5.34, 95% CI 1.91-14.93) was the only significant correlate of past month violent crime, and the largest proportion of violent offenders (47%) attributed their offending to opportunistic reasons. The majority of both property (71%) and violent offenders (73%) reported being under the influence of drugs the last time they committed an offence; the largest proportion of property offenders reported being under the influence of benzodiazepines (29%) and methamphetamine (24%), whilst violent offenders mostly reported being under the influence of heroin and alcohol (32% respectively). Criminal motivations, substance use and other correlates vary considerably across crime types. This suggests that crime prevention and intervention strategies need to be tailored according to individual crime types, and should take into account self-reported criminal motivations, as well as specific risk factors that have been shown to increase the likelihood of offending.

Drug and alcohol review, Jan 15, 2015

Alcohol consumption has a well-established relationship with mood, with higher positive and negat... more Alcohol consumption has a well-established relationship with mood, with higher positive and negative affect predicting alcohol use. More recently, researchers have explored whether alcohol consumption occurs as a response to affect variability as an attempt to self-medicate and stabilise affect. Studies have revealed a positive association between alcohol use and intra- and inter-individual affect variability in clinical and university student samples; however not much is known of this relationship among the general community. Ecological Momentary Assessment (EMA) methods were used to investigate the relationship between affect and arousal variability and alcohol use in 53 community volunteers. Participants self-reported affect and arousal at three to five randomly timed moments throughout the day, as well as every time they drank. On a day-to-day basis, higher positive affect was associated with increased alcohol consumption. When analyses were restricted to self-reported affect pr...

Alcohol mixed with energy drinks (AmED) is a relatively new consumption trend generating increasi... more Alcohol mixed with energy drinks (AmED) is a relatively new consumption trend generating increasing concern regarding potential adverse effects. Despite the political and health imperative, there has been no systematic and independent synthesis of the literature to determine whether or not AmED offers additional harms relative to alcohol. The aim of this study was to review the evidence about whether co-consumption of energy drinks and alcohol, relative to alcohol alone, alters: (i) physiological, psychological, cognitive and psychomotor outcomes; (ii) hazardous drinking practices; and (iii) risk-taking behaviour. Pubmed, PsycInfo and Embase databases were searched until May 2013 for papers outlining descriptive, observational analytical and human experimental studies which compared target outcomes for AmED versus alcohol consumers (between-subjects), or AmED versus alcohol consumption (within-subjects). Odds ratios were calculated for target outcomes following screening, data extraction and quality assessment. Data were extracted from 19 papers. Analyses typically revealed increased odds of self-reported stimulation-based outcomes and decreased odds of sedation-based physiological and psychological outcomes relative to when alcohol was consumed alone, as indicated by rigorous cross-sectional descriptive research. These findings typically have not been reflected in experimental research, due possibly to the low doses administered relative to typical self-reported &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;real-life&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39; intake. AmED consumers generally report more hazardous alcohol consumption patterns and greater engagement in risk-taking behaviour than alcohol consumers. While most studies had equivocal findings, two studies showed lower odds of risk-taking behaviour for AmED relative to alcohol drinking sessions but limitations with respect to the outcome measures used restrict conclusions with regard to the behavioural outcomes of AmED use. Mixing alcohol with energy drinks may exert a dual effect, increasing stimulation-based effects and reducing sedation-based outcomes; the clinical severity and dose threshold has not been established. At this stage it is unclear whether these changes in the nature of intoxication translate into greater alcohol intake and risk-taking behaviour.

Psychology of Addictive Behaviors, 2013

Use of alcohol mixed with energy drinks (AmED) is an increasingly prevalent trend. However, recen... more Use of alcohol mixed with energy drinks (AmED) is an increasingly prevalent trend. However, recent research has suggested that AmED use may result in increased alcohol consumption and engagement in risk behavior postingestion. Although the majority of research has been focused on AmED use outcomes, there is a current paucity of data on the patterns of AmED use and motives for consumption. Four hundred and three participants from an Australian community sample (n ϭ 244 women) ages 18 -35 who had consumed alcohol mixed simultaneously with energy drinks (ED) in the preceding 6 months completed an online survey regarding use of EDs, alcohol, and AmED. Although AmED sessions occurred relatively infrequently compared to alcohol sessions, the alcohol and ED quantity consumed in AmED sessions was significantly greater than recommended intake. Reports of AmED use context indicated that participants typically consumed AmED while engaging in heavy drinking in public venues. However, the primary motives for AmED use related to the situational context of use, functional and hedonistic outcomes, as well as the pleasurable taste; few participants reported using AmED to increase alcohol intake, to mask intoxication, to hide alcohol's flavor, or to simulate an illicit drug "high." AmED users may be coingesting in a context and at a quantity that enhances the possibility of risky alcohol outcomes, despite predominantly consuming AmED for the taste and the functional and hedonistic outcomes. Strong endorsement of motives relating to ease of access and low cost price suggests that alcohol policy reform in relation to licensing restrictions may be necessary to minimize the risk of harm.

Psychology Learning & Teaching, 2011

Appetite, 2013

While the performance-enhancing effects of energy drinks are commonly attributed to caffeine, rec... more While the performance-enhancing effects of energy drinks are commonly attributed to caffeine, recent research has shown greater facilitation of performance postconsumption than typically expected from caffeine content alone. Consequently, the aim of the present study was to investigate the independent and combined effect of taurine and caffeine on behavioural performance, specifically reaction time. Using a doubleblind, placebo-controlled, crossover, within-subjects design, female undergraduates (N=19) completed a visual oddball task and a stimulus degradation task 45 minutes post-ingestion of capsules containing: (i) 80 mg caffeine, (ii) 1000 mg taurine, (iii) caffeine and taurine combined, and (iv) matched placebo. Participants completed each treatment condition, with sessions separated by a minimum two-day washout period.

Alcoholism: Clinical and Experimental Research, 2012

Background: The increasingly popular practice among adolescents and young adults of consuming alc... more Background: The increasingly popular practice among adolescents and young adults of consuming alcohol mixed with energy drinks (AmED) has raised concern regarding potential increases in maladaptive drinking practices, negative psychological and physiological intoxication side effects, and risky behavioral outcomes. Comparison of user types has revealed that AmED users report engaging in more risk-taking behavior relative to alcohol users. However, the comparative likelihood of risk-taking according to session type (i.e., AmED vs. alcohol session) remains relatively unknown. Thus, this study was designed with the aim of establishing the subjective physiological, psychological, and behavioral risk-taking outcomes of AmED consumption relative to alcohol consumption for AmED users drawn from the community.

Alcoholism: Clinical and Experimental Research, 2013

Alcoholism: Clinical and Experimental Research, 2013

Background: It has been argued that consuming alcohol mixed with energy drinks (AmED) causes a su... more Background: It has been argued that consuming alcohol mixed with energy drinks (AmED) causes a subjective underestimation of intoxication and an increased level of risk-taking behaviour. To date, however, there is mixed support for AmED-induced reductions in perceived intoxication, and no objective assessment of risk-taking following AmED consumption. Consequently, the present study aimed to determine the effect of alcohol and energy drink (ED) consumption on subjective measures of intoxication and objective measures of risk-taking.

Alcoholism: Clinical and Experimental Research, 2013