Caffeine expectancies influence the subjective and behavioral effects of caffeine

Harrell, Paul T.; Juliano, Laura M.

doi:10.1007/s00213-009-1658-5

Cited by 46 publications

(80 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Lastly, all but one study failed to include measures of caffeine expectancies, which have been shown to influence the subjective and behavioral effects of caffeine. 63 Taken together, these issues inevitably introduce error variance when relating caffeine dose to outcome variables, potentially leading to inaccurate conclusions. To reduce this likelihood, caffeine diaries (i.e., normed to geographical location) could be merged with sleep-wake diaries, which could then calculate total caffeine intake, and could be used with concurrent caffeine expectancy measures (e.g., Caffeine Expectancy Questionnaire 64 ).…”

Section: Study Limitationsmentioning

confidence: 99%

Caffeine and Sleep in Adolescents: A Systematic Review

BonnarDaniel

GradisarMichael

2015

Journal of Caffeine Research

View full text Add to dashboard Cite

Sleep restriction is prevalent during adolescence and is associated with a range of adverse outcomes, including daytime, academic, physical (e.g., hypercholesterolemia), and psychological (e.g., depression) impairments. Despite possessing sleep-disrupting properties and holding a central role in the modern adolescent diet, caffeine's potential as a contributing risk factor to the development of adolescent sleep restriction remains understudied. The current systematic review identified 16 papers investigating the relationship between adolescent caffeine use and the sleep parameters of bedtime, sleep onset latency (SOL), and total sleep time (TST). In the literature, most studies found reduced TST associated with consumption of caffeine products, implicating later bedtime and/or longer SOL. However, inconsistent findings have been found in relation to bedtime and SOL. A discussion of methodological limitations present in the studies reviewed is provided, as well as directions for future research.

show abstract

Section: Study Limitationsmentioning

confidence: 99%

Caffeine and Sleep in Adolescents: A Systematic Review

BonnarDaniel

GradisarMichael

2015

Journal of Caffeine Research

View full text Add to dashboard Cite

show abstract

“…In particular, outcome expectancies, or cognitive representations of the consequences of a behavior, may contribute to the increasing CAB use and associated negative consequences. Expectancies are well known to play substantial roles in drinking behavior (Goldman, 2002; Rohsenow, 1983; Rohsenow & Lawson, 1982; Rohsenow & Marlatt, 1981) and caffeine-related behavior (Fillmore, Mulvihill, & Vogel-Sprott, 1994; Harrell & Juliano, 2009; Heinz, Kassel, & Smith, 2009). Thus, given clear evidence of a substantial role of expectancies for these drugs separately, it is highly likely that expectancies also play an important role in terms of their combination.…”

mentioning

confidence: 99%

Initial development of a measure of expectancies for combinations of alcohol and caffeine: The Caffeine + Alcohol Combined Effects Questionnaire (CACEQ).

MacKillop

Howland

Rohsenow

et al. 2012

Experimental and Clinical Psychopharmacology

View full text Add to dashboard Cite

Caffeinated alcoholic beverage (CAB) consumption is widespread among young adults in the United States and is associated with increased negative consequences from alcohol. In addition to the direct pharmacological effects of adding caffeine to alcohol, another possible risk mechanism is via socially-learned expectancies, which has received very little consideration. The current study conducted an initial psychometric validation of a measure of CAB expectancies to facilitate research in this area. Participants were 409 undergraduate regular drinkers (71% female) who were assessed for alcohol and CAB use, alcohol use/misuse, and expectancies about CABs. The majority (62%) of participants reported CAB experience and 48% reported CAB use in the past month. Participants primarily consumed spontaneously prepared as opposed to pre-mixed CABs. More frequent CAB use was significantly positively correlated with levels of alcohol use and misuse. For the expectancy items, exploratory factor analysis revealed two factors that were labeled “Intoxication Enhancement” and “Avoid Negative Consequences.” The patterns of expectancies reflected beliefs that CABs enhanced intoxication, but did not protect against negative consequences. The measure was titled the Caffeine+Alcohol Combined Effects Questionnaire (CACEQ). Intoxication enhancement scores were significantly associated with frequency of CAB use, even after adjusting for the role of weekly drinking and alcohol misuse, supporting the convergent validity of the CACEQ. These data provide initial support for the CACEQ and suggest it may be useful for clarifying the role of expectancies in CAB use. Applications for studying the risks associated with CAB use and methodological considerations are discussed.

show abstract

“…The manipulation of response expectancies (beliefs about the effects of caffeine) also changed participants' reactions (29), although sometimes in the opposite direction (i.e. stimulant instruction had a negative impact on reaction time) (14). Autonomic variables (HR, SBP, DBP) as opposed to subjective variables have usually not been influenced by verbal information about the caffeine content of the drink (12,21,36,42).…”

mentioning

confidence: 99%

Subjective and objective effects of coffee consumption — caffeine or expectations?

Dömötör¹,

Szemerszky²,

Köteles³

2015

Acta Physiologica Hungarica

View full text Add to dashboard Cite

Impact of 5 mg/kg caffeine, chance of receiving caffeine (stimulus expectancies), and expectations of effects of caffeine (response expectancies) on objective (heart rate (HR), systolic/diastolic blood pressure (SBP/DBP), measures of heart rate variability (HRV), and reaction time (RT)) and subjective variables were investigated in a double-blind, placebo-controlled experiment with a no-treatment group. Participants were 107 undergraduate university students (mean age 22.3 ± 3.96 years). Consumption of 5 mg/kg caffeine had an impact on participants' SBP, standard deviation of normal heartbeat intervals, HR (decrease), and subjective experience 40 minutes later even after controlling for respective baseline values, stimulus and response expectancies, and habitual caffeine consumption. No effects on DBP, high frequency component of HRV, the ratio of low-and high-frequency, and RT were found. Beyond actual caffeine intake, response expectancy score was also a determinant of subjective experience which refers to a placebo component in the total effect. Actual autonomic (SBP, HR) changes and somatosensory amplification tendency, however, had no significant impact on subjective experience. Placebo reaction plays a role in the subjective changes caused by caffeine consumption but it has no impact on objective variables. Conditional vs deceptive administration of caffeine (i.e. stimulus expectancies) had no impact on any assessed variable.

show abstract

Caffeine expectancies influence the subjective and behavioral effects of caffeine

Cited by 46 publications

References 28 publications

Caffeine and Sleep in Adolescents: A Systematic Review

Caffeine and Sleep in Adolescents: A Systematic Review

Initial development of a measure of expectancies for combinations of alcohol and caffeine: The Caffeine + Alcohol Combined Effects Questionnaire (CACEQ).

Subjective and objective effects of coffee consumption — caffeine or expectations?

Contact Info

Product

Resources

About