Leong_whole_thesis.pdf (4.04 MB)
The effect of alcohol and energy drink co-ingestion on objective and subjective intoxication
thesisposted on 2023-05-27, 10:48 authored by Leong, XM
Studies of the effect of alcohol mixing with energy drinks (AmED) on objective intoxication (i.e., breath alcohol concentration, BrAC%), and subjective intensity of intoxication, and experience of stimulation and sedation have shown mixed findings. A possible explanation is low ecological validity in terms of the volume and method of dose administration. The current study aimed to examine changes in objective and subjective intoxication across the intoxication curve following alcohol and EDs doses, administration using a multi-dosing method that mimics real-world drinking practices. A within-subject, placebo-controlled design was employed, where participants (N = 27, 14 males) attended two experimental sessions in counterbalanced order: alcohol with 625mL soda water (alcohol condition) or 625mL ED (AmED condition) and then had their BrAC measured and completed subjective measures of intoxication, stimulation and sedation on a regular basis. Results revealed that participants had moderate-large magnitude decreases in BrAC, subjective ratings of 'intoxication', 'impairment', 'mental fatigue' and higher 'legally ability to drive' ratings during the AmED condition as compared to ED. However, no difference in 'stimulation' and 'sedation' ratings were found between AmED and alcohol condition. Results reflecting the negative effect of AmED, where this beverage exacerbate consumers' accuracy in perceiving their intoxication level. The current study also suggests that instead of stimulation and sedation, impairments and fatigue may be stronger cues for drinkers at informing their subjective intoxication level.
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