The effects of caffeine and glucose on vigilance
Cardiff Metropolitan University
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Background: Research has highlighted that when caffeine and glucose are ingested together, various aspects of cognition can be improved (Adan and Serra-Grabulosa, 2010; Rao et al., 2005; Scholey and Kennedy, 2004). To date, no study has yet explicitly examined the combined and individual effects of caffeine and glucose consumption on vigilance performance using naturalistic doses. Aims: This study aimed to examine the combined and individual effects of realistic doses of caffeine and glucose consumption on cognitive vigilance task performance. Realistic doses of caffeine and glucose were used to ascertain whether effects experienced can occur in more naturalistic settings than previously used. Method: 18 undergraduate students took part in experimental, repeated measures design. Each participant attended 4 separate study trials. During each trial participants were asked to complete a cognitive vigilance task having consumed a fruit flavoured squash drink mixed with sweetener, glucose, caffeine or both caffeine and glucose. Results: There were no significant effects for number of correct responses (p>0.05). There were also no significant effects for mean reaction time (p>0.05). Conclusions: The lack of significant findings may have correctly highlighted that naturalistic doses of caffeine and glucose are not sufficient on impacting vigilance and that enhanced performance on such tasks is only observable following moderate to higher doses. Conversely, methodological issues may have impacted the findings of this study and led to a lack of significant results. Further research is required in order to address these issues adequately.
BSc (Hons) Psychology
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