Effects of two doses of glucose and a caffeine-glucose combination on cognitive performance and mood during multi-tasking.
Bottom Line: There were no significant treatment effects on mood.These data suggest that co-administration of glucose and caffeine allows greater allocation of attentional resources than placebo or glucose alone.At present, we cannot rule out the possibility that the effects are due to caffeine alone Future studies should aim at disentangling caffeine and glucose effects.
Affiliation: Centre for Human Psychopharmacology, Swinburne University, Melbourne, VIC, Australia.Show MeSH
Mentions: There was a significant time × condition interaction for blood glucose levels [F(6, 292) = 20.68, p < 0.001]. Blood glucose levels did not differ at baseline [F(3, 146) = 0.91, p = 0.438]. There were significant group differences at both at the 30-min (pre-task) [F(3, 146) = 25.48, p < 0.001] and 60-min (post-task) [F(3, 146) = 27.21, p < 0.001] time points. Pairwise comparisons revealed that all measures were significantly higher than placebo at both post-baseline time points (p < 0.005) and that the 25 g drink was associated with lower blood glucose levels than the caffeine–glucose drink at the pre-task measure (p = 0.038) and both the 60 g drink and the caffeine–glucose drink at the post-test measure (p < 0.005 in both cases). These data are plotted in Figure 2 (upper panel).
Affiliation: Centre for Human Psychopharmacology, Swinburne University, Melbourne, VIC, Australia.