Glucose administration and cognitive function : differential effects of age and effort during a dual task paradigm in younger and older adults

Macpherson, Helen and Robertson, Bernadette and Sünram-Lea, Sandra-Ilona and Stough, Con and Kennedy, David and Scholey, Andrew B. (2015) Glucose administration and cognitive function : differential effects of age and effort during a dual task paradigm in younger and older adults. Psychopharmacology, 232 (6). pp. 1135-1142. ISSN 0033-3158

Abstract

Rationale Current research suggests that glucose facilitates performance on cognitive tasks which possess an episodic memory component and a relatively high level of cognitive demand. However, the extent to which this glucose facilitation effect is uniform across the lifespan is uncertain. Methods This study was a repeated measures, randomised, placebo-controlled, cross-over trial designed to assess the cogni- tive effects of glucose in younger and older adults under single and dual task conditions. Participants were 24 healthy younger (average age 20.6 years) and 24 healthy older adults (average age 72.5 years). They completed a recognition memory task after consuming drinks containing 25 g glucose and a placebo drink, both in the presence and absence of a secondary tracking task. Results and conclusions Glucose enhanced recognition mem- ory response time and tracking precision during the secondary task, in older adults only. These findings do not support pref- erential targeting of hippocampal function by glucose, rather they suggest that glucose administration differentially increases the availability of attentional resources in older individuals.