Psychopharmacology

, Volume 157, Issue 1, pp 46–54

Glucose facilitation of cognitive performance in healthy young adults: examination of the influence of fast-duration, time of day and pre-consumption plasma glucose levels

  • Sandra I. Sünram-Lea
  • Jonathan K. Foster
  • Paula Durlach
  • Catalina Perez
Original Investigation

Abstract.

Rationale: Previous investigations have demonstrated increased performance after the administration of a glucose-load on certain aspects of cognitive functioning in healthy young adults. Generally these studies have used a procedure where participants were tested in the morning after an overnight fast. Objective: The aim of the present study was, for the first time, to investigate the glucose cognitive facilitation effect under more natural testing times and with shorter duration of the previous fast. Methods: Measures of verbal and non-verbal memory performance were compared under different fasting intervals (2-h fast versus overnight fast), times (morning versus afternoon) and glycaemic conditions (glucose versus aspartame drinks) in healthy young participants. Results: There was a significant glucose facilitation effect on long-term verbal memory performance. In addition, glucose significantly enhanced long-term spatial memory performance. The effect of glucose was essentially equivalent whether it was given after an overnight fast or a 2-h fast following breakfast or lunch. There was no effect of drink and time of day on working memory performance. Conclusions: The results of this study further support the hypothesis that glucose administration can enhance certain aspects of memory performance in healthy young adults. More significantly, the findings indicate that this cognitive facilitation effect persists under more naturalistic conditions of glucose administration and is not restricted to long fast durations or morning administration.

Glucose Short-term memory Long-term memory Verbal memory Non-verbal memory 

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Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • Sandra I. Sünram-Lea
    • 1
  • Jonathan K. Foster
    • 2
  • Paula Durlach
    • 3
  • Catalina Perez
    • 3
  1. 1.Department of Psychology, University of Manchester, Oxford Road, Manchester M13 9PL, UK
  2. 2.Department of Psychology, University of Western Australia, Perth, Western Australia 6907, Australia
  3. 3.Unilever Research Colworth Laboratory, Sharnbrook, Bedford MK44 1LQ, UK
  4. 4.Department of Psychology, Fylde College, University of Lancaster, Lancaster LA1 4YW, UK

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