David O Kennedy

Summary

Affiliation: Northumbria University
Country: UK

Publications

  1. ncbi request reprint Vitamins and psychological functioning: a mobile phone assessment of the effects of a B vitamin complex, vitamin C and minerals on cognitive performance and subjective mood and energy
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Hum Psychopharmacol 26:338-47. 2011
  2. pmc Herbal extracts and phytochemicals: plant secondary metabolites and the enhancement of human brain function
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, School of Life Sciences, Northumbria University, Newcastle, UK
    Adv Nutr 2:32-50. 2011
  3. doi request reprint Vitamins and cognition: what is the evidence?
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Drugs 71:1957-71. 2011
  4. ncbi request reprint Monoterpenoid extract of sage (Salvia lavandulaefolia) with cholinesterase inhibiting properties improves cognitive performance and mood in healthy adults
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    J Psychopharmacol 25:1088-100. 2011
  5. ncbi request reprint Improved cognitive performance and mental fatigue following a multi-vitamin and mineral supplement with added guaranĂ¡ (Paullinia cupana)
    D O Kennedy
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Appetite 50:506-13. 2008
  6. ncbi request reprint The effects of L-theanine, caffeine and their combination on cognition and mood
    Crystal F Haskell
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Biol Psychol 77:113-22. 2008
  7. pmc Effects of high-dose B vitamin complex with vitamin C and minerals on subjective mood and performance in healthy males
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Psychopharmacology (Berl) 211:55-68. 2010
  8. doi request reprint Cognitive and mood effects of 8 weeks' supplementation with 400 mg or 1000 mg of the omega-3 essential fatty acid docosahexaenoic acid (DHA) in healthy children aged 10-12 years
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Nutr Neurosci 12:48-56. 2009
  9. doi request reprint Cognitive and mood effects in healthy children during 12 weeks' supplementation with multi-vitamin/minerals
    Crystal F Haskell
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Br J Nutr 100:1086-96. 2008
  10. ncbi request reprint Effects of Panax ginseng, consumed with and without glucose, on blood glucose levels and cognitive performance during sustained 'mentally demanding' tasks
    Jonathon L Reay
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    J Psychopharmacol 20:771-81. 2006

Collaborators

Detail Information

Publications33

  1. ncbi request reprint Vitamins and psychological functioning: a mobile phone assessment of the effects of a B vitamin complex, vitamin C and minerals on cognitive performance and subjective mood and energy
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Hum Psychopharmacol 26:338-47. 2011
    ..Despite being widely consumed, the effects of multi-vitamin supplements on psychological functioning have received little research attention...
  2. pmc Herbal extracts and phytochemicals: plant secondary metabolites and the enhancement of human brain function
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, School of Life Sciences, Northumbria University, Newcastle, UK
    Adv Nutr 2:32-50. 2011
    ..They are discussed in terms of how an increased understanding of the relationship between their ecological roles and CNS effects might further the field of natural, phytochemical drug discovery...
  3. doi request reprint Vitamins and cognition: what is the evidence?
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Drugs 71:1957-71. 2011
    ..In contrast to the literature investigating restricted ranges of vitamins, most of the evidence regarding multivitamins was collected from healthy, non-elderly samples, suggesting that more research in this population is warranted...
  4. ncbi request reprint Monoterpenoid extract of sage (Salvia lavandulaefolia) with cholinesterase inhibiting properties improves cognitive performance and mood in healthy adults
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    J Psychopharmacol 25:1088-100. 2011
    ....
  5. ncbi request reprint Improved cognitive performance and mental fatigue following a multi-vitamin and mineral supplement with added guaranĂ¡ (Paullinia cupana)
    D O Kennedy
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Appetite 50:506-13. 2008
    ....
  6. ncbi request reprint The effects of L-theanine, caffeine and their combination on cognition and mood
    Crystal F Haskell
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Biol Psychol 77:113-22. 2008
    ..These results suggest that beverages containing L-theanine and caffeine may have a different pharmacological profile to those containing caffeine alone...
  7. pmc Effects of high-dose B vitamin complex with vitamin C and minerals on subjective mood and performance in healthy males
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Psychopharmacology (Berl) 211:55-68. 2010
    ..Few studies have assessed the relationship between supplementation with vitamins/minerals and psychological functioning in healthy cohorts of non-elderly adults...
  8. doi request reprint Cognitive and mood effects of 8 weeks' supplementation with 400 mg or 1000 mg of the omega-3 essential fatty acid docosahexaenoic acid (DHA) in healthy children aged 10-12 years
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Nutr Neurosci 12:48-56. 2009
    ..Despite media and public expectation of efficacy, no study to date has investigated the cognitive and mood effects of omega 3 supplementation in healthy children...
  9. doi request reprint Cognitive and mood effects in healthy children during 12 weeks' supplementation with multi-vitamin/minerals
    Crystal F Haskell
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Br J Nutr 100:1086-96. 2008
    ..This proposition requires further investigation...
  10. ncbi request reprint Effects of Panax ginseng, consumed with and without glucose, on blood glucose levels and cognitive performance during sustained 'mentally demanding' tasks
    Jonathon L Reay
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    J Psychopharmacol 20:771-81. 2006
    ..Panax ginseng caused a reduction in blood glucose levels 1 hour following consumption when ingested without glucose. These results confirm that Panax ginseng may possess glucoregulatory properties and can enhance cognitive performance...
  11. doi request reprint Docosahexaenoic acid-rich fish oil modulates the cerebral hemodynamic response to cognitive tasks in healthy young adults
    Philippa A Jackson
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Biol Psychol 89:183-90. 2012
    ..Changes in hemodynamic response to tasks were not accompanied by consistent changes in cognitive performance...
  12. ncbi request reprint Modulation of cognitive performance following single doses of 120 mg Ginkgo biloba extract administered to healthy young volunteers
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, UK
    Hum Psychopharmacol 22:559-66. 2007
    ....
  13. ncbi request reprint Cognitive and physiological effects of an "energy drink": an evaluation of the whole drink and of glucose, caffeine and herbal flavouring fractions
    Andrew B Scholey
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Psychopharmacology (Berl) 176:320-30. 2004
    ..Both glucose and caffeine can improve aspects of cognitive performance and, in the case of caffeine, mood. There are few studies investigating the effects of the two substances in combination...
  14. ncbi request reprint Effects of cholinesterase inhibiting sage (Salvia officinalis) on mood, anxiety and performance on a psychological stressor battery
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, University of Northumbria, Newcastle upon Tyne, UK
    Neuropsychopharmacology 31:845-52. 2006
    ..The results confirm previous observations of the cholinesterase inhibiting properties of S. officinalis, and improved mood and cognitive performance following the administration of single doses to healthy young participants...
  15. ncbi request reprint Single doses of Panax ginseng (G115) reduce blood glucose levels and improve cognitive performance during sustained mental activity
    Jonathon L Reay
    Human Cognitive Neuroscience Unit, Northumbria University, Newcastle upon Tyne, UK
    J Psychopharmacol 19:357-65. 2005
    ..05). Overall these data suggest that Panax ginseng can improve performance and subjective feelings of mental fatigue during sustained mental activity. This effect may be related to the acute gluco-regulatory properties of the extract...
  16. doi request reprint Cerebral blood flow and behavioural effects of caffeine in habitual and non-habitual consumers of caffeine: a near infrared spectroscopy study
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Biol Psychol 86:298-306. 2011
    ..These findings suggest that caffeine, at levels typically found in a single dietary serving, is able to modulate cerebral blood flow but these effects are subject to tolerance...
  17. ncbi request reprint Anxiolytic effects of a combination of Melissa officinalis and Valeriana officinalis during laboratory induced stress
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Phytother Res 20:96-102. 2006
    ..As the two herbs are most often sold in combination with each other the current study assessed the anxiolytic properties of such a combination during laboratory-induced stress...
  18. ncbi request reprint Cognitive and mood improvements of caffeine in habitual consumers and habitual non-consumers of caffeine
    Crystal F Haskell
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Psychopharmacology (Berl) 179:813-25. 2005
    ..It is therefore unclear whether any beneficial findings are due to the positive effects of caffeine or to the alleviation of caffeine withdrawal...
  19. doi request reprint Effects of a multi-vitamin/mineral supplement on cognitive function and fatigue during extended multi-tasking
    Crystal F Haskell
    Brain Performance and Nutrition Research Centre, Northumbria University, Newcastle, UK
    Hum Psychopharmacol 25:448-61. 2010
    ..The current study investigated the effect of supplementation with a multi-vitamin/mineral on fatigue and cognitive function in healthy females...
  20. doi request reprint DHA-rich oil modulates the cerebral haemodynamic response to cognitive tasks in healthy young adults: a near IR spectroscopy pilot study
    Philippa A Jackson
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
    Br J Nutr 107:1093-8. 2012
    ..These encouraging pilot data warrant further application of NIRS in this area...
  21. ncbi request reprint Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (Lemon Balm)
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, University of Northumbria, Newcastle upon Tyne NE1 8ST, UK
    Psychosom Med 66:607-13. 2004
    ..Although recent research has demonstrated modulation of mood in keeping with these roles, no studies to date have directly investigated the effects of this herbal medication on laboratory-induced psychological stress...
  22. doi request reprint Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigation
    Emma L Wightman
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, United Kingdom
    Hum Psychopharmacol 27:177-86. 2012
    ..The aim of the study was to assess the effects of oral ingestion of the 'green tea' polyphenol epigallocatechin gallate (EGCG) on cognitive performance, mood and localised cerebral blood flow (CBF) parameters in healthy human adults...
  23. doi request reprint Panax ginseng has no effect on indices of glucose regulation following acute or chronic ingestion in healthy volunteers
    Jonathon L Reay
    Brain Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Br J Nutr 101:1673-8. 2009
    ..The benefits to glucose regulation associated with long-term ginseng use may only be present in populations with compromised glucose control; however, further research is needed to confirm such a speculation...
  24. doi request reprint Panax ginseng (G115) improves aspects of working memory performance and subjective ratings of calmness in healthy young adults
    Jonathon L Reay
    Brain Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, UK
    Hum Psychopharmacol 25:462-71. 2010
    ..The present study assessed the effects of Panax ginseng (G115) on subjective mood and aspects of 'working' memory processes, following a single dose and following sub-chronic (7 days) ingestion, in healthy volunteers...
  25. doi request reprint No effect of 12 weeks' supplementation with 1 g DHA-rich or EPA-rich fish oil on cognitive function or mood in healthy young adults aged 18-35 years
    Philippa A Jackson
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Br J Nutr 107:1232-43. 2012
    ..These findings, taken together with other recent reports of null effects, suggest that dietary supplementation with n-3 PUFA in healthy, normally developing and impairment-free populations is unlikely to result in cognitive enhancement...
  26. ncbi request reprint The psychopharmacology of European herbs with cognition-enhancing properties
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, NE1 8ST UK
    Curr Pharm Des 12:4613-23. 2006
    ....
  27. ncbi request reprint Blood glucose changes and memory: effects of manipulating emotionality and mental effort
    Andrew B Scholey
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
    Biol Psychol 71:12-9. 2006
    ..However, the relationship between physiological and cognitive processes associated with processing emotional material are more complex...
  28. doi request reprint Effects of resveratrol on cerebral blood flow variables and cognitive performance in humans: a double-blind, placebo-controlled, crossover investigation
    David O Kennedy
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon Tyne, United Kingdom
    Am J Clin Nutr 91:1590-7. 2010
    ..Resveratrol may therefore modulate aspects of brain function in humans...
  29. ncbi request reprint A glucose-caffeine 'energy drink' ameliorates subjective and performance deficits during prolonged cognitive demand
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, University of Northumbria, Newcastle upon Tyne, NE1 8ST, UK
    Appetite 42:331-3. 2004
    ..These results indicate that a combination of caffeine and glucose can ameliorate deficits in cognitive performance and subjective fatigue during extended periods of cognitive demand...
  30. ncbi request reprint Acute, dose-dependent cognitive effects of Ginkgo biloba, Panax ginseng and their combination in healthy young volunteers: differential interactions with cognitive demand
    Andrew B Scholey
    Human Cognitive Neuroscience Unit, Division of Psychology, University of Northumbria, Newcastle upon Tyne NE1 8ST, UK a
    Hum Psychopharmacol 17:35-44. 2002
    ..This was accompanied by improved accuracy during Serial Sevens and Serial Threes following the 640 mg and the 960 mg dose, respectively. The paper concludes with speculation into the possible mechanisms underlying these effects...
  31. ncbi request reprint A low glycaemic index breakfast cereal preferentially prevents children's cognitive performance from declining throughout the morning
    Jeanet Ingwersen
    Cognition and Communication Research Centre, Division of Psychology, University of Northumbria, Newcastle upon Tyne NE1 8ST, UK
    Appetite 49:240-4. 2007
    ..742 and -13.510, respectively, p<0.05) and secondary memory (M=-30.675 and -47.183, respectively, p<0.05)...
  32. ncbi request reprint Ginseng: potential for the enhancement of cognitive performance and mood
    David O Kennedy
    Human Cognitive Neuroscience Unit, Division of Psychology, Northumbria University, Newcastle upon Tyne, RG30 1EA, UK
    Pharmacol Biochem Behav 75:687-700. 2003
    ..It is suggested that ginseng would benefit from rigorous research further delineating its acute effects and exploring the relationship between acute effects and those seen during and following chronic administration regimens...
  33. ncbi request reprint Effects of resveratrol alone or in combination with piperine on cerebral blood flow parameters and cognitive performance in human subjects: a randomised, double-blind, placebo-controlled, cross-over investigation
    Emma L Wightman
    Brain, Performance and Nutrition Research Centre, Northumbria University, Newcastle upon TyneNE1 8ST, UK
    Br J Nutr 112:203-13. 2014
    ....