Alterations in cerebral metabolic rate and blood supply across the adult lifespan

Hanzhang Lu, Feng Xu, Karen M. Rodrigue, Kristen M. Kennedy, Yamei Cheng, Blair Flicker, Andrew C. Hebrank, Jinsoo Uh, Denise C. Park

Research output: Contribution to journalArticle

Abstract

With age, the brain undergoes comprehensive changes in its function and physiology. Cerebral metabolism and blood supply are among the key physiologic processes supporting the daily function of the brain and may play an important role in age-related cognitive decline. Using MRI, it is now possible to make quantitative assessment of these parameters in a noninvasive manner. In the present study, we concurrently measured cerebral metabolic rate of oxygen (CMRO2), cerebral blood flow (CBF), and venous blood oxygenation in a well-characterized healthy adult cohort from 20 to 89 years old (N = 232). Our data showed that CMRO2 increased significantly with age, while CBF decreased with age. This combination of higher demand and diminished supply resulted in a reduction of venous blood oxygenation with age. Regional CBF was also determined, and it was found that the spatial pattern of CBF decline was heterogeneous across the brain with prefrontal cortex, insular cortex, and caudate being the most affected regions. Aside from the resting state parameters, the blood vessels' ability to dilate, measured by cerebrovascular reactivity to 5% CO2 inhalation, was assessed and was reduced with age, the extent of which was more prominent than that of the resting state CBF.

Original languageEnglish (US)
Pages (from-to)1426-1434
Number of pages9
JournalCerebral Cortex
Volume21
Issue number6
DOIs
StatePublished - Jun 2011
Externally publishedYes

Keywords

  • MRI
  • aging
  • blood oxygenation
  • cerebral blood flow
  • cerebral metabolism
  • cerebrovascular reactivity

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

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  • Cite this

    Lu, H., Xu, F., Rodrigue, K. M., Kennedy, K. M., Cheng, Y., Flicker, B., Hebrank, A. C., Uh, J., & Park, D. C. (2011). Alterations in cerebral metabolic rate and blood supply across the adult lifespan. Cerebral Cortex, 21(6), 1426-1434. https://doi.org/10.1093/cercor/bhq224