What determines cognitive functioning in the oldest-old? The EMIF-AD 90+ study

Nienke Legdeur*, Maryam Badissi, Maqsood Yaqub, Nina Beker, Carole H. Sudre, Mara Ten Kate, Mark Forrest Gordon, Gerald Novak, Frederik Barkhof, Bart N.M. Van Berckel, Henne Holstege, Majon Muller, Philip Scheltens, Andrea B. Maier, Pieter Jelle Visser

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Objectives: Determinants of cognitive functioning in individuals aged 90 years and older, the oldest-old, remain poorly understood. We aimed to establish the association of risk factors, white matter hyperintensities (WMHs), hippocampal atrophy, and amyloid aggregation with cognition in the oldest-old. Method: We included 84 individuals without cognitive impairment and 38 individuals with cognitive impairment from the EMIF-AD 90+ Study (mean age 92.4 years) and tested cross-sectional associations between risk factors (cognitive activity, physical parameters, nutritional status, inflammatory markers, and cardiovascular risk factors), brain pathology biomarkers (WMH and hippocampal volume on magnetic resonance imaging, and amyloid binding measured with positron emission tomography), and cognition. Additionally, we tested whether the brain pathology biomarkers were independently associated with cognition. When applicable, we tested whether the effect of risk factors on cognition was mediated by brain pathology. Results: Lower values for handgrip strength, Short Physical Performance Battery (SPPB), nutritional status, HbA1c, and hippocampal volume, and higher values for WMH volume and amyloid binding were associated with worse cognition. Higher past cognitive activity and lower body mass index were associated with increased amyloid binding, lower muscle mass with more WMH, and lower SPPB scores with more WMH and hippocampal atrophy. The brain pathology markers were independently associated with cognition. The association of SPPB with cognition was partially mediated by hippocampal volume. Discussion: In the oldest-old, physical parameters, nutritional status, HbA1c, WMH, hippocampal atrophy, and amyloid binding are associated with cognitive impairment. Physical performance may affect cognition through hippocampal atrophy. This study highlights the importance to consider multiple factors when assessing cognition in the oldest-old.

Original languageEnglish
Pages (from-to)1499-1511
Number of pages13
JournalJournals of Gerontology - Series B Psychological Sciences and Social Sciences
Volume76
Issue number8
Early online date8 Sep 2020
DOIs
Publication statusPublished - Oct 2021

Bibliographical note

Funding Information:
This work was supported by the EU/EFPIA Innovative Medicines Initiative Joint Undertaking EMIF grant agreement no. 115372. F. Barkhof is supported by the NIHR Biomedical Research Centre at UCLH. C. H. Sudre is supported by an Alzheimer's Society Junior Fellowship (AS-JF-17-011).

Publisher Copyright:
© 2020 The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • Alzheimer's disease
  • Brain pathology biomarkers
  • Cognitive aging
  • Oldest-old
  • Risk factors

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