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Related Experiment Video

Updated: Sep 12, 2025

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Arterial stiffness moderates the link between NfL and cognition: The IGNITE study.

Amani M Norling1,2, Lewis A Lipsitz1,2, Alyssa B Dufour1,2

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Summary

Higher arterial stiffness amplifies the negative impact of neurofilament light on cognitive function in older adults. This suggests vascular aging may worsen neuroaxonal degeneration-related cognitive decline.

Keywords:
cardiorespiratory fitnesscognitive agingepisodic memoryneurofilament lightolder adultspulse wave velocityvascular healthworking memory

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Area of Science:

  • Neuroscience
  • Gerontology
  • Cardiovascular Medicine

Background:

  • Arterial stiffness, measured by carotid-femoral pulse wave velocity (cfPWV), and plasma neurofilament light (NfL) are indicators of vascular and neuroaxonal aging, respectively.
  • Both cfPWV and NfL are independently associated with cognitive decline in older adults.
  • The potential synergistic effect of cfPWV on the relationship between NfL and cognitive function remains largely unexplored.

Purpose of the Study:

  • To investigate whether higher cfPWV exacerbates the association between NfL levels and cognitive performance in cognitively unimpaired older adults.
  • To explore the combined impact of vascular aging and neuroaxonal degeneration markers on cognitive function.

Main Methods:

  • Cross-sectional study of 570 cognitively unimpaired older adults.
  • Cognitive function assessed using composite scores derived from confirmatory factor analysis.
  • Carotid-femoral pulse wave velocity (cfPWV) dichotomized at the median.
  • Plasma NfL levels quantified using Single Molecule Array (Simoa) technology.

Main Results:

  • Elevated NfL levels correlated with poorer performance across all cognitive domains.
  • Higher cfPWV was associated with diminished episodic memory, working memory, and processing speed.
  • Significant interactions between NfL and cfPWV were observed for episodic and working memory, indicating that higher cfPWV amplified the negative effects of NfL on these cognitive domains.

Conclusions:

  • Increased arterial stiffness significantly amplifies the detrimental association between NfL-related axonal degeneration and cognitive decline.
  • Findings highlight a synergistic interplay between vascular aging (cfPWV) and neurodegenerative markers (NfL) in predicting cognitive function.
  • Evaluating NfL or cfPWV in isolation may underestimate their combined impact on age-related cognitive impairment.