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Fatigue and declines in cognitive functioning in multiple sclerosis.

L B Krupp1, L E Elkins

  • 1(Department of Neurology, State University of New York at Stony Brook, 11794-8121, USA. lkrupp@neuro.som.sunysb.edu

Neurology
|November 4, 2000
PubMed
Summary
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Individuals with multiple sclerosis (MS) experience cognitive fatigue, showing performance declines during testing unlike healthy controls. This indicates a specific vulnerability in cognitive function for those with MS.

Area of Science:

  • Neuroscience
  • Clinical Psychology

Background:

  • Multiple Sclerosis (MS) is a chronic neurological disease.
  • Cognitive impairment is a common symptom in MS, affecting daily life.
  • Cognitive fatigue, a decline in performance during sustained mental effort, is poorly understood in MS.

Purpose of the Study:

  • To investigate the presence and characteristics of cognitive fatigue in individuals with MS.
  • To compare cognitive performance changes over a single testing session between MS patients and healthy controls.

Main Methods:

  • A 4-hour cognitive testing session was administered to 45 MS patients and 14 healthy controls.
  • The session included baseline and repeat neuropsychological batteries, separated by a continuous cognitive task (mental arithmetic).
  • Self-report measures of fatigue and affect were collected throughout the session.

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Main Results:

  • MS participants demonstrated significant declines in verbal memory and conceptual planning, while controls improved.
  • Following the cognitive task, MS patients showed poorer performance on visual memory, verbal memory, and verbal fluency tests compared to controls.
  • Both groups reported increased fatigue, but cognitive performance trajectories differed significantly.

Conclusions:

  • Individuals with MS exhibit cognitive fatigue, characterized by performance decrements during sustained cognitive tasks.
  • MS patients do not show the cognitive improvements observed in healthy individuals after similar testing conditions.
  • These findings highlight a distinct pattern of cognitive performance decline in MS, underscoring the impact of cognitive fatigue.