Cognitive Processing Speed and Fatigue in People with Multiple Sclerosis

In a study of 34 people with multiple sclerosis (PwMS) and 32 healthy controls (HCs), PwMS experienced higher long-term fatigue and slower cognitive processing speed (CPS). After adjusting cognitive tasks to individual CPS, markers of fatigability in PwMS aligned with HCs, but perceived fatigue remained high. CPS and long-term fatigue correlated with brain changes, while fatigability did not.

Tags: #MSResearch
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Source: Read original source (PMID 42806770)

This plain-English summary was written by AI from a published abstract and may contain errors. It is not medical advice. Read the original study and talk to your MS team before making decisions about treatment.

Why it matters

Understanding the different facets of fatigue, including long-term fatigue versus task-induced fatigability, could help in developing targeted interventions for PwMS, as fatigue is a major challenge in this population.

What this does not prove

The study does not establish causality between CPS and fatigue. Additionally, the sample size is relatively small, which may limit the generalizability of the findings.

Next milestone

No next milestone was established from the available source.

Study facts

Study design: Observational
Participants / samples: Not reported
Randomised: Not reported
Controlled: Not reported
Primary endpoint met: Yes
Relevant MS type: All
Publication date: Not reported
Evidence reviewed: Abstract only
Regulatory approval: Not reported
Research areas: Not classified

Original sources

Primary evidenceDissociating Fatigue and Fatigability in Multiple Sclerosis: The Role of Cognitive Processing Speed. ↗DOI: 10.1111/ene.70769

Supporting passages (8)

study designThis study aimed to clarify the distinction between long-term fatigue and task-induced fatigability and their respective pathophysiological processes, and to examine the contribution of decreased cognitive processing speed (CPS) to the relationship between structural brain damage, fatigue, and fatigability.

subjectsMETHODS: Fatigue was induced in 34 PwMS (18-49 years) and 32 age-/sex-matched healthy controls (HCs, 24-44 years) using an individually calibrated task based on each participant's CPS.

sample size basisMETHODS: Fatigue was induced in 34 PwMS (18-49 years) and 32 age-/sex-matched healthy controls (HCs, 24-44 years) using an individually calibrated task based on each participant's CPS.

primary endpoint metOnce cognitive load was calibrated to individual CPS, objective markers of fatigability (performance, vigilance, pupil changes) no longer differed from HCs (all p > 0.05), whereas perceived task-induced fatigue remained elevated.

relevant ms typesBACKGROUND: Fatigue in people with multiple sclerosis (PwMS) is common and disabling, yet poorly understood.

primary endpointPerceived task-induced fatigue was assessed from pre- to post-task change in self-reported fatigue, and objective fatigability from within-task changes in performance, vigilance, and pupil diameter.

findingsBoth CPS and long-term fatigue-but not fatigability-were associated with putamen atrophy and lesion burden.

limitationsThis study aimed to clarify the distinction between long-term fatigue and task-induced fatigability and their respective pathophysiological processes, and to examine the contribution of decreased cognitive processing speed (CPS) to the relationship between structural brain damage, fatigue, and fatigability.

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