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The fatigue-motor performance paradox in multiple sclerosis.

Matteo Pardini1, Laura Bonzano, Luca Roccatagliata

  • 1Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoa, Genoa, Italy.

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Multiple Sclerosis (MS) patients with fatigue showed improved motor task timing, a "fatigue-motor performance paradox." This suggests fatigue may be adaptive, involving cerebellar and orbitofrontal cortex activity.

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Area of Science:

  • Neuroscience
  • Neurology
  • Rehabilitation Medicine

Background:

  • Subjective fatigue is a common and early symptom in Multiple Sclerosis (MS).
  • The link between persistent fatigue and motor task performance in MS remains poorly understood.
  • Investigating this relationship is crucial for understanding MS progression and patient well-being.

Purpose of the Study:

  • To explore the relationship between subjective fatigue and motor task performance in MS patients.
  • To examine the neuroanatomical correlates of fatigue during motor tasks using fMRI.
  • To elucidate the potential adaptive role of fatigue in motor activities.

Main Methods:

  • Quantitative assessment of a simple finger motor task.
  • Concurrent functional magnetic resonance imaging (fMRI) during task performance.
  • Inclusion of MS patients with minimal disability but significant subjective fatigue.

Main Results:

  • An unexpected positive correlation was observed between subjective fatigue and temporal accuracy in the motor task.
  • This finding reveals a "fatigue-motor performance paradox" in MS.
  • fMRI data suggested that cerebellar and orbitofrontal cortex activity mediate this association.

Conclusions:

  • Subjective fatigue in MS may be linked to enhanced, not impaired, motor performance in specific tasks.
  • Cerebellar and orbitofrontal cortex activation may play a role in the development of subjective fatigue.
  • Fatigue might serve an adaptive function, reflecting increased neural resource allocation for motor tasks in MS.