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Muscle Recovery and Fatigue01:24

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Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
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Related Experiment Video

Updated: Jul 24, 2025

Measuring the Motor Aspect of Cancer-Related Fatigue using a Handheld Dynamometer
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Exploring the relation between reserve and fatigue in multiple sclerosis.

Mario Tranfa1, Valentina Virginia Iuzzolino2, Pierpaolo Perrella1

  • 1Department of Advanced Biomedical Sciences, University of Naples "Federico II", Naples, Italy.

Multiple Sclerosis and Related Disorders
|July 1, 2023
PubMed
Summary

Depression, not intellectual enrichment or brain reserve, significantly impacts fatigue in multiple sclerosis (MS) patients. This study found no link between reserve indexes and fatigue levels or worsening over time.

Keywords:
DepressionFatigueMRIMultiple sclerosisReserve

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Area of Science:

  • Neurology
  • Neuroscience
  • Psychiatry

Background:

  • Multiple sclerosis (MS) is characterized by cognitive and motor disability, influenced by intellectual enrichment and brain reserve.
  • Fatigue is a prevalent and debilitating symptom in MS, yet its relationship with these reserve factors remains unexplored.

Purpose of the Study:

  • To investigate the association between intellectual enrichment, brain reserve, and fatigue in patients with multiple sclerosis (MS).
  • To determine if baseline reserve indexes can predict the onset or worsening of fatigue over a one-year period.

Main Methods:

  • Forty-eight MS patients were assessed at baseline and after one year using clinical and MRI examinations.
  • Physical and cognitive fatigue were measured using the Modified Fatigue Impact Scales (MFIS-P and MFIS-C).
  • Correlations and regression analyses explored relationships between clinico-demographic features, brain damage, reserve indexes, and fatigue levels.

Main Results:

  • At baseline, only depression significantly predicted physical and cognitive fatigue (MFIS-P and MFIS-C).
  • Changes in fatigue over time were strongly correlated with changes in depression.
  • Reserve indexes did not differ between fatigued and non-fatigued groups, nor did they predict new-onset or worsening fatigue at follow-up.

Conclusions:

  • Depression is a key factor associated with both physical and cognitive fatigue in MS patients.
  • Intellectual enrichment and brain reserve do not appear to significantly influence fatigue symptoms or their progression in this MS cohort.