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Exercise-Induced Brain Excitability Changes in Progressive Multiple Sclerosis: A Pilot Study.

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This summary is machine-generated.

Aerobic exercise can improve brain function in people with progressive multiple sclerosis (MS). Even with significant disability, exercise boosts neuroplasticity, but fitness and body fat influence the benefits.

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Rehabilitation Science

Background:

  • Aerobic exercise (AE) typically enhances corticospinal excitability (CSE), a marker of neuroplasticity.
  • Neurodegenerative conditions like progressive multiple sclerosis (MS) may impair the brain's capacity for neuroplasticity.
  • The impact of AE on CSE in individuals with progressive MS is largely unknown.

Purpose of the Study:

  • To investigate whether a single bout of AE can induce changes in CSE in individuals with progressive MS.
  • To explore the relationship between physical characteristics (fitness, body fat) and exercise-induced neuroplasticity in this population.

Main Methods:

  • Ten individuals with progressive MS, using assistive devices, underwent a graded maximal exercise test.
  • CSE was assessed using transcranial magnetic stimulation before and after a 40-minute moderate-intensity AE session.
  • Measurements included motor thresholds, motor evoked potential amplitudes, recruitment curves, and cortical silent period.

Main Results:

  • Aerobic exercise led to reduced inhibition (shorter CSP) and increased excitation (higher MEP amplitude) in the hemisphere of the dominant hand.
  • Higher cardiorespiratory fitness predicted greater exercise-induced reduction in resting motor threshold.
  • Lower body fat significantly predicted a greater exercise-induced reduction in the cortical silent period.

Conclusions:

  • Individuals with progressive MS retain the capacity for exercise-induced neuroplasticity, even with substantial disability.
  • The hemisphere contralateral to the non-dominant hand showed resistance to exercise-induced CSE changes, indicating reduced neuroplastic potential.
  • Interventions to improve fitness and reduce body fat may enhance the neuroplastic benefits of exercise in progressive MS.