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  4. Musculoskeletal Adaptations in Chronic Spinal Cord Injury: Effects of Long-term Soleus Electrical Stimulation Training

Musculoskeletal Adaptations in Chronic Spinal Cord Injury: Effects of Long-term Soleus Electrical Stimulation Training

Neurorehabil Neural Repair, 2007 · DOI: 10.1177/1545968306293447 · Published: January 1, 2007

Spinal Cord InjuryPhysiologyNeurology

Simple Explanation

This study explores how long-term electrical stimulation training of a paralyzed calf muscle (soleus) impacts muscle properties and bone density in individuals with chronic spinal cord injury. The research involved men with spinal cord injuries training one leg's soleus muscle with electrical stimulation for about 30 minutes a day, five days a week, over several months, while the other leg served as a control. The study found that this training improved muscle fatigue resistance and contractile work capacity, but did not significantly change bone mineral density in the tibia.

Study Duration
6 to 11 months
Participants
Four men with chronic (>2 years) complete spinal cord injury
Evidence Level
Not specified

Key Findings

  • 1
    Long-term electrical stimulation training of the paralyzed soleus muscle resulted in rapid and prolonged improvement in fatigue resistance.
  • 2
    The training also led to improvements in torque-time integral, which is an estimator of contractile work.
  • 3
    Proximal tibia bone mineral density, as measured by DEXA, did not significantly change due to the training.

Research Summary

The purpose of this study was to determine whether long-term electrical stimulation training of the paralyzed soleus muscle could change the physiological properties of the soleus and influence tibia BMD. The trained limb fatigue index, potentiation index, and torque-time integral showed rapid and robust training effects (P < .05). These findings highlight the persistent adaptive capabilities of chronically paralyzed muscle but suggest that preventing musculoskeletal adaptations after SCI may be more effective than reversing changes in the chronic condition.

Practical Implications

Rehabilitation Strategies

Electrical stimulation can be used to improve muscle properties in individuals with chronic SCI.

Long-Term Muscle Health

Long-term electrical stimulation training can sustain improvements in muscle fatigue resistance and contractile work capacity.

Bone Density Considerations

Electrical stimulation alone may not be sufficient to improve bone density in chronic SCI; other interventions may be needed.

Study Limitations

  • 1
    Small sample size
  • 2
    Lack of 3-dimensional bone densitometry
  • 3
    Isometric muscle activation conditions

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