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Soleus motor neuron excitability before and after standing
1Graduate Program in Physical Therapy & Rehabilitation Science, The University of Iowa, Iowa City, Iowa 52242-1190, USA.
Electromyography and Clinical Neurophysiology
|September 24, 2004
Summary
Standing does not significantly alter soleus motor neuron excitability in able-bodied individuals. H-reflex measurements before and after a standing protocol showed high reproducibility, supporting its use for spinal cord injury research.
Area of Science:
- Neuroscience
- Motor Control
- Human Physiology
Background:
- H-reflexes are a standard method to evaluate motor neuronal pool excitability.
- Understanding postural effects on motor control is crucial for rehabilitation.
Purpose of the Study:
- To investigate if a standing protocol affects soleus motor neuron pool excitability in able-bodied individuals.
- To assess the reproducibility of H-reflex measurements after a standing intervention.
Main Methods:
- Soleus H-reflex recruitment curves were measured in a seated position before and after a 22-minute standing protocol.
- Participants were healthy individuals (n=10).
- The standing protocol combined active and passive upright standing.
Main Results:
- No systematic changes in maximum M-wave and H-reflex amplitudes were observed post-standing.
- High intraclass correlation coefficients (ICC = 0.99 and 0.96) indicated strong agreement in H-reflex and M-wave measurements.
- H-reflexes were reproducible, suggesting minimal lasting effects of the standing protocol.
Conclusions:
- The standing protocol did not induce lasting changes in motor neuronal pool excitability.
- H-reflex measurements are reliable for assessing the impact of interventions like electrically induced standing.
- This methodology is suitable for future studies on spinal cord injury patients.