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Progressive adaptation of the soleus H-reflex with daily training at walking backward.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schneider, Cyril Capaday, Charles |
| Copyright Year | 2003 |
| Abstract | When untrained subjects walk backward on a treadmill the amplitude of the soleus H-reflex in midswing is equal to or exceeds the value in stance. This is a surprising result because during the swing phase of backward walking the soleus is inactive and its antagonist, the tibialis anterior, is active. We suggested that the high amplitude of the soleus H-reflex in late swing reflects task uncertainties, such as estimating the moment of foot contact with the ground and losing balance. In support of this idea we show that when untrained subjects held on to handrails the unexpected high-amplitude H-reflex during midswing was no longer present. We therefore asked whether daily training at this task without grasping the handrails would adaptively modify the H-reflex modulation pattern. In this event, within 10 days of training for 15 min daily, the anticipatory reflex activity at the beginning of training was gradually abated as the subjects reported gaining confidence at the task. However, when adapted subjects were made to walk backward with their eyes shut, the anticipatory reflex activity in midswing returned immediately. The reflex changes as a result of training were not due to changes in the motor activity or kinematics; they are likely part of the motor program controlling backward walking. This adaptive phenomenon may prove to be a useful model for studying the neural mechanisms of motor learning and adaptive plasticity in humans and may be relevant to rehabilitation programs for neurological patients. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://jn.physiology.org/content/jn/89/2/648.full.pdf |
| PubMed reference number | 12574442v1 |
| Volume Number | 89 |
| Issue Number | 2 |
| Journal | Journal of neurophysiology |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Abate (action) Acclimatization Ballet Cognition Disorders Depressive disorder Equilibrium Estimated Exercise Eye H-Reflex Manuscripts Motor Neuron Disease Pain Patients Physical Inactivity Physical activity Reflex Sympathetic Dystrophy Reflex action Reflex, Stretch Small Soleus muscle structure Spinal Cord Spinal Muscular Atrophy Tibialis anterior muscle structure Treadmill, device Unstable Medical Device Problem |
| Content Type | Text |
| Resource Type | Article |
