The action of plantar pressure on flexion reflex pathways in the isolated human spinal cord

B.A. Conway, M. Knikou

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    To investigate the conditioning effects of plantar pressure on flexion reflex excitability in patients with motor complete spinal cord injury (SCI). In five motor complete SCI subjects, the non-nociceptive flexion reflex was evoked via electrical stimulation of the right sural nerve and was recorded from the ipsilateral tibialis anterior muscle. Pressure ranging from 25 to 80kPa was applied to the metatarsal heads through an adjustable platform incorporated into a foot rest and a comparison of the reflex size made between control conditions and during pressure application. In all subjects, a significant depression of the long latency flexion reflex was observed when pressure was applied to the foot sole. The short latency flexion reflex appearing at latencies less than 100ms was absent in all patients. The results demonstrate that flexion reflex excitability in the isolated human spinal cord can be modulated by adequate activation of plantar mechanoreceptors. Activation of plantar mechanoreceptors is a feature of normal standing and walking. Rehabilitation for standing and walking in SCI commonly uses body weight support based protocols. The strong inhibitory actions of plantar pressure on reflex pathways in the isolated human spinal cord suggest that sensory feedback from the foot sole may be an important factor in successful rehabilitation of standing and stepping in SCI patients.
    LanguageEnglish
    Pages892-896
    Number of pages5
    JournalClinical Neurophysiology
    Volume119
    Issue number4
    DOIs
    Publication statusPublished - Apr 2008

    Fingerprint

    Reflex
    Spinal Cord
    Pressure
    Spinal Cord Injuries
    Foot
    Mechanoreceptors
    Walking
    Rehabilitation
    Sural Nerve
    Sensory Feedback
    Metatarsal Bones
    Electric Stimulation
    Body Weight
    Muscles

    Keywords

    • flexion reflex
    • load
    • plantar
    • rehabilitation
    • spinal cord injury

    Cite this

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    The action of plantar pressure on flexion reflex pathways in the isolated human spinal cord. / Conway, B.A.; Knikou, M.

    In: Clinical Neurophysiology, Vol. 119, No. 4, 04.2008, p. 892-896.

    Research output: Contribution to journalArticle

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