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The relationship between long latency responses and height.

D Claus, S Jakob

    Journal of Neurology
    |October 1, 1986
    PubMed
    Summary
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    Long latency reflexes in healthy subjects show a transcortical reflex loop in the upper limbs, correlating with height. However, lower limb reflexes do not correlate with height, preventing intraspinal conduction time calculations.

    Area of Science:

    • Neuroscience
    • Human Physiology
    • Electrophysiology

    Background:

    • Nerve conduction studies are crucial for diagnosing neurological disorders.
    • Understanding reflex pathways helps elucidate central and peripheral nervous system function.
    • Long latency reflexes offer insights into complex neural circuits.

    Purpose of the Study:

    • To investigate long latency reflex responses in healthy individuals.
    • To differentiate between transcortical and spinal reflex pathways.
    • To assess the feasibility of calculating intraspinal conduction time using these reflexes.

    Main Methods:

    • Electrical stimulation of nerve trunks in upper and lower extremities.
    • Recording of long latency (M2) and segmental (M1) reflex responses.

    Related Experiment Videos

  • Analysis of reflex latencies and correlation with subject height in 83 healthy participants.

    • Main Results:

    • Latency differences between M2 and M1 responses in the hand correlated significantly with subject height.
    • This height correlation suggests a transcortical reflex loop for upper limb responses.
    • No correlation between lower leg late reflex responses and height was observed, indicating a different origin.

    Conclusions:

    • The findings confirm a transcortical reflex loop for upper limb long latency responses.
    • The lack of height correlation in lower limb responses suggests a polysynaptic spinal origin.
    • Calculating intraspinal conduction time from long latency reflex examinations is not feasible with current methods.