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Reflex facilitation by remote contraction: topographic aspects

P Toulouse, P J Delwaide

    Archives of Physical Medicine and Rehabilitation
    |November 1, 1980
    PubMed
    Summary
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    Upper limb muscle contraction facilitates lower limb reflexes, with the quadriceps reflex showing greater enhancement. This facilitation follows a three-phase pattern and varies based on the specific muscles contracted.

    Area of Science:

    • Neuroscience
    • Human Physiology
    • Motor Control

    Background:

    • Remote muscle contractions can influence reflex responses in other body parts.
    • Understanding these inter-limb reflex interactions is crucial for motor control research.

    Purpose of the Study:

    • To compare the facilitation of different lower limb reflexes by upper limb muscle contraction.
    • To investigate how different upper limb muscle groups affect a specific lower limb reflex.
    • To analyze the time course and quantify the extent of reflex facilitation.

    Main Methods:

    • Able-bodied subjects performed selective upper limb muscle contractions.
    • Lower limb tendon reflexes (quadriceps, soleus, biceps femoris) were measured.
    • Electrically induced reflexes were used for comparison.

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  • Facilitation was quantified as a percentage of maximal motor response.

    • Main Results:

    • Quadriceps tendon reflex showed greater facilitation than soleus and biceps femoris reflexes.
    • Facilitation followed a consistent three-phase time course across reflexes.
    • Electrically induced quadriceps reflexes were facilitated similarly to tendon jerks, but only in phase 2.
    • Thenar muscle contraction facilitated the quadriceps reflex more than deltoid contraction.
    • Wrist extensor contraction facilitated the quadriceps reflex more than wrist flexors.

    Conclusions:

    • The degree of lower limb reflex facilitation by upper limb contraction depends on the reflex's segmental level and the specific conditioning muscle group.
    • Quantification reveals significant differences in facilitation, highlighting the importance of considering both reflex location and conditioning muscle.
    • These findings provide insights into the functional role of remote muscle contractions in modulating spinal reflex activity.