Interlimb neural interactions in corticospinal and spinal reflex circuits during preparation and execution of isometric elbow flexion.

Journal of Neurophysiology
Atsushi SasakiKimitaka Nakazawa

Abstract

Although coordinated and simultaneous movement of upper and lower limb muscles is required for activities of daily living, interlimb neural interaction mechanisms and their nature are yet to be fully elucidated. The purpose of this study was to investigate effects of motor preparation and execution of ipsilateral, contralateral, and bilateral upper limb muscle contractions on the excitability of corticospinal and spinal reflex circuits of the lower limb muscles. Fourteen able-bodied individuals were recruited in each study. Experiments were conducted to investigate 1) corticospinal excitability with transcranial magnetic stimulation applied on the primary motor cortex to evoke motor evoked potentials (MEPs) and 2) spinal reflex excitability with transcutaneous spinal cord stimulation applied at the lumbothoracic level to evoke spinal reflexes. Measurements were recorded from multiple right lower limb muscles simultaneously during 1) ipsilateral (right), 2) contralateral (left), and 3) bilateral (right and left) elbow flexion. The results indicate that MEPs in lower limb muscles were facilitated during both preparation and execution of elbow flexion, whereas spinal reflexes were facilitated only during motor execution. Moreover,...Continue Reading

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