Erschienen in:

03.05.2024 | Research Article

Mutual oligosynaptic inhibition of group Ia afferents between the anterior and posterior parts of the deltoid in humans

verfasst von: Takuya Yoshimoto, Mitsuhiro Nito, Wataru Hashizume, Kazuto Shimada, Tomomi Sato, Masaomi Shindo, Akira Naito

Erschienen in: Experimental Brain Research | Ausgabe 6/2024

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Abstract

The anterior (DA) and posterior parts of the deltoid (DP) show alternating contraction during shoulder flexion and extension movements. It is expected that an inhibitory spinal reflex between the DA and DP exists. In this study, spinal reflexes between the DA and DP were examined in healthy human subjects using post-stimulus time histogram (PSTH) and electromyogram averaging (EMG-A). Electrical conditioning stimulation was delivered to the axillary nerve branch that innervates the DA (DA nerve) and DP (DP nerve) with the intensity below the motor threshold. In the PSTH study, the stimulation to the DA and DP nerves inhibited (decrease in the firing probability) 31 of 54 DA motor units and 31 of 51 DP motor units. The inhibition was not provoked by cutaneous stimulation. The central synaptic delay of the inhibition between the DA and DP nerves was 1.5 ± 0.5 ms and 1.4 ± 0.4 ms (mean ± SD) longer than those of the homonymous facilitation of the DA and DP, respectively. In the EMG-A study, conditioning stimulation to the DA and DP nerves inhibited the rectified and averaged EMG of the DP and DA, respectively. The inhibition diminished with tonic vibration stimulation to the DA and DP and recovered 20–30 min after vibration removal. These findings suggest that oligo(di or tri)-synaptic inhibition mediated by group Ia afferents between the DA and DP exists in humans.

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Titel: Mutual oligosynaptic inhibition of group Ia afferents between the anterior and posterior parts of the deltoid in humans
verfasst von: Takuya Yoshimoto
Mitsuhiro Nito
Wataru Hashizume
Kazuto Shimada
Tomomi Sato
Masaomi Shindo
Akira Naito
Publikationsdatum: 03.05.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Experimental Brain Research / Ausgabe 6/2024
Print ISSN: 0014-4819
Elektronische ISSN: 1432-1106
DOI: https://doi.org/10.1007/s00221-024-06834-7

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Mutual oligosynaptic inhibition of group Ia afferents between the anterior and posterior parts of the deltoid in humans

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