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  • Title: Oligosynaptic inhibition of group Ia afferents from brachioradialis to triceps brachii motor neurons in humans.
    Author: Sato T, Nito M, Suzuki K, Fujii H, Hashizume W, Miyasaka T, Shindo M, Naito A.
    Journal: Muscle Nerve; 2018 Jan; 57(1):122-128. PubMed ID: 28398686.
    Abstract:
    INTRODUCTION: This study examines effects of low-threshold afferents from the brachioradialis (BR) on excitability of triceps brachii (TB) motor neurons in humans. METHODS: We evaluated the effects using a post stimulus time histogram (PSTH) and electromyogram averaging (EMG-A) methods in 13 healthy human participants. Electrical conditioning stimulation to the radial nerve branch innervating BR with the intensity below the motor threshold was delivered. RESULTS: In the PSTH study, the stimulation produced a trough (inhibition) in 36/69 TB motor units for all the participants. A cutaneous stimulation never provoked such inhibition. The central latency of the inhibition was 1.5 ± 0.5 ms longer than that of the homonymous facilitation. In the EMG-A study, the stimulation produced inhibition in EMG-A of TB in all participants. The inhibition diminished with a tonic vibration stimulation to BR. DISCUSSION: These findings suggest that oligosynaptic inhibition mediated by group Ia afferents from BR to TB exists in humans. Muscle Nerve 57: 122-128, 2018.
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