Effect of primary motor cortex excitability changes after quadripulse transcranial magnetic stimulation on kinesthetic sensitivity: A preliminary study. (10th January 2021)

• Record Type: Journal Article
• Authors: Okawada, Megumi; Kaneko, Fuminari; Shibata, Eriko
• Is Part Of: Neuroscience letters. Volume 741(2021)
• Publication Date: 2021-01-10
• Subjects: QPS quadripulse transcranial magnetic stimulation -- M1 primary motor cortex -- rTMS repetitive transcranial magnetic stimulation -- PMd dorsal premotor cortex -- MEP motor evoked potential -- JMDT joint motion detection threshold -- EMG electromyography -- APB abductor pollicis brevis -- CM carpometacarpal -- TA tibialis anterior -- MVC maximum voluntary contraction -- FDI first dorsal interosseous -- SEP somatosensory evoked potentials; Inesthetic perception -- Joint motor detection threshold -- Quadripulse -- Transcranial -- Magnetic stimulation -- Primary motor cortex; Neurology -- Periodicals; Neurology -- Periodicals; Research -- Periodicals; Neurologie -- Périodiques; Neuroanatomie -- Périodiques; Neuropharmacologie -- Périodiques; Neurophysiologie -- Périodiques; Neurology; Periodicals; Electronic journals; 617.48
• DOI: 10.1016/j.neulet.2020.135483
• Languages: English
• ISSNs: 0304-3940

Abstract

Highlights: Changes in M1 excitability on kinesthetic sensitivity was examined. Quadripulse TMS increased M1 excitability and kinesthetic sensitivity. The primary motor cortex plays an important role in kinesthetic perception. Abstract: Muscle spindles provide the greatest contribution to kinesthetic perception. Primary motor cortex (M1) excitability changes in parallel with the intensity of kinesthetic perception inputs from muscle spindles; M1 is therefore involved in kinesthetic perception. However, the causal relationship between changes in kinesthetic sensitivity and M1 excitability is unclear. The purpose of this study was to test whether artificially and sustainably modulated M1 excitability causes changes in kinesthetic sensitivity in healthy individuals. We evaluated motor evoked potentials (MEP) in Experiment 1 and joint motion detection thresholds (JMDT) in Experiment 2 before and after quadripulse transcranial magnetic stimulation (QPS). Nine healthy right-handed male volunteers were recruited. In each experiment, participants received QPS or sham stimulation (Sham) on separate days. MEP amplitude and JMDT were recorded before and at 0, 15, 30, 45, and 60 min after QPS and Sham. Our results showed that M1 excitability and kinesthetic sensitivity increased after QPS, whereas neither changed after Sham. In the five subjects who participated in both experiments, there was a significant moderate correlation between M1 excitability and kinesthetic sensitivity. Thus, the long-lasting change in kinesthetic sensitivity may be due to changes in M1 excitability. In addition, M1 may play a gain adjustment role in the neural pathways of muscle spindle input.