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Open AccessArticle

Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle

College of Health and Human Sciences, Osaka Prefecture University, Habikino City 583-8555, Japan
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Author to whom correspondence should be addressed.
Brain Sci. 2020, 10(4), 230; https://doi.org/10.3390/brainsci10040230
Received: 12 March 2020 / Revised: 9 April 2020 / Accepted: 10 April 2020 / Published: 11 April 2020
(This article belongs to the Collection Collection on Systems Neuroscience)
We determined the precise time windows of the electromyographic (EMG) response components triggered by ankle motion and by body sway above the ankle. A support surface under the feet of healthy young adult participants in the quiet stance was moved in translation. The EMG response component triggered by body displacement above the ankle began at 95–100 ms and ended 145–155 ms after the onset of the support surface translation. The EMG response triggered by ankle dorsiflexion began at 35–50 ms and ended 110–115 ms after the onset of the translation in the soleus muscle, indicating that the response component began at a time similar to the short-latency response. In contrast, the response component in the gastrocnemius muscle began noticeably after that. The EMG response triggered by ankle dorsiflexion began at 75–85 ms and ended 125–135 ms after the onset of the translation in the gastrocnemius muscle. Our findings indicate that the threshold of the early response component to the somatic sensation of the ankle motion in the soleus muscle is lower than that in the gastrocnemius muscle. The response component triggered by the ankle motion continued long after the end of ankle dorsiflexion, indicating that the early component is mediated not only by the monosynaptic stretch reflex pathway but also by the polysynaptic pathway. View Full-Text
Keywords: perturbation; postural control; soleus; gastrocnemius; electromyography; somatic sensation perturbation; postural control; soleus; gastrocnemius; electromyography; somatic sensation
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Hiraoka, K.; Kuramitsu, T.; Nii, N.; Osumi, M.; Tanaka, N. Time Window of Perturbation-Induced Response Triggered by Ankle Motion and Body Sway above the Ankle. Brain Sci. 2020, 10, 230.

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