Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation.
Transcutaneous electrical stimulation is a relatively new technique to evoke spinal reflexes in lower limb muscles. The advantage of this technique is that the spinal reflex responses can be obtained from multiple lower limb muscles simultaneously. However, repeatability of spinal reflexes evoked by...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2019-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0214818 |
| _version_ | 1819028963494723584 |
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| author | Akira Saito Yohei Masugi Kento Nakagawa Hiroki Obata Kimitaka Nakazawa |
| author_facet | Akira Saito Yohei Masugi Kento Nakagawa Hiroki Obata Kimitaka Nakazawa |
| author_sort | Akira Saito |
| collection | DOAJ |
| description | Transcutaneous electrical stimulation is a relatively new technique to evoke spinal reflexes in lower limb muscles. The advantage of this technique is that the spinal reflex responses can be obtained from multiple lower limb muscles simultaneously. However, repeatability of spinal reflexes evoked by transcutaneous spinal cord stimulation between days has not been evaluated. We aimed to examine repeatability of recruitment properties of the spinal reflexes evoked by transcutaneous spinal cord stimulation. Recruitment curves of the spinal reflexes evoked by transcutaneous spinal cord stimulation of 8 lower limb muscles (i.e., foot, lower leg, and thigh muscles) of 20 males were measured on two consecutive days. To confirm that responses were caused by activation of the sensory fiber, a double-pulse stimulation with 50 ms inter-pulse interval was delivered. Peak-to-peak amplitude of the first response was calculated for each muscle when no response was observed in the second response owing to post-activation depression. For comparison with the spinal reflexes evoked by transcutaneous spinal cord stimulation, the recruitment curves of the H-reflex amplitude of the soleus of 9 males were measured. Threshold intensity and maximal slope of the recruitment curves were calculated, and inter-day repeatability of the properties was quantified using intraclass correlation coefficients. For the spinal reflexes evoked by transcutaneous spinal cord stimulation, the intraclass correlation coefficient values of threshold intensity and maximal slope for each muscle ranged from 0.487 to 0.874 and from 0.471 to 0.964, respectively. Regarding the soleus H-reflex, the intraclass correlation coefficients of threshold intensity and maximal slope were 0.936 and 0.751, respectively. The present data showed that repeatability of the recruitment properties of the spinal reflexes evoked by transcutaneous spinal cord stimulation in the lower limb was moderate to high. Measurement of the spinal reflexes evoked by transcutaneous spinal cord stimulation would be useful for longitudinal neurophysiological studies. |
| first_indexed | 2024-12-21T06:06:43Z |
| format | Article |
| id | doaj.art-4021baa53921493abdf2e2afc37502a9 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T06:06:43Z |
| publishDate | 2019-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-4021baa53921493abdf2e2afc37502a92022-12-21T19:13:38ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01144e021481810.1371/journal.pone.0214818Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation.Akira SaitoYohei MasugiKento NakagawaHiroki ObataKimitaka NakazawaTranscutaneous electrical stimulation is a relatively new technique to evoke spinal reflexes in lower limb muscles. The advantage of this technique is that the spinal reflex responses can be obtained from multiple lower limb muscles simultaneously. However, repeatability of spinal reflexes evoked by transcutaneous spinal cord stimulation between days has not been evaluated. We aimed to examine repeatability of recruitment properties of the spinal reflexes evoked by transcutaneous spinal cord stimulation. Recruitment curves of the spinal reflexes evoked by transcutaneous spinal cord stimulation of 8 lower limb muscles (i.e., foot, lower leg, and thigh muscles) of 20 males were measured on two consecutive days. To confirm that responses were caused by activation of the sensory fiber, a double-pulse stimulation with 50 ms inter-pulse interval was delivered. Peak-to-peak amplitude of the first response was calculated for each muscle when no response was observed in the second response owing to post-activation depression. For comparison with the spinal reflexes evoked by transcutaneous spinal cord stimulation, the recruitment curves of the H-reflex amplitude of the soleus of 9 males were measured. Threshold intensity and maximal slope of the recruitment curves were calculated, and inter-day repeatability of the properties was quantified using intraclass correlation coefficients. For the spinal reflexes evoked by transcutaneous spinal cord stimulation, the intraclass correlation coefficient values of threshold intensity and maximal slope for each muscle ranged from 0.487 to 0.874 and from 0.471 to 0.964, respectively. Regarding the soleus H-reflex, the intraclass correlation coefficients of threshold intensity and maximal slope were 0.936 and 0.751, respectively. The present data showed that repeatability of the recruitment properties of the spinal reflexes evoked by transcutaneous spinal cord stimulation in the lower limb was moderate to high. Measurement of the spinal reflexes evoked by transcutaneous spinal cord stimulation would be useful for longitudinal neurophysiological studies.https://doi.org/10.1371/journal.pone.0214818 |
| spellingShingle | Akira Saito Yohei Masugi Kento Nakagawa Hiroki Obata Kimitaka Nakazawa Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. PLoS ONE |
| title | Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. |
| title_full | Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. |
| title_fullStr | Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. |
| title_full_unstemmed | Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. |
| title_short | Repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation. |
| title_sort | repeatability of spinal reflexes of lower limb muscles evoked by transcutaneous spinal cord stimulation |
| url | https://doi.org/10.1371/journal.pone.0214818 |
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