Cargando…
Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction
PURPOSE: Neuromuscular electrical stimulation (NMES) superimposed on voluntary muscle contraction has been recently shown as an innovative training modality within sport and rehabilitation, but its effects on the neuromuscular system are still unclear. The aim of this study was to investigate acute...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7419370/ https://www.ncbi.nlm.nih.gov/pubmed/32676751 http://dx.doi.org/10.1007/s00421-020-04430-5 |
_version_ | 1783569869597310976 |
---|---|
author | Borzuola, Riccardo Labanca, Luciana Macaluso, Andrea Laudani, Luca |
author_facet | Borzuola, Riccardo Labanca, Luciana Macaluso, Andrea Laudani, Luca |
author_sort | Borzuola, Riccardo |
collection | PubMed |
description | PURPOSE: Neuromuscular electrical stimulation (NMES) superimposed on voluntary muscle contraction has been recently shown as an innovative training modality within sport and rehabilitation, but its effects on the neuromuscular system are still unclear. The aim of this study was to investigate acute responses in spinal excitability, as measured by the Hoffmann (H) reflex, and in maximal voluntary contraction (MVIC) following NMES superimposed to voluntary isometric contractions (NMES + ISO) compared to passive NMES only and to voluntary isometric contractions only (ISO). METHOD: Fifteen young adults were required to maintain an ankle plantar-flexor torque of 20% MVC for 20 repetitions during each experimental condition (NMES + ISO, NMES and ISO). Surface electromyography was used to record peak-to-peak H-reflex and motor waves following percutaneous stimulation of the posterior tibial nerve in the dominant limb. An isokinetic dynamometer was used to assess maximal voluntary contraction output of the ankle plantar flexor muscles. RESULTS: H-reflex amplitude was increased by 4.5% after the NMES + ISO condition (p < 0.05), while passive NMES and ISO conditions showed a decrease by 7.8% (p < 0.05) and no change in reflex responses, respectively. There was no change in amplitude of maximal motor wave and in MVIC torque during each experimental condition. CONCLUSION: The reported facilitation of spinal excitability following NMES + ISO could be due to a combination of greater motor neuronal and corticospinal excitability, thus suggesting that NMES superimposed onto isometric voluntary contractions may provide a more effective neuromuscular stimulus and, hence, training modality compared to NMES alone. |
format | Online Article Text |
id | pubmed-7419370 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-74193702020-08-17 Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction Borzuola, Riccardo Labanca, Luciana Macaluso, Andrea Laudani, Luca Eur J Appl Physiol Original Article PURPOSE: Neuromuscular electrical stimulation (NMES) superimposed on voluntary muscle contraction has been recently shown as an innovative training modality within sport and rehabilitation, but its effects on the neuromuscular system are still unclear. The aim of this study was to investigate acute responses in spinal excitability, as measured by the Hoffmann (H) reflex, and in maximal voluntary contraction (MVIC) following NMES superimposed to voluntary isometric contractions (NMES + ISO) compared to passive NMES only and to voluntary isometric contractions only (ISO). METHOD: Fifteen young adults were required to maintain an ankle plantar-flexor torque of 20% MVC for 20 repetitions during each experimental condition (NMES + ISO, NMES and ISO). Surface electromyography was used to record peak-to-peak H-reflex and motor waves following percutaneous stimulation of the posterior tibial nerve in the dominant limb. An isokinetic dynamometer was used to assess maximal voluntary contraction output of the ankle plantar flexor muscles. RESULTS: H-reflex amplitude was increased by 4.5% after the NMES + ISO condition (p < 0.05), while passive NMES and ISO conditions showed a decrease by 7.8% (p < 0.05) and no change in reflex responses, respectively. There was no change in amplitude of maximal motor wave and in MVIC torque during each experimental condition. CONCLUSION: The reported facilitation of spinal excitability following NMES + ISO could be due to a combination of greater motor neuronal and corticospinal excitability, thus suggesting that NMES superimposed onto isometric voluntary contractions may provide a more effective neuromuscular stimulus and, hence, training modality compared to NMES alone. Springer Berlin Heidelberg 2020-07-17 2020 /pmc/articles/PMC7419370/ /pubmed/32676751 http://dx.doi.org/10.1007/s00421-020-04430-5 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Original Article Borzuola, Riccardo Labanca, Luciana Macaluso, Andrea Laudani, Luca Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title | Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title_full | Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title_fullStr | Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title_full_unstemmed | Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title_short | Modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
title_sort | modulation of spinal excitability following neuromuscular electrical stimulation superimposed to voluntary contraction |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7419370/ https://www.ncbi.nlm.nih.gov/pubmed/32676751 http://dx.doi.org/10.1007/s00421-020-04430-5 |
work_keys_str_mv | AT borzuolariccardo modulationofspinalexcitabilityfollowingneuromuscularelectricalstimulationsuperimposedtovoluntarycontraction AT labancaluciana modulationofspinalexcitabilityfollowingneuromuscularelectricalstimulationsuperimposedtovoluntarycontraction AT macalusoandrea modulationofspinalexcitabilityfollowingneuromuscularelectricalstimulationsuperimposedtovoluntarycontraction AT laudaniluca modulationofspinalexcitabilityfollowingneuromuscularelectricalstimulationsuperimposedtovoluntarycontraction |