Assessment of H reflex sensitivity with M wave alternation consequent to fatiguing contractions

Ing-Shiou Hwang, Cheng Ya Huang, Pei Shan Wu, Yi Ching Chen, Chun Hou Wang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The objective of this study was to examine the changes in H reflex sensitivity after neuromuscular fatigue associated with fluctuations of the M wave. In the maximal and submaximal voluntary contraction (MVC and SMVC) paradigms, subjects performed voluntary plantarflexion at 100% MVC and 40% MVC respectively until the limit of torque maintenance was reached. In the submaximal electrical stimulation (SMES) paradigm, the tricep surae was exhausted with sustained electrical stimulation of 40% of the maximal tolerable intensity at a 40-Hz stimulus rate. The H reflexes and maximal M waves (Mmax) of the soleus were recorded before and after the three fatigue paradigms, and the H reflex was standardized with Mmax to minimize possible bias due to fatigue-induced M wave fluctuation. The results showed a significant increase in the standardized H reflex due to the SMES paradigm in spite of Mmax potentiation. The SMVC paradigm led to a reduction in size of the standardized H reflex without modification of Mmax, whereas the standardized H reflex was not mediated by the MVC paradigm, which contributed to a noticeable Mmax potentiation. The present study underscored the fact that the H reflex sensitivity and M wave amplitude were not necessarily suppressed consequent to neuromuscular fatigue, but varied with the activation history of a muscle for size-dependent efficacy of the Ia transmission pathways and postactivation potentiation.

Original languageEnglish
Pages (from-to)1317-1330
Number of pages14
JournalInternational Journal of Neuroscience
Volume118
Issue number9
DOIs
Publication statusPublished - 2008 Sep 1

Fingerprint

H-Reflex
Fatigue
Electric Stimulation
Torque
Maintenance
Muscles

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

Cite this

Hwang, Ing-Shiou ; Huang, Cheng Ya ; Wu, Pei Shan ; Chen, Yi Ching ; Wang, Chun Hou. / Assessment of H reflex sensitivity with M wave alternation consequent to fatiguing contractions. In: International Journal of Neuroscience. 2008 ; Vol. 118, No. 9. pp. 1317-1330.
@article{bc8dcf6406094e2da2d8de76f4787b13,
title = "Assessment of H reflex sensitivity with M wave alternation consequent to fatiguing contractions",
abstract = "The objective of this study was to examine the changes in H reflex sensitivity after neuromuscular fatigue associated with fluctuations of the M wave. In the maximal and submaximal voluntary contraction (MVC and SMVC) paradigms, subjects performed voluntary plantarflexion at 100{\%} MVC and 40{\%} MVC respectively until the limit of torque maintenance was reached. In the submaximal electrical stimulation (SMES) paradigm, the tricep surae was exhausted with sustained electrical stimulation of 40{\%} of the maximal tolerable intensity at a 40-Hz stimulus rate. The H reflexes and maximal M waves (Mmax) of the soleus were recorded before and after the three fatigue paradigms, and the H reflex was standardized with Mmax to minimize possible bias due to fatigue-induced M wave fluctuation. The results showed a significant increase in the standardized H reflex due to the SMES paradigm in spite of Mmax potentiation. The SMVC paradigm led to a reduction in size of the standardized H reflex without modification of Mmax, whereas the standardized H reflex was not mediated by the MVC paradigm, which contributed to a noticeable Mmax potentiation. The present study underscored the fact that the H reflex sensitivity and M wave amplitude were not necessarily suppressed consequent to neuromuscular fatigue, but varied with the activation history of a muscle for size-dependent efficacy of the Ia transmission pathways and postactivation potentiation.",
author = "Ing-Shiou Hwang and Huang, {Cheng Ya} and Wu, {Pei Shan} and Chen, {Yi Ching} and Wang, {Chun Hou}",
year = "2008",
month = "9",
day = "1",
doi = "10.1080/00207450802055606",
language = "English",
volume = "118",
pages = "1317--1330",
journal = "International Journal of Neuroscience",
issn = "0020-7454",
publisher = "Informa Healthcare",
number = "9",

}

Assessment of H reflex sensitivity with M wave alternation consequent to fatiguing contractions. / Hwang, Ing-Shiou; Huang, Cheng Ya; Wu, Pei Shan; Chen, Yi Ching; Wang, Chun Hou.

In: International Journal of Neuroscience, Vol. 118, No. 9, 01.09.2008, p. 1317-1330.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessment of H reflex sensitivity with M wave alternation consequent to fatiguing contractions

AU - Hwang, Ing-Shiou

AU - Huang, Cheng Ya

AU - Wu, Pei Shan

AU - Chen, Yi Ching

AU - Wang, Chun Hou

PY - 2008/9/1

Y1 - 2008/9/1

N2 - The objective of this study was to examine the changes in H reflex sensitivity after neuromuscular fatigue associated with fluctuations of the M wave. In the maximal and submaximal voluntary contraction (MVC and SMVC) paradigms, subjects performed voluntary plantarflexion at 100% MVC and 40% MVC respectively until the limit of torque maintenance was reached. In the submaximal electrical stimulation (SMES) paradigm, the tricep surae was exhausted with sustained electrical stimulation of 40% of the maximal tolerable intensity at a 40-Hz stimulus rate. The H reflexes and maximal M waves (Mmax) of the soleus were recorded before and after the three fatigue paradigms, and the H reflex was standardized with Mmax to minimize possible bias due to fatigue-induced M wave fluctuation. The results showed a significant increase in the standardized H reflex due to the SMES paradigm in spite of Mmax potentiation. The SMVC paradigm led to a reduction in size of the standardized H reflex without modification of Mmax, whereas the standardized H reflex was not mediated by the MVC paradigm, which contributed to a noticeable Mmax potentiation. The present study underscored the fact that the H reflex sensitivity and M wave amplitude were not necessarily suppressed consequent to neuromuscular fatigue, but varied with the activation history of a muscle for size-dependent efficacy of the Ia transmission pathways and postactivation potentiation.

AB - The objective of this study was to examine the changes in H reflex sensitivity after neuromuscular fatigue associated with fluctuations of the M wave. In the maximal and submaximal voluntary contraction (MVC and SMVC) paradigms, subjects performed voluntary plantarflexion at 100% MVC and 40% MVC respectively until the limit of torque maintenance was reached. In the submaximal electrical stimulation (SMES) paradigm, the tricep surae was exhausted with sustained electrical stimulation of 40% of the maximal tolerable intensity at a 40-Hz stimulus rate. The H reflexes and maximal M waves (Mmax) of the soleus were recorded before and after the three fatigue paradigms, and the H reflex was standardized with Mmax to minimize possible bias due to fatigue-induced M wave fluctuation. The results showed a significant increase in the standardized H reflex due to the SMES paradigm in spite of Mmax potentiation. The SMVC paradigm led to a reduction in size of the standardized H reflex without modification of Mmax, whereas the standardized H reflex was not mediated by the MVC paradigm, which contributed to a noticeable Mmax potentiation. The present study underscored the fact that the H reflex sensitivity and M wave amplitude were not necessarily suppressed consequent to neuromuscular fatigue, but varied with the activation history of a muscle for size-dependent efficacy of the Ia transmission pathways and postactivation potentiation.

UR - http://www.scopus.com/inward/record.url?scp=49549096257&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=49549096257&partnerID=8YFLogxK

U2 - 10.1080/00207450802055606

DO - 10.1080/00207450802055606

M3 - Article

VL - 118

SP - 1317

EP - 1330

JO - International Journal of Neuroscience

JF - International Journal of Neuroscience

SN - 0020-7454

IS - 9

ER -