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Effect of sex on torque, recovery, EMG, and MMG responses to fatigue

OBJECTIVE: The purpose of the present investigation was to examine the effect of sex on maximal voluntary isometric contraction (MVIC) torque and the EMG and MMG responses as a result of fatiguing, intermittent, submaximal (65% of MVIC), isometric elbow flexion muscle contractions. METHODS: Eighteen...

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Autores principales: Hill, E.C., Housh, T.J., Smith, C.M., Cochrane, K.C., Jenkins, N.D.M., Cramer, J.T., Schmidt, R.J., Johnson, G.O.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Society of Musculoskeletal and Neuronal Interactions 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5259572/
https://www.ncbi.nlm.nih.gov/pubmed/27973383
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author Hill, E.C.
Housh, T.J.
Smith, C.M.
Cochrane, K.C.
Jenkins, N.D.M.
Cramer, J.T.
Schmidt, R.J.
Johnson, G.O.
author_facet Hill, E.C.
Housh, T.J.
Smith, C.M.
Cochrane, K.C.
Jenkins, N.D.M.
Cramer, J.T.
Schmidt, R.J.
Johnson, G.O.
author_sort Hill, E.C.
collection PubMed
description OBJECTIVE: The purpose of the present investigation was to examine the effect of sex on maximal voluntary isometric contraction (MVIC) torque and the EMG and MMG responses as a result of fatiguing, intermittent, submaximal (65% of MVIC), isometric elbow flexion muscle contractions. METHODS: Eighteen men and women performed MVIC trials before (pretest), after (posttest), and 5-min after (5-min recovery) performing 50 intermittent, submaximal isometric muscle contractions. Surface electromyographic (EMG) and mechanomyographic (MMG) signals were simultaneously recorded from the biceps brachii muscle. RESULTS: As a result of the fatiguing workbout torque decreased similarly from pretest to posttest for both the men (24.0%) and women (23.3%). After 5-min of recovery, torque had partially recovered for the men, while torque had returned to pretest levels for the women. For both sexes, from pretest to posttest EMG mean power frequency and MMG amplitude decreased, but returned to pretest levels after 5-min of recovery. CONCLUSIONS: In the present study, there were sex-related differences in muscle fatigue that were not associated with the EMG or MMG responses.
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spelling pubmed-52595722017-01-30 Effect of sex on torque, recovery, EMG, and MMG responses to fatigue Hill, E.C. Housh, T.J. Smith, C.M. Cochrane, K.C. Jenkins, N.D.M. Cramer, J.T. Schmidt, R.J. Johnson, G.O. J Musculoskelet Neuronal Interact Original Article OBJECTIVE: The purpose of the present investigation was to examine the effect of sex on maximal voluntary isometric contraction (MVIC) torque and the EMG and MMG responses as a result of fatiguing, intermittent, submaximal (65% of MVIC), isometric elbow flexion muscle contractions. METHODS: Eighteen men and women performed MVIC trials before (pretest), after (posttest), and 5-min after (5-min recovery) performing 50 intermittent, submaximal isometric muscle contractions. Surface electromyographic (EMG) and mechanomyographic (MMG) signals were simultaneously recorded from the biceps brachii muscle. RESULTS: As a result of the fatiguing workbout torque decreased similarly from pretest to posttest for both the men (24.0%) and women (23.3%). After 5-min of recovery, torque had partially recovered for the men, while torque had returned to pretest levels for the women. For both sexes, from pretest to posttest EMG mean power frequency and MMG amplitude decreased, but returned to pretest levels after 5-min of recovery. CONCLUSIONS: In the present study, there were sex-related differences in muscle fatigue that were not associated with the EMG or MMG responses. International Society of Musculoskeletal and Neuronal Interactions 2016-12 /pmc/articles/PMC5259572/ /pubmed/27973383 Text en Copyright: © Journal of Musculoskeletal and Neuronal Interactions http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Hill, E.C.
Housh, T.J.
Smith, C.M.
Cochrane, K.C.
Jenkins, N.D.M.
Cramer, J.T.
Schmidt, R.J.
Johnson, G.O.
Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title_full Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title_fullStr Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title_full_unstemmed Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title_short Effect of sex on torque, recovery, EMG, and MMG responses to fatigue
title_sort effect of sex on torque, recovery, emg, and mmg responses to fatigue
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5259572/
https://www.ncbi.nlm.nih.gov/pubmed/27973383
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