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Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters

The purpose of this study was to investigate potential sex differences in the fatigue‐ and recovery‐induced responses of isometric strength and power, as well as select dynamic contractile parameters after isometric and isotonic plantar flexor (PF) contractions. Healthy males (n = 12; age = 21.8 ± 2...

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Autores principales: Ha, Phuong L., Dalton, Benjamin E., Alesi, Michaela G., Smith, Tyler M., VanDusseldorp, Trisha A., Feito, Yuri, Hester, Garrett M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8123565/
https://www.ncbi.nlm.nih.gov/pubmed/33991453
http://dx.doi.org/10.14814/phy2.14821
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author Ha, Phuong L.
Dalton, Benjamin E.
Alesi, Michaela G.
Smith, Tyler M.
VanDusseldorp, Trisha A.
Feito, Yuri
Hester, Garrett M.
author_facet Ha, Phuong L.
Dalton, Benjamin E.
Alesi, Michaela G.
Smith, Tyler M.
VanDusseldorp, Trisha A.
Feito, Yuri
Hester, Garrett M.
author_sort Ha, Phuong L.
collection PubMed
description The purpose of this study was to investigate potential sex differences in the fatigue‐ and recovery‐induced responses of isometric strength and power, as well as select dynamic contractile parameters after isometric and isotonic plantar flexor (PF) contractions. Healthy males (n = 12; age = 21.8 ± 2.2 years) and females (n = 14; age = 21.4 ± 2.5 years) performed a 2‐min maximal voluntary isometric contraction and 120 concentric isotonic (30% peak isometric torque) contractions of the PFs on separate visits. Isometric strength, isotonic power, as well as torque‐ and velocity‐related parameters were recorded before, immediately after, and throughout 10 min of recovery. Rate of EMG rise (RER) for the medial gastrocnemius (MG) and soleus was also obtained. All measures responded similarly between sexes after both fatiguing modalities (p > 0.05), except RER of the MG which, in males demonstrated both, a greater decrease during isotonic contractions (p = 0.038, [Formula: see text]  = 0.174) and more rapid recovery after isometric exercise (p = 0.043, [Formula: see text]  = 0.166). Although not significant, a nearly large effect size was demonstrated for the fatigue‐induced decrease in isometric strength (p = 0.061; d = 0.77) due to relative decreases tending to be greater in males (−29% vs. −17%). Regardless of fatiguing modality, sex differences were minimal for fatigue and recovery‐related responses in muscle function for the PFs, although the difference for RER may indicate a unique origin of fatigue. Further support for the disassociation between the response in isometric strength and power after fatiguing exercise was also demonstrated.
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spelling pubmed-81235652021-05-21 Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters Ha, Phuong L. Dalton, Benjamin E. Alesi, Michaela G. Smith, Tyler M. VanDusseldorp, Trisha A. Feito, Yuri Hester, Garrett M. Physiol Rep Original Articles The purpose of this study was to investigate potential sex differences in the fatigue‐ and recovery‐induced responses of isometric strength and power, as well as select dynamic contractile parameters after isometric and isotonic plantar flexor (PF) contractions. Healthy males (n = 12; age = 21.8 ± 2.2 years) and females (n = 14; age = 21.4 ± 2.5 years) performed a 2‐min maximal voluntary isometric contraction and 120 concentric isotonic (30% peak isometric torque) contractions of the PFs on separate visits. Isometric strength, isotonic power, as well as torque‐ and velocity‐related parameters were recorded before, immediately after, and throughout 10 min of recovery. Rate of EMG rise (RER) for the medial gastrocnemius (MG) and soleus was also obtained. All measures responded similarly between sexes after both fatiguing modalities (p > 0.05), except RER of the MG which, in males demonstrated both, a greater decrease during isotonic contractions (p = 0.038, [Formula: see text]  = 0.174) and more rapid recovery after isometric exercise (p = 0.043, [Formula: see text]  = 0.166). Although not significant, a nearly large effect size was demonstrated for the fatigue‐induced decrease in isometric strength (p = 0.061; d = 0.77) due to relative decreases tending to be greater in males (−29% vs. −17%). Regardless of fatiguing modality, sex differences were minimal for fatigue and recovery‐related responses in muscle function for the PFs, although the difference for RER may indicate a unique origin of fatigue. Further support for the disassociation between the response in isometric strength and power after fatiguing exercise was also demonstrated. John Wiley and Sons Inc. 2021-05-15 /pmc/articles/PMC8123565/ /pubmed/33991453 http://dx.doi.org/10.14814/phy2.14821 Text en © 2021 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Ha, Phuong L.
Dalton, Benjamin E.
Alesi, Michaela G.
Smith, Tyler M.
VanDusseldorp, Trisha A.
Feito, Yuri
Hester, Garrett M.
Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title_full Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title_fullStr Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title_full_unstemmed Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title_short Isometric versus isotonic contractions: Sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
title_sort isometric versus isotonic contractions: sex differences in the fatigability and recovery of isometric strength and high‐velocity contractile parameters
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8123565/
https://www.ncbi.nlm.nih.gov/pubmed/33991453
http://dx.doi.org/10.14814/phy2.14821
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