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Impact of moment arm on torque production of the knee extensors in children

The joint moment arm (MA) dimension is related to joint torque in adults. However, this relationship remains unexplored in children. In this study, we aimed to determine the relationship between MA and joint torque of the knee extensors in this young population. The quadriceps femoris muscle volume...

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Autores principales: Tottori, Nobuaki, Suga, Tadashi, Hori, Miyuki, Isaka, Tadao, Fujita, Satoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7484879/
https://www.ncbi.nlm.nih.gov/pubmed/32875748
http://dx.doi.org/10.14814/phy2.14521
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author Tottori, Nobuaki
Suga, Tadashi
Hori, Miyuki
Isaka, Tadao
Fujita, Satoshi
author_facet Tottori, Nobuaki
Suga, Tadashi
Hori, Miyuki
Isaka, Tadao
Fujita, Satoshi
author_sort Tottori, Nobuaki
collection PubMed
description The joint moment arm (MA) dimension is related to joint torque in adults. However, this relationship remains unexplored in children. In this study, we aimed to determine the relationship between MA and joint torque of the knee extensors in this young population. The quadriceps femoris muscle volume (MV) and knee extensor MA in 20 preadolescent boys (age: 10.7 ± 0.9 years) were measured using magnetic resonance imaging. The knee extensor isometric and isokinetic torques were measured using a dynamometer. The isokinetic torque measurements were performed using slow and fast angular velocities at 60°/s and 180°/s respectively. The knee extensor torque‐producing capacities were assessed as the knee extensor isometric or isokinetic torque per the quadriceps femoris MV. The quadriceps femoris MV correlated significantly with all three knee extensor isometric and isokinetic torques (r = 0.513–0.804, p < .05 for all). The knee extensor MA also correlated significantly with the three knee extensor isometric and isokinetic torques (r = 0.701–0.806, p ≤ .001 for all). Furthermore, the knee extensor MA correlated significantly with all three knee extensor torque‐producing capacities (r = 0.488–0.701, p < .05 for all). These findings suggest that in addition to adults, greater MA plays an important role in achieving higher joint torque production of the knee extensors in preadolescent boys. This study is the first to determine the impact of MA dimension on joint torque production in children.
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spelling pubmed-74848792020-09-17 Impact of moment arm on torque production of the knee extensors in children Tottori, Nobuaki Suga, Tadashi Hori, Miyuki Isaka, Tadao Fujita, Satoshi Physiol Rep Original Research The joint moment arm (MA) dimension is related to joint torque in adults. However, this relationship remains unexplored in children. In this study, we aimed to determine the relationship between MA and joint torque of the knee extensors in this young population. The quadriceps femoris muscle volume (MV) and knee extensor MA in 20 preadolescent boys (age: 10.7 ± 0.9 years) were measured using magnetic resonance imaging. The knee extensor isometric and isokinetic torques were measured using a dynamometer. The isokinetic torque measurements were performed using slow and fast angular velocities at 60°/s and 180°/s respectively. The knee extensor torque‐producing capacities were assessed as the knee extensor isometric or isokinetic torque per the quadriceps femoris MV. The quadriceps femoris MV correlated significantly with all three knee extensor isometric and isokinetic torques (r = 0.513–0.804, p < .05 for all). The knee extensor MA also correlated significantly with the three knee extensor isometric and isokinetic torques (r = 0.701–0.806, p ≤ .001 for all). Furthermore, the knee extensor MA correlated significantly with all three knee extensor torque‐producing capacities (r = 0.488–0.701, p < .05 for all). These findings suggest that in addition to adults, greater MA plays an important role in achieving higher joint torque production of the knee extensors in preadolescent boys. This study is the first to determine the impact of MA dimension on joint torque production in children. John Wiley and Sons Inc. 2020-09-01 /pmc/articles/PMC7484879/ /pubmed/32875748 http://dx.doi.org/10.14814/phy2.14521 Text en © 2020 The Authors. Physiological Reports published by Wiley Periodicals LLC on behalf of The Physiological Society and the American Physiological Society This is an open access article under the terms of the http://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 Research
Tottori, Nobuaki
Suga, Tadashi
Hori, Miyuki
Isaka, Tadao
Fujita, Satoshi
Impact of moment arm on torque production of the knee extensors in children
title Impact of moment arm on torque production of the knee extensors in children
title_full Impact of moment arm on torque production of the knee extensors in children
title_fullStr Impact of moment arm on torque production of the knee extensors in children
title_full_unstemmed Impact of moment arm on torque production of the knee extensors in children
title_short Impact of moment arm on torque production of the knee extensors in children
title_sort impact of moment arm on torque production of the knee extensors in children
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7484879/
https://www.ncbi.nlm.nih.gov/pubmed/32875748
http://dx.doi.org/10.14814/phy2.14521
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