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The role of interaction torque and muscle torque in the control of downward squatting

[Purpose] The purposes of this study were first to analyze the multijoint dynamics of downward squatting, and to examine the contribution of interaction torque and muscle torque to net torque, and second, to examine mechanisms of movement control. [Subjects] The subjects were 31 healthy men with a m...

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Autores principales: Fujisawa, Hiroyuki, Suzuki, Hiroto, Murakami, Kenichi, Kawakami, Shingo, Suzuki, Makoto
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Society of Physical Therapy Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793020/
https://www.ncbi.nlm.nih.gov/pubmed/27065552
http://dx.doi.org/10.1589/jpts.28.613
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author Fujisawa, Hiroyuki
Suzuki, Hiroto
Murakami, Kenichi
Kawakami, Shingo
Suzuki, Makoto
author_facet Fujisawa, Hiroyuki
Suzuki, Hiroto
Murakami, Kenichi
Kawakami, Shingo
Suzuki, Makoto
author_sort Fujisawa, Hiroyuki
collection PubMed
description [Purpose] The purposes of this study were first to analyze the multijoint dynamics of downward squatting, and to examine the contribution of interaction torque and muscle torque to net torque, and second, to examine mechanisms of movement control. [Subjects] The subjects were 31 healthy men with a mean age of 21.0 ± 1.2 years (range, 19–24 years). [Methods] Squatting tasks with the trunk in two positions, an erect and anterior tilt position, were performed by the subjects. Net, interaction, muscle, and gravity torque were calculated according to the Lagrange equation using 3D tracking data. [Results] The contribution ratio of interaction torque to net torque was approximately 90%, irrespective of the joint and task. In contrast, muscle torque showed complicated behavior to compensate for gravity torque. A combined muscle and gravity torque profile showed flexion or dorsiflexion immediately after the initiation of the movement, and it later changed to extension or plantar flexion. [Conclusion] The torque that contributes almost exclusively to the net torque was interaction torque. The combination of muscle and gravity torque at the knee joint and the hip joint is important for movement control, independent of the starting position.
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spelling pubmed-47930202016-04-08 The role of interaction torque and muscle torque in the control of downward squatting Fujisawa, Hiroyuki Suzuki, Hiroto Murakami, Kenichi Kawakami, Shingo Suzuki, Makoto J Phys Ther Sci Original Article [Purpose] The purposes of this study were first to analyze the multijoint dynamics of downward squatting, and to examine the contribution of interaction torque and muscle torque to net torque, and second, to examine mechanisms of movement control. [Subjects] The subjects were 31 healthy men with a mean age of 21.0 ± 1.2 years (range, 19–24 years). [Methods] Squatting tasks with the trunk in two positions, an erect and anterior tilt position, were performed by the subjects. Net, interaction, muscle, and gravity torque were calculated according to the Lagrange equation using 3D tracking data. [Results] The contribution ratio of interaction torque to net torque was approximately 90%, irrespective of the joint and task. In contrast, muscle torque showed complicated behavior to compensate for gravity torque. A combined muscle and gravity torque profile showed flexion or dorsiflexion immediately after the initiation of the movement, and it later changed to extension or plantar flexion. [Conclusion] The torque that contributes almost exclusively to the net torque was interaction torque. The combination of muscle and gravity torque at the knee joint and the hip joint is important for movement control, independent of the starting position. The Society of Physical Therapy Science 2016-02-29 2016-02 /pmc/articles/PMC4793020/ /pubmed/27065552 http://dx.doi.org/10.1589/jpts.28.613 Text en 2016©by the Society of Physical Therapy Science. Published by IPEC Inc. http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License.
spellingShingle Original Article
Fujisawa, Hiroyuki
Suzuki, Hiroto
Murakami, Kenichi
Kawakami, Shingo
Suzuki, Makoto
The role of interaction torque and muscle torque in the control of downward squatting
title The role of interaction torque and muscle torque in the control of downward squatting
title_full The role of interaction torque and muscle torque in the control of downward squatting
title_fullStr The role of interaction torque and muscle torque in the control of downward squatting
title_full_unstemmed The role of interaction torque and muscle torque in the control of downward squatting
title_short The role of interaction torque and muscle torque in the control of downward squatting
title_sort role of interaction torque and muscle torque in the control of downward squatting
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4793020/
https://www.ncbi.nlm.nih.gov/pubmed/27065552
http://dx.doi.org/10.1589/jpts.28.613
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