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Measurement of wrist flexion and extension torques in different forearm positions

BACKGROUND: Forceful activities of the wrist were considered to be a risk factor for the epicondylitis. However, there are still conflicting evidence concerning work-relatedness of epicondylitis. The main problem is that there is little information about which forearm postures are capable of withsta...

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Autores principales: Yoshii, Yuichi, Yuine, Hiroshi, Kazuki, Ohashi, Tung, Wen-lin, Ishii, Tomoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BioMed Central 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4676844/
https://www.ncbi.nlm.nih.gov/pubmed/26830913
http://dx.doi.org/10.1186/s12938-015-0110-9
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author Yoshii, Yuichi
Yuine, Hiroshi
Kazuki, Ohashi
Tung, Wen-lin
Ishii, Tomoo
author_facet Yoshii, Yuichi
Yuine, Hiroshi
Kazuki, Ohashi
Tung, Wen-lin
Ishii, Tomoo
author_sort Yoshii, Yuichi
collection PubMed
description BACKGROUND: Forceful activities of the wrist were considered to be a risk factor for the epicondylitis. However, there are still conflicting evidence concerning work-relatedness of epicondylitis. The main problem is that there is little information about which forearm postures are capable of withstanding higher torque loads and the extent of the differences in the torques generated by different forearm postures. The objective of this study was to investigate the differences in wrist flexion and extension torques among different forearm positions in healthy subjects. METHODS: Twenty wrists of 10 asymptomatic volunteers were evaluated. The apparatus to measure the wrist torque consisted of a handle with a force sensor and a table to place the forearm in different positions. The direction of the handle can change when measuring different forearm positions. The forearm of the examinee was secured to the table. The participants were asked to exert themselves in maximal isometric contraction for wrist flexion or extension, and to maintain it for 5 s. Each evaluation of the flexion and extension torque was conducted twice. Three forearm positions were evaluated: neutral, pronation, and supination. The intra-class correlation coefficients between first and second measurements were evaluated for the maximum torque. The maximum torques and flexion/extension ratio were compared among the positions. In addition, the agility and endurance for the wrist extension/flexion torques were compared among the positions. RESULTS: The intra-class correlation coefficients between first and second measurements were 0.928 and 0.866 for the wrist flexion and extension measurements, respectively. The highest torques for the wrist flexion and extension were observed in the supination and pronation positions, respectively (P < 0.01). There was a higher extension/flexion ratio in the supination position compared to the other positions (P < 0.05). There was a superior agility for the wrist flexion in the supination position compared to the pronation position. CONCLUSIONS: The normal balance of the wrist flexion–extension torques in different forearm positions were characterized. This information might aid the provision of advice regarding the optimal positions for performing specific tasks and could help to elucidate the pathophysiology of epicondylitis.
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spelling pubmed-46768442015-12-13 Measurement of wrist flexion and extension torques in different forearm positions Yoshii, Yuichi Yuine, Hiroshi Kazuki, Ohashi Tung, Wen-lin Ishii, Tomoo Biomed Eng Online Research BACKGROUND: Forceful activities of the wrist were considered to be a risk factor for the epicondylitis. However, there are still conflicting evidence concerning work-relatedness of epicondylitis. The main problem is that there is little information about which forearm postures are capable of withstanding higher torque loads and the extent of the differences in the torques generated by different forearm postures. The objective of this study was to investigate the differences in wrist flexion and extension torques among different forearm positions in healthy subjects. METHODS: Twenty wrists of 10 asymptomatic volunteers were evaluated. The apparatus to measure the wrist torque consisted of a handle with a force sensor and a table to place the forearm in different positions. The direction of the handle can change when measuring different forearm positions. The forearm of the examinee was secured to the table. The participants were asked to exert themselves in maximal isometric contraction for wrist flexion or extension, and to maintain it for 5 s. Each evaluation of the flexion and extension torque was conducted twice. Three forearm positions were evaluated: neutral, pronation, and supination. The intra-class correlation coefficients between first and second measurements were evaluated for the maximum torque. The maximum torques and flexion/extension ratio were compared among the positions. In addition, the agility and endurance for the wrist extension/flexion torques were compared among the positions. RESULTS: The intra-class correlation coefficients between first and second measurements were 0.928 and 0.866 for the wrist flexion and extension measurements, respectively. The highest torques for the wrist flexion and extension were observed in the supination and pronation positions, respectively (P < 0.01). There was a higher extension/flexion ratio in the supination position compared to the other positions (P < 0.05). There was a superior agility for the wrist flexion in the supination position compared to the pronation position. CONCLUSIONS: The normal balance of the wrist flexion–extension torques in different forearm positions were characterized. This information might aid the provision of advice regarding the optimal positions for performing specific tasks and could help to elucidate the pathophysiology of epicondylitis. BioMed Central 2015-12-12 /pmc/articles/PMC4676844/ /pubmed/26830913 http://dx.doi.org/10.1186/s12938-015-0110-9 Text en © Yoshii et al. 2015 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
spellingShingle Research
Yoshii, Yuichi
Yuine, Hiroshi
Kazuki, Ohashi
Tung, Wen-lin
Ishii, Tomoo
Measurement of wrist flexion and extension torques in different forearm positions
title Measurement of wrist flexion and extension torques in different forearm positions
title_full Measurement of wrist flexion and extension torques in different forearm positions
title_fullStr Measurement of wrist flexion and extension torques in different forearm positions
title_full_unstemmed Measurement of wrist flexion and extension torques in different forearm positions
title_short Measurement of wrist flexion and extension torques in different forearm positions
title_sort measurement of wrist flexion and extension torques in different forearm positions
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4676844/
https://www.ncbi.nlm.nih.gov/pubmed/26830913
http://dx.doi.org/10.1186/s12938-015-0110-9
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