Cargando…

Effects of grip force on median nerve deformation at different wrist angles

The present study investigated the effects of grip on changes in the median nerve cross-sectional area (MNCSA) and median nerve diameter in the radial-ulnar direction (D1) and dorsal-palmar direction (D2) at three wrist angles. Twenty-nine healthy participants (19 men [mean age, 24.2 ± 1.6 years]; 1...

Descripción completa

Detalles Bibliográficos
Autores principales: Loh, Ping Yeap, Nakashima, Hiroki, Muraki, Satoshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: PeerJ Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036108/
https://www.ncbi.nlm.nih.gov/pubmed/27688983
http://dx.doi.org/10.7717/peerj.2510
_version_ 1782455497325019136
author Loh, Ping Yeap
Nakashima, Hiroki
Muraki, Satoshi
author_facet Loh, Ping Yeap
Nakashima, Hiroki
Muraki, Satoshi
author_sort Loh, Ping Yeap
collection PubMed
description The present study investigated the effects of grip on changes in the median nerve cross-sectional area (MNCSA) and median nerve diameter in the radial-ulnar direction (D1) and dorsal-palmar direction (D2) at three wrist angles. Twenty-nine healthy participants (19 men [mean age, 24.2 ± 1.6 years]; 10 women [mean age, 24.0 ± 1.6 years]) were recruited. The median nerve was examined at the proximal carpal tunnel region in three grip conditions, namely finger relaxation, unclenched fist, and clenched fist. Ultrasound examinations were performed in the neutral wrist position (0°), at 30°wrist flexion, and at 30°wrist extension for both wrists. The grip condition and wrist angle showed significant main effects (p < 0.01) on the changes in the MNCSA, D1, and D2. Furthermore, significant interactions (p < 0.01) were found between the grip condition and wrist angle for the MNCSA, D1, and D2. In the neutral wrist position (0°), significant reductions in the MNCSA, D1, and D2 were observed when finger relaxation changed to unclenched fist and clenched fist conditions. Clenched fist condition caused the highest deformations in the median nerve measurements (MNCSA, approximately −25%; D1, −13%; D2, −12%). The MNCSA was significantly lower at 30°wrist flexion and 30°wrist extension than in the neutral wrist position (0°) at unclenched fist and clenched fist conditions. Notably, clenched fist condition at 30°wrist flexion showed the highest reduction of the MNCSA (−29%). In addition, 30°wrist flexion resulted in a lower D1 at clenched fist condition. In contrast, 30°wrist extension resulted in a lower D2 at both unclenched fist and clenched fist conditions. Our results suggest that unclenched fist and clenched fist conditions cause reductions in the MNCSA, D1, and D2. More importantly, unclenched fist and clenched fist conditions at 30°wrist flexion and 30°wrist extension can lead to further deformation of the median nerve.
format Online
Article
Text
id pubmed-5036108
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher PeerJ Inc.
record_format MEDLINE/PubMed
spelling pubmed-50361082016-09-29 Effects of grip force on median nerve deformation at different wrist angles Loh, Ping Yeap Nakashima, Hiroki Muraki, Satoshi PeerJ Kinesiology The present study investigated the effects of grip on changes in the median nerve cross-sectional area (MNCSA) and median nerve diameter in the radial-ulnar direction (D1) and dorsal-palmar direction (D2) at three wrist angles. Twenty-nine healthy participants (19 men [mean age, 24.2 ± 1.6 years]; 10 women [mean age, 24.0 ± 1.6 years]) were recruited. The median nerve was examined at the proximal carpal tunnel region in three grip conditions, namely finger relaxation, unclenched fist, and clenched fist. Ultrasound examinations were performed in the neutral wrist position (0°), at 30°wrist flexion, and at 30°wrist extension for both wrists. The grip condition and wrist angle showed significant main effects (p < 0.01) on the changes in the MNCSA, D1, and D2. Furthermore, significant interactions (p < 0.01) were found between the grip condition and wrist angle for the MNCSA, D1, and D2. In the neutral wrist position (0°), significant reductions in the MNCSA, D1, and D2 were observed when finger relaxation changed to unclenched fist and clenched fist conditions. Clenched fist condition caused the highest deformations in the median nerve measurements (MNCSA, approximately −25%; D1, −13%; D2, −12%). The MNCSA was significantly lower at 30°wrist flexion and 30°wrist extension than in the neutral wrist position (0°) at unclenched fist and clenched fist conditions. Notably, clenched fist condition at 30°wrist flexion showed the highest reduction of the MNCSA (−29%). In addition, 30°wrist flexion resulted in a lower D1 at clenched fist condition. In contrast, 30°wrist extension resulted in a lower D2 at both unclenched fist and clenched fist conditions. Our results suggest that unclenched fist and clenched fist conditions cause reductions in the MNCSA, D1, and D2. More importantly, unclenched fist and clenched fist conditions at 30°wrist flexion and 30°wrist extension can lead to further deformation of the median nerve. PeerJ Inc. 2016-09-22 /pmc/articles/PMC5036108/ /pubmed/27688983 http://dx.doi.org/10.7717/peerj.2510 Text en ©2016 Loh et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
spellingShingle Kinesiology
Loh, Ping Yeap
Nakashima, Hiroki
Muraki, Satoshi
Effects of grip force on median nerve deformation at different wrist angles
title Effects of grip force on median nerve deformation at different wrist angles
title_full Effects of grip force on median nerve deformation at different wrist angles
title_fullStr Effects of grip force on median nerve deformation at different wrist angles
title_full_unstemmed Effects of grip force on median nerve deformation at different wrist angles
title_short Effects of grip force on median nerve deformation at different wrist angles
title_sort effects of grip force on median nerve deformation at different wrist angles
topic Kinesiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036108/
https://www.ncbi.nlm.nih.gov/pubmed/27688983
http://dx.doi.org/10.7717/peerj.2510
work_keys_str_mv AT lohpingyeap effectsofgripforceonmediannervedeformationatdifferentwristangles
AT nakashimahiroki effectsofgripforceonmediannervedeformationatdifferentwristangles
AT murakisatoshi effectsofgripforceonmediannervedeformationatdifferentwristangles