The Friction Force Mouse-Pad and the Forearm Muscles Efforts
Jose Miquel Cabecas*
Identifiers and Pagination:Year: 2010
First Page: 1
Last Page: 13
Publisher Id: TOERGJ-3-1
Article History:Received Date: 13/07/2009
Revision Received Date: 16/10/2009
Acceptance Date: 02/12/2009
Electronic publication date: 29/1/2010
Collection year: 2010
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The objective of the article is to evaluate the impact of the friction force mouse-pad in the contraction level of the forearm muscles M. extensor carpi ulnaris, M. extensor digitorum and M. extensor carpi radialis longus. A standard protocol of mouse movements was performed involving horizontal, vertical and diagonal mouse displacements drag-anddrop type. The operators were instructed to execute the protocol with their normal working speed. The movements protocol were performed by each subject (n=17) with three selected pairs mouse-pad, classified as low, medium and high friction force pairs. The mean time to execute the protocol with each mouse was ∼138 s. Mean values of ∼13%MVE (Maximum Voluntary Electromyography signal), ∼17%MVE and ∼10%MVE were found in the M. extensor digitorum, M. extensor carpi ulnaris and in the M. extensor carpi radialis longus respectively when performing the movements' protocol. A 8.1% increase in %MVE was observed in the M. extensor digitorum and a 9.4% increase in %MVE was observed in the M. extensor carpi ulnaris when the high friction force pair was operated, relatively to the low friction force pair (p < 0.05). The main conclusions of this study is that operating a high friction force mouse-pad (with 79 g of static longitudinal friction force measured with a compression force of 100 g on the mouse) may increase the risk to symptoms or disorders in the wrist, particularly during work with drawing applications, due to an increase in the forearm muscles contraction levels.