Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13179
Title: Examining the low, high and range measures of muscle activity amplitudes in symptomatic and asymptomatic computer users performing typing and mousing tasks
Authors: Szeto, GPY 
Straker, LM
O'Sullivan, PB
Keywords: Computer use
EMG
Motor control
Neck pain
Trapezius
WMSD
Issue Date: 2009
Publisher: Springer
Source: European journal of applied physiology, 2009, v. 106, no. 2, p. 243-251 How to cite?
Journal: European journal of applied physiology 
Abstract: Past studies on work-related musculoskeletal disorders (WMSD) have reported increased median muscle activities in terms of 50th% of amplitude probability distribution function (APDF), and this was thought to be a manifestation of altered motor control - an important mechanism contributing to WMSD. The present study aimed to examine whether such altered motor control was also present in other parameters of APDF - the 10th and 90th% values, which can be considered indicators of the low and high measures of muscle activity. The difference between 10th and 90th% APDF can be considered an indicator of the variation in muscle activity amplitude (the "APDF range"). Surface electromyography was examined in female office workers as Case (n = 21) and Control (n = 18) subjects. The APDF variables were measured in cervical erector spinae (CES) and upper trapezius (UT) muscles during typing, mousing and type-and-mouse, for 20 min each. The Case Group had significantly higher CES activity in the 10th, 90th% and APDF range compared to Controls. The UT muscles showed similar trends but the between-group differences were not statistically significant. These results have demonstrated the robustness of the APDF variables as sensitive indicators of motor control variations in symptomatic subjects with musculoskeletal disorders.
URI: http://hdl.handle.net/10397/13179
ISSN: 1439-6319
EISSN: 1439-6327
DOI: 10.1007/s00421-009-1019-4
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

20
Last Week
1
Last month
1
Citations as of Sep 20, 2017

WEB OF SCIENCETM
Citations

17
Last Week
0
Last month
2
Citations as of Sep 21, 2017

Page view(s)

26
Last Week
1
Last month
Checked on Sep 18, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.