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Development and validation of work movement task analysis: part 2

This paper elucidates the second part of the development of Work Movement Task Analysis (WMTA). This part involves improvements of the WMTA previous version and validation test using experimental approach. Methods: Current study comprises of three main objectives; (1) to investigate specific muscle...

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Main Authors: Shamsudin, Mohd. Z., Daud, Mohd. Y., Mustafa, Mohd. J. A., Arshad, Mohd. A., Jathin, Romizan, Mahad, Mohd. S. D.
Format: Article
Published: Asian Research Publishing Network 2016
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://eprints.utm.my/id/eprint/69182/
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spelling my.utm.691822017-11-20T08:52:17Z http://eprints.utm.my/id/eprint/69182/ Development and validation of work movement task analysis: part 2 Shamsudin, Mohd. Z. Daud, Mohd. Y. Mustafa, Mohd. J. A. Arshad, Mohd. A. Jathin, Romizan Mahad, Mohd. S. D. TA Engineering (General). Civil engineering (General) This paper elucidates the second part of the development of Work Movement Task Analysis (WMTA). This part involves improvements of the WMTA previous version and validation test using experimental approach. Methods: Current study comprises of three main objectives; (1) to investigate specific muscle activity subject to the WMTA risk rating (combination of Posture and Load, (2) to determine differences of perceived exertion (Posture and Movement) subject to the WMTA risk rating, (3) to determine differences of perceived exertion (Load and Load size) subject to the WMTA risk rating. A total 14 participants with no previous history of musculoskeletal injuries handled a load (5kg and 10kg) from the low risk to the high risk workstation setting on three simulation trials. For objective (1), Electromyography (EMG) data was recorded during the tasks then demeaned, high band-pass filtered using sixth order Butterworth filter at 25-30Hz then full-wave rectification. Subsequently low-pass filtered using fourth order Butterworth filter at 4Hz and mean absolute values (MAV) were obtained. MAV were applied for normalizing the EMG data with respect to the percentage of maximal voluntary contraction (MVC) for every muscle involves. For objective (2) & (3), perceived effort determined using the Borg's scale. Results: Experiment I: Workstation height and load variations significantly affected EMG. There was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores; Left anterior deltoid p<0.000, Right anterior deltoid p<0.001, Right upper trapezius p<0.005, Left upper trapezius p<0.001, Right erector spinae p<0.001 and Left erector spinae p<0.000. Experiment II-simulation 1: there was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores. Significant different (p<0.007) perceived effort of the participant for Task 1, Task 2 and Task 3. Experiment II - simulation 2: : there was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores. Significant different (p<0.016) perceived effort of the participant for Task 1, Task 2 and Task 3. Conclusions: The study provides evidence to support the validity of the WMTA tools that focused on the combination of ergonomic risk factors; Postures and Loads, Posture and Movement & Load and Load Size. This tool is expected to provide new workplace ergonomic observational tool with solid experimental validation to assess WMSDs for the next stage of the case study. Asian Research Publishing Network 2016 Article PeerReviewed Shamsudin, Mohd. Z. and Daud, Mohd. Y. and Mustafa, Mohd. J. A. and Arshad, Mohd. A. and Jathin, Romizan and Mahad, Mohd. S. D. (2016) Development and validation of work movement task analysis: part 2. ARPN Journal of Engineering and Applied Sciences, 11 (10). pp. 6574-6583. ISSN 1819-6608 http://www.scopus.com
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Shamsudin, Mohd. Z.
Daud, Mohd. Y.
Mustafa, Mohd. J. A.
Arshad, Mohd. A.
Jathin, Romizan
Mahad, Mohd. S. D.
Development and validation of work movement task analysis: part 2
description This paper elucidates the second part of the development of Work Movement Task Analysis (WMTA). This part involves improvements of the WMTA previous version and validation test using experimental approach. Methods: Current study comprises of three main objectives; (1) to investigate specific muscle activity subject to the WMTA risk rating (combination of Posture and Load, (2) to determine differences of perceived exertion (Posture and Movement) subject to the WMTA risk rating, (3) to determine differences of perceived exertion (Load and Load size) subject to the WMTA risk rating. A total 14 participants with no previous history of musculoskeletal injuries handled a load (5kg and 10kg) from the low risk to the high risk workstation setting on three simulation trials. For objective (1), Electromyography (EMG) data was recorded during the tasks then demeaned, high band-pass filtered using sixth order Butterworth filter at 25-30Hz then full-wave rectification. Subsequently low-pass filtered using fourth order Butterworth filter at 4Hz and mean absolute values (MAV) were obtained. MAV were applied for normalizing the EMG data with respect to the percentage of maximal voluntary contraction (MVC) for every muscle involves. For objective (2) & (3), perceived effort determined using the Borg's scale. Results: Experiment I: Workstation height and load variations significantly affected EMG. There was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores; Left anterior deltoid p<0.000, Right anterior deltoid p<0.001, Right upper trapezius p<0.005, Left upper trapezius p<0.001, Right erector spinae p<0.001 and Left erector spinae p<0.000. Experiment II-simulation 1: there was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores. Significant different (p<0.007) perceived effort of the participant for Task 1, Task 2 and Task 3. Experiment II - simulation 2: : there was a trend of increasing of muscles activity from Task 1 to Task 3 relative to the WMTA scores. Significant different (p<0.016) perceived effort of the participant for Task 1, Task 2 and Task 3. Conclusions: The study provides evidence to support the validity of the WMTA tools that focused on the combination of ergonomic risk factors; Postures and Loads, Posture and Movement & Load and Load Size. This tool is expected to provide new workplace ergonomic observational tool with solid experimental validation to assess WMSDs for the next stage of the case study.
format Article
author Shamsudin, Mohd. Z.
Daud, Mohd. Y.
Mustafa, Mohd. J. A.
Arshad, Mohd. A.
Jathin, Romizan
Mahad, Mohd. S. D.
author_facet Shamsudin, Mohd. Z.
Daud, Mohd. Y.
Mustafa, Mohd. J. A.
Arshad, Mohd. A.
Jathin, Romizan
Mahad, Mohd. S. D.
author_sort Shamsudin, Mohd. Z.
title Development and validation of work movement task analysis: part 2
title_short Development and validation of work movement task analysis: part 2
title_full Development and validation of work movement task analysis: part 2
title_fullStr Development and validation of work movement task analysis: part 2
title_full_unstemmed Development and validation of work movement task analysis: part 2
title_sort development and validation of work movement task analysis: part 2
publisher Asian Research Publishing Network
publishDate 2016
url http://eprints.utm.my/id/eprint/69182/
http://www.scopus.com
_version_ 1643656025167888384
score 13.211869

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