The effect of grip force, stroke rotation and frequency on discomfort for a torqueing tasks.
BACKGROUND: Occupational tasks involve awkward upper limb postures, especially movement of forearm with repetitive combined gripping and torqueing exertions, which may lead to development of WMSDs. From the literature survey it was observed that there was a lack of studies focussed on the combined e...
| Publicado en: | Work Vol. 53; no. 4; pp. 691 - 709 |
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| Autores principales: | , , |
| Formato: | equations & formulas pictorial research tables/charts Journal Article |
| Publicado: |
Sage Publications Inc.
2016
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=114649051&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 114649051 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 10519815 3RC jtl: Work issn: 10519815 maglogo: N pubinfo: dt: 2016 vid: 53 iid: 4 pid: 344 pub: Sage Publications Inc. place: Thousand Oaks, California artinfo: ui: 114649051 114649051 114649051 10.3233/WOR-152146 114649051 ppf: 691 ppct: 18 formats: fmt: @attributes: type: P tig: atl: The effect of grip force, stroke rotation and frequency on discomfort for a torqueing tasks. aug: au: Bano, Farheen Mallick, Zulqernian Khan, Abid Ali affil: Department of Industrial Engineering, King Abdul Aziz University, Jeddah, KSA sug: subj: Grip Strength Task Performance and Analysis India Comfort Upper Extremity Human India Analysis of Variance Electromyography Multivariate Analysis of Variance Male Adult Visual Analog Scaling Post Hoc Analysis T-Tests Repeated Measures One-Way Analysis of Variance Funding Source Adult: 19-44 years Male ab: BACKGROUND: Occupational tasks involve awkward upper limb postures, especially movement of forearm with repetitive combined gripping and torqueing exertions, which may lead to development of WMSDs. From the literature survey it was observed that there was a lack of studies focussed on the combined effect of torque and grip exertions on forearm discomfort. OBJECTIVE: The present study was to investigate the effects of grip force, stroke rotation and frequency of exertions on discomfort and Electromyography (EMG) activities of the forearm muscles in a repetitive torqueing task. METHOD: Twenty-seven male participants volunteered in this study. The participants performed repetitive exertions for a 5 minutes duration for each combination of the different levels of stroke rotation, grip force and frequency of exertions. Three levels of stroke rotation, three levels of grip force and three levels of frequency of exertion were chosen as independent variables. Therefore a 3×3 customized factorial design was used for the experiment for each level of grip force. Hence, the study was divided into three groups on the basis of grip force (50N, 70N and 90N). RESULTS: The ANOVA showed that stroke rotation and frequency of exertion were significant on discomfort. Further Students Newmann test (SNK) revealed that discomfort was increased with increasing stroke rotation and frequency of exertion. The multivariate analysis of variances (MANOVA) performed on EMG data instead of ANOVA because EMG activities of five muscles simultaneously were recorded. The Results found that extensor muscles were more fatigued in torqueing with gripping task. CONCLUSIONS: It was found that stroke rotation for the torqueing tasks must be kept below 45°. It was concluded that it is important to control stroke rotation to improve performance of repetitive torqueing activity. pubtype: Academic Journal doctype: equations & formulas pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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