| The effects of horizontal load speed and lifting frequency on lifting technique and biomechanics. | |
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MedLine Citation:
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PMID: 20658396 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Lifting loads that have a horizontal velocity (e.g. lifting from a conveyor) is often seen in industry and it was hypothesised that the inertial characteristics of these loads may influence lifting technique and low back stress. Seventeen male participants were asked to perform lifting tasks under conditions of four horizontal load speeds (0 m/s, 0.7 m/s, 1.3 m/s and 2.4 m/s) and two lifting frequencies (10 and 20 lifts/min) while trunk motions and trunk muscle activation levels were monitored. Results revealed that increasing horizontal load speed from 0 m/s to 2.4 m/s resulted in an increase in peak sagittal angle (73 degrees vs. 81 degrees ) but lower levels of peak sagittal plane angular acceleration (480 degrees /s(2) vs. 420 [corrected] degrees /s(2)) and peak transverse plane angular acceleration (200 degrees /s per s vs. 140 degrees /s per s) and a consistent increase in trunk muscle co-activation. Participants used the inertia of the load to reduce the peak dynamics of the lifting motion at a cost of increased trunk flexion and higher muscle activity. STATEMENT OF RELEVANCE: Conveyors are ubiquitous in industry and understanding the effects of horizontal load speed on the lifting motions performed by workers lifting items from these conveyors may provide some insight into low back injury risk posed by these tasks. |
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Authors:
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Boyi Dai; Sangeun Jin; Xiaopeng Ning; Gary A Mirka |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Ergonomics Volume: 53 ISSN: 1366-5847 ISO Abbreviation: Ergonomics Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-07-26 Completed Date: 2010-12-02 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0373220 Medline TA: Ergonomics Country: England |
Other Details:
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Languages: eng Pagination: 1024-32 Citation Subset: IM; S |
Affiliation:
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The Ergonomics Laboratory, Department of Industrial and Manufacturing Systems Engineering, Iowa State University, Ames, IA 50011-2164, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acceleration* Adult Biomechanics / physiology* Electromyography Humans Iowa Lifting* Male Occupational Exposure* Posture / physiology Task Performance and Analysis Weight-Bearing Young Adult |
| Comments/Corrections | |
Erratum In:
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Ergonomics. 2010 Sep;53(9):1151 |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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