Document Detail


Method and performance: two elements of work technique.
MedLine Citation:
PMID:  9629065     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the present study work technique was viewed in two basic elements: the method of carrying out a work task and the individual performance of the work task. The aim was to investigate how eight selected kinematic, kinetic, electromyographic and psychophysical variables can characterize the two elements of work technique. Twelve female subjects lifted a box using two methods, back and leg lifts, and two different simulated performances, fast and slow lifts. Motions, ground reaction forces, muscle activity in the lower back and perceived exertion were measured. A dynamic biomechanical model was applied. The trunk angular displacement and velocity clearly separated the lift methods. The trunk angular velocities and accelerations, the L5/S1 moments and the EMG variables were closely related to the performances. The work technique varied between the subjects to a greater extent than the individual variability over repetitions of a lift task. A larger inter-individual variability for kinematic variables was mostly shown in leg lifts compared with back lifts. The EMG patterns displayed differences in muscle activation that were not revealed by the kinematic or kinetic patterns. The results imply that separate variables should be used for descriptions of work methods and task performances; for method descriptions ranges of motion seem to be appropriate, for performance descriptions displacement time derivatives and load variables seem to be more useful. Moreover, the inter-individual differences suggest that work technique should be evaluated on an individual level.
Authors:
K Kjellberg; L Lindbeck; M Hagberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ergonomics     Volume:  41     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  1998 Jun 
Date Detail:
Created Date:  1998-08-07     Completed Date:  1998-08-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  798-816     Citation Subset:  IM; S    
Affiliation:
Department for Work and Health, National Institute for Working Life, Solna, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Back
Female
Humans
Leg
Lifting*
Middle Aged
Muscle, Skeletal / physiology
Posture / physiology
Psychophysics
Task Performance and Analysis*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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