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Recovery need in manual work: Development and application of an assessment tool.
KTH, School of Technology and Health (STH), Ergonomics.
2012 (English)In: Book ocf abstracts: NES2012 Ergonomics for Sustainability and Growth / [ed] Antonson, A-B, Hägg, GM, Vogel, K, Stockholm: KTH , 2012, 16-16 p.Conference paper, Abstract (Refereed)
Abstract [en]


Incomplete recovery is considered as one of the main causes for developing MSDs. This paper describes the further development and application of an assessment tool, Ergo-Index, which can be used to analyse different ways to perform a work task considering load ergonomics as well as time aspects. It can support decision making when choosing production methods and help reduce the physical load and the risk of MSDs in combination with good production economics.



The objectives were to further develop the existing Ergo-Index by i) gaining data to understand how load level and loading time affect recovery need ii) modelling the recovery need, iii) refining the existing Ergo-Index model iv) testing and implementing the model and gathering examples in a database and v) disseminating the results.



An experimental study was carried out with 10 participants. over 16 sessions, each participant pushed a handle, in which static force and time were altered between the sessions. Subjectively rated Endurance time (ET) and Resumption time (Tres), defined as the time period needed after loading until the participant would resume the task if it was his job, was noted, as well as other parameters. Based on experimental data mathematical relationships were established, using regression analysis. A new version of the Ergo-Index was developed based on the results and results from literature. The new tool was coded as a simple Excel-program and applied to 10 typical work tasks in industry and evaluated using biomechanical and subjective methods.


The main results were data for ET, Tres and Rating of perceived discomfort/fatigue and a new Ergo-Index model, which is described briefly in the conference paper. Some applied examples are illustrated in the presentation.



Different types of fatigue and models are discussed, as well as issues when trying to model the complex phenomena of fatigue.



It is concluded that the recovery time can be modelled as a relationship between load level and loading time, and that the method has to be further used and validated.

Place, publisher, year, edition, pages
Stockholm: KTH , 2012. 16-16 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-117477ISBN: 978-91-637-1149-7OAI: diva2:602000
The 44th International the Nordic Ergonomics Society Conference, NES2012, in Saltsjöbaden, Stockholm, Sweden, August 19-22
SBUF's "Ergo-Index – Vidareutveckling och tillämpning av modell om samband mellan belastning, arbetsställning och återhämtning"Afa's "Ergo-Index Etapp 2:Vidareutveckling av metod för analys av produktionsmetoder –samband mellan belastningsfaktorer, återhämtning, risk och produktionstid"

QC 20130529

Available from: 2013-01-30 Created: 2013-01-30 Last updated: 2013-05-29Bibliographically approved

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