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Methods for ergonomics assessment of agricultural work with hand tools
2001 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The objective of the study was to develop methods for ergonomics assessment of agricultural work with hand tools in the laboratory and thereafter adapted in the field. A total of eight male graduate students (mean age, height and weight were 29.4 years, 176.8 cm and 81.0 kg respectively) participated in a digging task using a hand hoe. The digging task was performed within three minutes in a 2 m * 1.5 m metal box full of moist sand. 3 video cameras were installed to record the working posture. At the last minute, during interval of 15 seconds, heart rates (HR) along with rate of perceived exertion (RPE) 6-20 were measured to assess the physical load. Awkward postures while the hoe lifted up as well as stroke the soil were frozen and different joint angles were measured to provide input for 3- dimesional static strength prediction programme (3D SSPP). The data analyses included linear regression for HR as a function of RPE: 3D SSPP software calculated the percentage of population capable of performing the task and low-back compressive forces. Compression force on L5/S1 was plotted as a function of HR and RPE. The results revealed that the correlation coefficient (r) for HR and RPE (p<0.05) was 0.59: the measured and perceived physical load range from light to heavy. the output obtained from the software showed that low-back compressive forces were below the niosh recommended safe limit (3400 n) when the hoe lifted up. however, when the hoe stroke the soil, compression force on l5/s1 for 25% from the subjects exceeded the niosh safe limit and therefore they were at high risk of back injury. when the force on l5/s1 plotted as a function of hr and rpe, the results showed that there was no linear relationship between these variables. in conclusion, hr a long with rpe proved to be used in the laboratory as well as in the field. 3d sspp could be used in the laboratory, nevertheless, in the field, one video camera would be appropriate.

Place, publisher, year, edition, pages
Keyword [en]
Technology, hand tools, ergonomics
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51835ISRN: LTU-EX--01/195--SELocal ID: 903b5956-9855-4d33-a674-584a00909256OAI: diva2:1025199
Subject / course
Student thesis, at least 15 credits
Educational program
Ergonomics, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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