Bio-mechanical Analysis of the Grapevine Cluster Thinning Task using Working Chair

Title & Authors
Bio-mechanical Analysis of the Grapevine Cluster Thinning Task using Working Chair
Lee, Kyung-Suk; Kim, Hyo-Cher; Chae, Hye-Seon; Kim, Kyung-Ran; Lim, Dae-Seop;

Abstract
Objective: This study examined the effects of working chair that was developed for farmers who work in grapevine's cluster thinning. Background: Agricultural work involves some of the nation's highest occupational risk exposures. Fruit cultivation has been recognized as one of the most hazardous crops in which to work. Grapevine cluster thinning task involve activities related to the main risk factors associated with upper limb work-related musculoskeletal disorders. Method: An experiment was designed to test the working chair. Six healthy male($\small{25.8{\pm}4.9years}$) were selected as the subjects for this study. Electromyography(EMG) was used to monitor the muscles activity, and Electro-goniometer was used to measure the ranges of motions of the elbow, trunk and knee. Subjective test was also carried out to examine discomfort body parts and their pain intensity. A grapevine's working space was built for the experiment and working chair was installed on it. In order to examine the muscle activity and range of motion, subjects used to the working chair for 30 minutes for each experimental condition. Another test without working chair was also performed for comparison. %MVC was used to quantify the level of muscle activity. Results: Decreases of muscle activity was found in all leg muscles and significant decrease of muscle activity was found in left Gastrocnemius. The range of motion of the trunk and knee also decreased when working chair used. Discomfort in lower back, thigh and shank region were reduced significantly. However, in upper limbs muscle activity tended to increase in working chair compared with conventional task. Conclusion: Improvement for cushion in seat back and pan required to reduce discomfort in buttocks. Application: Overall findings verified that the working chair might help to prevent upper limb and lower back MSDs based on the current study. These results can be practically used for work improvement for the grapevine growers to prevent MSDs.
Keywords
Grapevine cluster thinning;Working Chair;Biomechanical analysis;Ergonomic Intervention;
Language
Korean
Cited by
References
1.
Kim, K. R., A study on the farmers' health status and musculoskeletal workload, Ph.D. thesis, Seoul National University, Seoul, South Korea, 2008.

2.
Kim, K. W., Chai, H. S. and Lee, K. S., "The Study on the Improvement of Grape Heading Work through Working Chair of Rail-Drift", Proc. Spring Conf. the Ergonomics Society of Korea, (pp.28-33), Suwon, Korea, 2008.

3.
Kim, H. N. and Hwang, K. M., A study on the current labor of female farmers, RLSI Research Report, 1991.

4.
RDA, Report on comparison and analysis for main disease and health status in farmer and fisherman, Suwon, South Korea, Publ. No. 11-1390093-000107-01, National Academy of Agricultural Science, Suwon, South Korea, 2004.

5.
RRDI, Prevention for agricultural injuries and diseases and safety management program, 2006.

6.
RRDI, Musculoskeletal risk factors and high risky works on 12 type of crops through video analysis, 2006.

7.
Lee, Y. H., Lee, J. H., Lee, K. S., Kim, K. R. and Lee, S. J., Ergonomic risk factors related to musculoskeletal symptoms in the vineyard workers, J Korean Soc Occup Environ Hyg, 18(2), 122-132, 2008.

8.
Choi, J. W., Chung, S. T. and Seol, H., Study on farm work environment and physical load in Korea - Focusing on health survey, living behavior, cumulative fatigue symptoms by crops, The Korean Journal of Community living Science, 9(2), 43-50, 1998.

9.
Choi, J. W., Kim, M. J. and Lee, J. Y., Evaluation of farmer's workload and thermal environments during harvesting grape in summer, Journal of the Korea Home Economics Association, 40(11), 1-13, 2002.

10.
Kato, A. E., Fathallah, F. A., Miles, J. A., Meyers, J. M., Faucett, J., Janowitz, I. and Garcia, E.G., Ergonomic Evaluation of Winegrape Trellis Systems Pruning Operation. Journal of Agricultural Safety and Health, 12(1), 17-28, 2006.

11.
Borg, G. A., Perceived exertion as an indicator of somatic stress, Scand. J. Rehabil. Med., 2, 92-98, 1970.

12.
Corlett, E. N. and Bishop, R. P., A technique for measuring postural discomfort, Ergonomics, 9, 175-182, 1976.

13.
Konrad, P., The ABC of EMG: A practical introduction to kinesiological electromyography. Version 1.0. Apr 2005. Noraxon, Inc, USA.

14.
NIOSH, Selected topics in surface electromyography for use in the occupational setting: Expert perspectives. U.S. Department of Health and Human Services, Centers for Disease Control, March 1992.

15.
Wakula, J., Beckman, T., Hett, M. and Landau, K., Ergonomic analysis of grapevine pruning and wine harvesting to define work and hand tools design requirements, Occup Biomech, 2, 151-161, 2000.