Original Article

Evaluating Inappropriate Tool Application Damages for Left-Handers

Abstract

15% of world population are Left-handed people. Dominance of right brain hemisphere causes dominance of left side of their bodies also known as left handedness as a minority group. This group differs in some of their motor attributes compared to right-handed majority. This issue is more tangible when it comes to working with tools that requires reasonable degree of precision or power. It is essential to prevent permanent damages with aid of ergonomics principles. The purpose of this research was to examine and highlight the extra stress imposed on the left handers using the tools designs solely designed for right handers and further to come up with suggested solutions. The research was conducted based on user-centered methodology utilizing questionnaire, field observation and interview with users as well as extensive laboratory experiments on left-handed individuals. At first, left-handed samples were selected by Edinburgh “Hand Dominance” survey and then in second survey, a can opener and scissors were identified as the most challenging kitchen tools. The fatigue and tension in the muscles were measured via Electromyography (EMG) tests on the sampled left-handed and right-handed users working with scissors and can openers within the established experiment setting. Finally, the top three proposed design for future can openers were evaluated using AHP methodology and the best design concept was selected. This research highlights significance of considering left-handed people as a minority group of users that demands particular attention in design process of products.

Pheasant, S. T., Human, Anthropometry, Ergonomics and Design, Translated by Choobineh and Mououdi, 1st ed., Sadi Publishing,Tehran, Iran, 1996
2. Yaghoubifard, S., Right-handed and left-handed, unknowns and abilities, 1st ed., Moalef Publishing, Tehran, Iran, 2005
3. Azarova, E., Galina, N. and Zhulina, E. G., Speech perception by left-handed preschoolers with different types of hemispheric laterality. Procedia-social and behavior sciences, 2016; 233: 486-491
4. Schmauder, M., Eckert R. and Schindhelm, R., In the hand-arm system: Investigations of problem of left-handedness, International Journal of Industrial Ergonomics, 1992; 12:231-237
5. Mortazavi, M., Comparison of basketball free throw accuracy in left-handed and right-handed female students, Master thesis, Azad Islamic University of Eslamshahr , Eslamshahr, Iran, 2013.
6. Pehkonen, I., Takala, E.P., Ketola, R., Juntura, E., Arjas, P., Hopsu, L., Virtanen, T., Haukka, E., Leino, M., Nykyri, E. and Riihimaki, H., Evaluation of a participatory ergonomic intervention process in kitchen work,. Applied Ergonomics, 2009; 40 :115.
7. Razavi M., Falahi, M., Hekmatshoar, R. and Akaberi, A., Evaluation of musculoskeletal disorders and its related factors among housewives, Journal of Medical Sciences and Health Services Sabzevar, 2012; 4 :395-402.
8. Amiri, F. and Karimi, Y., A., Study of Musculoskeletal Disorders and Related Factors among Housewives, First National Conference on Promoting Women's Health and the Workplace 2012.
9. Marsot, J. and Claudon, L., Design and ergonomics. Methods for integrating ergonomics at hand tool design stage, International Journal of Industrial Ergonomics, 2007; 10 (1):13–23.
10. Kuijt-Evers, L F.M. and Vink, M.P., Comfort predictors for different kinds of hand tools: Differences and similarities, International Journal of Industrial Ergonomics, 2007; 37:73-84.
11. Mououdi, M.A., Khalaji, A. and Javidpour, M., Ease of use of hand tools with ergonomic approach, 1st ed., Faravaran Publishing,Tehran, Iran,2012.
12. Mououdi M. A. and Choobineh, A., Ergonomics in practice, selected ergonomics articles, 1st ed., Mansouri Publishing, Tehran, Iran, 1999.
13. Formosa, D., See mee fell me touch me peel me” the design of good grips kitchen tools. Design Management Journal, 1996; 31: 371-376.
14.Sohrabi, M., The effect of non-power hand tool diameter on the comfort and maximum torque produced by the hand, Journal of Iranian Society of Ergonomics and Human Factors Engineering, 2016; 2: 25-34.
15. Taherioun Esfahani, F., Design of kitchen hand tools with a user-centered approach, Master's thesis, Univesity of ElmoSanat, Tehran, Iran, 2016.
16. Sanders, M. & Mc. Cormic, E. J., Human Factors in Engineering and Design, translated by Afzali, 7th ed., University Science Publications, Tehran, Iran, 1999.
17. Naslseraji, J., Dehghan, S., Karchani, M., Ahmadinejad, P., Omidvar, M., Salehi, A., Zare, S. and Ahmadi, S., Handbook of Ergonomic Methods and Human Factors, 1st ed, Fan Avaran Publishing,Tehran, Iran, 2013.
Files
IssueVol 12 No 4 (2020) QRcode
SectionOriginal Article(s)
Published2020-12-16
Keywords
Left-Handed Ergonomics Design of Tools User Centered Methodology Electromyography

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
How to Cite
1.
Baghaee H, Hojjati Emami K, Nedaei Fard A. Evaluating Inappropriate Tool Application Damages for Left-Handers. Int J Occup Hyg. 12(4):310-326.