A Study on the Push and Pull Strength for the Design of Cart Handle

Title & Authors
A Study on the Push and Pull Strength for the Design of Cart Handle
Woo, Dong-Pil; Lee, Dong-Choon;

Abstract
Objective: Product design process without considering the strength of the user can cause the excessive burden on musculoskeletal system of human body. Since the muscle strength will vary depending on the body posture, the design of product should consider the characteristics of body posture. This study was performed to investigate the effects of forearm postures on the push and pull strength. Background: Overexerted force has been identified to cause musculoskeletal disorders. It is important to know the push and pull strength exerted by human when designing so that exerted force does not exceed the safety limits. Method: Maximum isometric push and pull strength of left, right and both hands were measured according to forearm postures with pronation, neutral and supination. For the study, 66 male and 30 female undergraduate students were participated as subjects. All subjects were normal and healthy with no clinical history. Results: The results showed that the push strength of male and female were 93.3% and 85.4% of pull strength. It showed that the strength of one-hand was 72.1~81.0% of the strength of two-hands, and the strength of left hand was 93.1~95.8% of the strength of right hand. The strength of female was 62% of the one of male. It was found that the strength with pronation $\small{90^{\circ}}$ was reduced up to 20% compared to the strength with neutral posture. Conclusion: Push and pull strength of male and female were reduced when forearm was rotated extremely. Application: The results of this study will be used for the prevention of work related musculoskeletal disorders and design of industrial equipment.
Keywords
Strength;Exerted force;MVC;Forearm posture;Pronation;Supination;
Language
Korean
Cited by
1.
수직형 손잡이와 수평형 손잡이의 높이와 간격에 따른 미는 힘 비교,송영웅;

대한안전경영과학회지, 2014. vol.16. 4, pp.371-378
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