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Maximal Grip Force During Holding A Cylindrical Handle with Different Diameters

100%

Mastalerz A. , Nowak E. , Palczewska I. , Kalka E.

Human Movement

2009

tom 10

nr 1

26-30

Purpose. The purpose of the study was to estimate the effects of cylindrical handle diameter and handle position on maximal grip force in young males and females. Basic procedures. The maximal voluntary grip force perpendicular to the surface of the handle was estimated using a glove with 320 sensors (Tekscan, USA - GripTM System). Individual digit and palm forces were studied. Different handle diameters (20, 30, 40 and 50 mm) and handle positions (vertical, natural - vertical handle with 12 deg of ulnar deviation of the hand, and horizontal) were applied during measurement. Main findings. Using handles and hand tools frequently leads to the feeling of discomfort in daily life. In a longer term, using improper handles and hand tools may also cause musculoskeletal disorders. Poor wrist positioning and handle diameter can diminish grip strength. The ideal diameter and wrist position during holding a tool handle was determined for males and females using maximal grip strength measurements. The obtained results showed that a tool handle diameter of 20 to 30 mm is optimal for the general population. Further research should be carried out to estimate the impact of wrist positioning in the elderly. Conclusions. The handle positioning is not a significant factor influencing hand grip force capabilities for young men and women. The grip force of three digits did not significantly vary for different handle positions used in the study. The optimal handle diameter for maximal grip force was estimated to be between 20 and 30 mm, and the diameter was larger for men. On the basis of results for individual digits the 30 mm diameter was chosen as optimal for both sexes.

The relationship between hand anthropometrics, total grip strength and individual finger force for various handle shapes

51%

Kong Y. K. , Kim D.-M.

International Journal of Occupational Safety and Ergonomics

2015

tom Vol. 21, No. 2

187--192

The design and shape of hand tool handles are critical factors for preventing musculoskeletal disorders (MSDs) caused by the use of hand tools. We explored how these factors are related to total force and individual finger force in males and females with various hand anthropometrics. Using the MFFM system, we assessed four indices of anthropometry, and measured total force and individual finger force on various handle designs and shapes. Both total force and individual finger force were significant according to gender and handle shape. Total grip strength to the handle shape indicated the greatest strength with D shape and the least with A shape. From the regression analysis of hand anthropometric indices, the value of R was respectably high at 0.608–0.696. The current study examined the gender and handle shape factors affecting grip strength based on the force measurements from various handle types, in terms of influence on different hand anthropometric indices.