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Hand breakaway strength model-effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation.

Authors
Hur-P; Motawar-B; Seo-NJ
Source
J Biomech 2012 Apr; 45(6):958-964
NIOSHTIC No.
20041157
Abstract
This study developed biomechanical models for hand breakaway strength that account for not only grip force but also hand-handle frictional coupling in generation of breakaway strength. Specifically, models for predicting breakaway strength for two commonly-used handle shapes (circular and rectangular handles) and varying coefficients of friction (COF) between the hand and handle were proposed. The models predict that (i) breakaway strength increases with increasing COF and (ii) a circular handle with a 50.8 mm-diameter results in greater mean breakaway strength than a handle with a rectangular cross-section of 38.1 by 38.1 mm for COFs greater than 0.42. To test these model predictions, breakaway strengths of thirteen healthy young adults were measured for three frequently-encountered COF conditions (represented by three glove types of polyester (COF=0.32), bare hand (COF=0.50), and latex (COF=0.74) against an aluminum handle) and for the two handle shapes. Consistent with the model predictions, mean breakaway strength increased with increasing COF and was greater for the circular than rectangular handle for COFs of 0.50 and 0.74. Examination of breakaway strength normalized to body weight reveals that modification of COF and handle shapes could influence whether one can hold his/her body using the hands or not (thus must fall), highlighting the importance of considering these parameters for fall prevention. The biomechanical models developed herein have the potential to be applied to general handle shapes and COF conditions. These models can be used to optimize handle design to maximize breakaway strength and minimize injuries due to falls from ladders or scaffolds.
Keywords
Humans; Men; Women; Models; Biomechanics; Biomechanical-modeling; Biological-factors; Hand-tools; Hand-protection; Gloves; Physiology; Physiological-function; Musculoskeletal-system
Contact
Na Jin Seo, Department of Industrial and Manufacturing Engineering, University of Wisconsin-Milwaukee, 3200 N, Cramer Street, Milwaukee WI 53211
CODEN
JBMCB5
Publication Date
20120405
Document Type
Journal Article
Email Address
seon@uwm.edu
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-T42-OH-008672; B08012012
Issue of Publication
6
ISSN
0021-9290
Source Name
Journal of Biomechanics
State
IL; WI
Performing Organization
University of Illinois at Chicago
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