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Evaluation of handle diameters and orientations in a maximum torque task.

Authors
Kong-Y-K; Lowe-BD
Source
Int J Ind Ergon 2005 Dec; 35(12):1073-1084
NIOSHTIC No.
20029139
Abstract
The effects of gender, handle diameter (25-50 mm), and handle orientation (horizontal and vertical) on the perceived comfort, torque, total finger force, and efficiency of flexor and extensor muscle activity were examined in a maximum torque task. A 16-force sensor glove system was applied to measure finger and phalangeal forces, and a surface EMG was recorded to investigate muscle activities in the torque task. Average maximum torque in the horizontal orientation was about 23.4% more than that in the vertical orientation. The maximum torque was the largest with the 45 and 50 mm diameter handles and least with the 25 mm diameter handle. In both orientations, torque increased as the handle diameter increased, whereas total finger force showed a decreasing pattern which can explain the positive and non-linear correlation between torque output and handle diameter. The efficiency of muscle activity in both orientations followed a similar trend with the torque output for the handle diameters (i.e., the efficiency increased when the handle diameter increased). 35-45 mm handles were rated as the most comfortable for maximum torque exertions. According to a polynomial regression, 37-44 mm and 41-48 mm diameter handles (23.3% of the user's hand length) maximized perceived comfort and were thus recommended for females and males, respectively in this study.
Keywords
Demographic-characteristics; Sex-factors; Muscles; Muscle-function; Gloves; Hand-injuries; Hand-protection; Anthropometry
Contact
Robert A. Taft Laboratories, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, MS C-24, Cincinnati, OH 45226, USA
Publication Date
20051201
Document Type
Journal Article
Email Address
ykong@cdc.gov
Funding Type
Construction
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Issue of Publication
12
ISSN
0169-8141
NIOSH Division
DART
Priority Area
Disease and Injury: Musculoskeletal Disorders of the Upper Extremities
Source Name
International Journal of Industrial Ergonomics
State
OH
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