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Distribution of mechanical impedance at the fingers and the palm of the human hand.

Authors
Dong-RG; Wu-JZ; McDowell-TW; Welcome-DE; Schopper-AW
Source
J Biomech 2005 May; 38(5):1165-1175
NIOSHTIC No.
20026617
Abstract
A comprehensive understanding of the complex biodynamic response of the human fingers-hand-arm system may help researchers determine the causation of injuries arising from hand-transmitted vibration. This study theoretically demonstrates that the mechanical impedance (MI) in a hand power grip, as a measure of the biodynamic response of the system, can be divided into finger MI and palm MI. A methodology is developed to measure them separately and to investigate their distribution characteristics. This study involves 6 adult male subjects, constant-velocity sinusoidal excitations at 10 different discrete frequencies (16, 25, 40, 63, 100, 160, 250, 400, 630, 1000 Hz), and three different hand-handle coupling conditions. Our results suggest that at low frequencies (40 Hz), the palm MI is substantially higher than the finger MI; the majority of the hand MI remains distributed at the palm up to 100 Hz; and at frequencies higher than 160 Hz, the finger MI is comparable to or higher than the palm MI. Furthermore, at frequencies equal to or above 100 Hz, the finger MI is practically independent of the palm-handle coupling conditions. Knowledge of the MI distribution pattern may increase the understanding of vibration transmission to the hand and aid in the development of effective isolation devices.
Keywords
Biodynamics; Hand-injuries; Arm-injuries; Vibration-effects; Vibration-exposure; Demographic-characteristics; Sex-factors; Humans
Contact
Engineering and Control Technology Branch, National Institute for Occupational Safety and Health, 1095 Willowdale Road, MS 2201, Morgantown, WV 26505, USA
CODEN
JBMCB5
Publication Date
20050501
Document Type
Journal Article
Email Address
rkd6@cdc.gov
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Issue of Publication
5
ISSN
0021-9290
NIOSH Division
HELD
Source Name
Journal of Biomechanics
State
WV
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