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Hand-Arm Vibration (HAV) is defined as the transfer of vibration from a tool to
a worker’s hand and arm. The vibration is typically measured on the handle of
the tool, while in the grasp of the worker, and the amount of HAV is a function
of the acceleration levels transferred to the worker.
Vibration restricts the blood supply to the hands and fingers. Signs and
symptoms of vibration-induced injury, such as Reynaud’s phenomenon, start with
occasional numbness or loss of color in the fingertips. This progresses to more
frequent and persistent symptoms affecting a larger area of the fingers and
resulting in reduction in feeling and manual dexterity.
Recommendations for managers and workers for minimizing the injury risk from
HAV:
Management
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Train workers to recognize the warning signs of HAV.
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Medically monitor workers who routinely use products associated with HAV.
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Institute health care management practices ensuring early detection of hand/arm
vibration disorders.
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Purchase new vibration-reduced pneumatic tools.
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Inspect and service tools at regular intervals in accordance with manufacturer
instructions.
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Repair or replace tools producing high vibration levels due to wear and tear.
Workers
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Wear protective clothing to reduce the transmission of vibration energy to the
hands and to protect the hands against exposure to cold.
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In cold weather, dress adequately to keep the whole body warm, since a low body
temperature can make you more susceptible to HAV.
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Wear multiple layers of warm gloves, or anti-vibration gloves, whenever
possible, when using vibrating hand-held tools.
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Take more rest breaks when using tools with the highest vibration levels.
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Take a 10-minute break after each hour of continuously using a vibrating tool.
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Let the tool do the work by grasping it as lightly as possible, consistent with
safe work practice.
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Keep chisels and chainsaws sharp to reduce vibration. Using new grinder wheels
will also reduce vibration.
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Operate the tool at the minimum speed (and impact force) to reduce vibration
exposure.
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Substitute a manual tool or other process where practical.
COPYRIGHT ©2002, ISO Services, Inc.
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