HAVS
In occupational safety and health, hand arm vibrations (HAVs) are a specific type of occupational hazard which can lead to hand–arm vibration syndrome (HAVS). HAVS, also known as vibration white finger (VWF) or dead finger, is an industrial injury triggered by continuous use of vibrating hand-held machinery and constituting a secondary form of Raynaud's syndrome. Use of the term vibration white finger has generally been superseded in professional usage by the broader descriptor HAVS, although it is still used by the general public. The symptoms of vibration white finger are the vascular component of HAVS.
Hand-arm vibration syndrome is a widespread recognized industrial disease affecting tens of thousands of workers. It is a disorder that affects the blood vessels, nerves, muscles, and joints of the hand, wrist, and arm. Its best known effect is vibration-induced white finger (VWF), a term introduced by the Industrial Injury Advisory Council in 1970. Injury can occur at frequencies between 5 and 2000 Hz but the greatest risk for fingers is between 50 and 300 Hz. The total risk exposure for hand and arm is calculated by the use of ISO 5349-1, which stipulates maximum damage between 8 and 16 Hz and a rapidly declining risk at higher frequencies. The ISO 5349-1 frequency risk assessment has been criticized as corresponding poorly to observational data; more recent research suggests that medium and high frequency vibrations also increase HAVS risk.
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