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Risk of vibration-induced vascular injuries linked to vibration frequency differences
Date:4/19/2009

Speaking on April 19 at the Experimental Biology 2009 meeting in New Orleans, Dr. Kristine Krajnak, a team leader in the Engineering and Control Technologies Branch of the Health Effects Laboratory Division of NIOSH in Morgantown, West Virginia, describes results from the first study to directly link the different physical responses of tissue that occur with exposure to different vibration frequencies with biological mechanisms underlying the development of vascular dysfunction. Her presentation is part of the scientific program of The American Physiological Society.

The study, along with results of other studies conducted by NIOSH, supports the importance of reducing job-related exposure to vibration. Ongoing research is evaluating the effectiveness of anti-vibration devices, such as anti-vibration gloves and tools.

Higher frequency vibrations produced by an electric sander (greater than 100 Hz) are smoother than the slower vibrations of an electric hand drill (approximately 63 Hz) and therefore are less likely to cause users discomfort.

Don't let that fool you into not using protective devices that can reduce your exposure to vibration, she says. The new research study conducted at the National Institute for Occupational Safety and Health (NIOSH) suggests that exposure to high and low frequencies cause different physiological responses, but both may affect the risk of developing vibration-induced peripheral vascular dysfunction.

Of the 1.1 to 1.5 million U.S. workers exposed to hand transmitted vibration on a fairly regular basis, approximately half eventually develop some disorder such as Vibration White Finger, in which a single finger or sometimes the entire hand turns white and numb when exposed to the cold, due to restricted blood flow.

Workers also may experience reductions in tactile sensitivity, grip strength, and/or manual dexterity. Earlier studies have shown that risk goes up with frequency and dura
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Federation of American Societies for Experimental Biology
Source:Eurekalert

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