Peripheral Blood Circulation under the Influence of Occupational Exposure to Hand-Transmitted Vibration.
NIOSH 1977 Apr:21-36
A study was made of peripheral blood circulation under the influence of occupational exposure to hand transmitted vibration. Changes in skin blood circulation in human subjects were examined by occlusive plethysmography, rheography, thermometry, sphygmography, and capillaroscopy. Decrease of skin blood flow in fingers to 6.3 milligrams per 100 grams of tissue per minute, an increase in peripheral resistance, and a drop of skin temperature were observed. This confirmed an observed increase in skin arterioles tonus. Also observed was an increase of rheographic quotient by 50 percent, and the basic time of the pulse wave was prolonged by 27 percent. Also observed was a drop of pulse wave velocity by 10 percent, indicated by a lowering of tonus of the muscular and elastic vessels. During functional thermal testing, the controls reacted by opposing changes in cutaneous and muscular circulation; the vibration exposed group did not show this reaction. Disorders of thermoregulating function of skin circulation seem to be the cause of vibration disease. Changes observed increased with work duration, but individual sensitivity is decisive. The manner of work and of using the tool modifies the effects of exposure. Higher values of threshold of vibration sensitivity in women indicate the importance of sex differences.
Cardiovascular-system-disorders; Physiological-response; Vibration; Shaking; Torsional-vibration; Nervous-system-disorders; Dead-finger; Raynauds-phenomenon; Sensory-perceptual-processes; Vibration-perception; Sex-factors; Construction-Search
Special Populations; Work Environment and Workforce;
Proceedings of the International Occupational Hand-Arm Vibration Conference, NIOSH, (Paper presented at Cincinnati, Ohio, October 28-31, 1975), Cincinnati, Ohio, DHEW (NIOSH) Publication No. 77-170