The Influence of Mechanical Vibration and Noise on the Peripheral Blood Circulation at Skin Level.
International Association of Agricultural Medicine, Proceedings of the VII International Congress of Rural Medicine, Salt Lake City, Utah, September 17-21, 1978 1978 Sep:407-415
The effects of vibration and noise stress on skin temperature and circulatory parameters in the human hand were studied. Ten male subjects, average age 24.9 years, underwent 15 tests involving vibration and noise stress. The subjects were measured at rest and during the 8 minute stress test which followed. The noises used were white noise or noise at 100 decibels; the vibration tests involved various frequencies, accelerations, and arm positions and also involved hand grip and pressure. Skin heat conductivity (WL), skin temperature (HT), finger pulse amplitude (FPA), head pulse amplitude, and arterial blood pressure were monitored. The only conclusive measurements were FPA on the left index finger, WL on the middle right finger, and HT on the little finger of the right hand under vibration stress. Static loading significantly reduced peripheral blood flow and HT, but not WL. With the addition of vibration loading, the HT stayed at the same low level. FPA under static loading dropped, sometimes significantly, and always significantly when vibrational stress was added. Vibrational stress at 16, 63, or 125 hertz generally did not change the physiological parameters, but HT returned to normal with application of 1000 hertz. WL, FPA, and HT, related to skin circulation, changed increasingly as vibrational acceleration increased. Noise loading caused an initial decrease in WL and HT, significantly in FPA. The parameters gradually returned to normal, but FPA was still decreased 35 percent after 8 minutes. HT responded more to vibration stress and FPA more markedly to noise stress. The authors conclude that vascular constriction is produced more noticeably by noise, but decreased HT is the primary result of static force and vibration. Both stresses could produce peripheral vegetative problems, even after a short time.
NIOSH-Grant; Grants-other; Humans; Cardiovascular-system; Hemodynamics; Noise-exposure; Physiological-stress; Temperature-regulation; Vibration-effects; Laboratory-testing; Vibration-exposure;
Prev Med & Environmental Hlth University of Iowa Inst/agric Med & Environ Hlth Iowa Oakdale, Iowa 52319
Other Occupational Concerns; Grants-other;
International Association of Agricultural Medicine, Proceedings of the VII International Congress of Rural Medicine, Salt Lake City, Utah, September 17-21, 1978
University of Iowa, Iowa City, Iowa