Abstract
Six workers who had used chain-saws for about 5 to 6 years and suffered from repeated attacks of Raynaud's phenomenon were chosen and the changes of their peripheral circulatory functions, peripheral nerve functions and subjective symptoms were investigated before and after the introduction of bus survice for their daily transport.
The results revealed that, though the Raynaud's phenomenon per se subsided remarkably after stopping riding bicycles to the working spot, possibly by reducing the chance of inducing the phenomenon, the peripheral circulatory and nerve functions as well as other local and general symptoms still showed a tendency to get worse.
From the data, it is suggested that the occurrence of Raynaud's phenomenon may be attributed not only to the quantity but also to the quality of the induction risk. So we should pay attention to the persistent peripheral circulatory functions, considering it as one of the important diagnostic criteria for the diagnosis of vibration hazards irrespective of the existence or absence of the Raynoud's phenomenon.
