Objectives-To investigate changes in digital circulation during and after exposure to hand transmitted vibration.
By studying two frequencies and two magnitudes of vibration, to investigate the extent to which haemodynamic changes depend on the vibration frequency, the vibration acceleration, and the vibration velocity.
Methods-Finger skin temperature (FST), finger blood flow (FBF), and finger systolic pressure were measured in the fingers of both hands in eight healthy men.
Indices of digital vasomotor tonesuch as critical closing pressure and vascular resistance-were estimated by pressure-flow curves obtained with different hand heights.
With a static load of 10 N, the right hand was exposed for 30 minutes to each of the following root mean squared (rms) acceleration magnitudes and frequencies of vertical vibration : 22 m. s-2 at 31.5 Hz, 22 m. s-2 at 125 Hz, and 87 m. s-2 at 125 Hz.
A control condition consisted of exposure to the static load only.
The measures of digital circulation and vasomotor tone were taken before exposure to the vibration and the static load, and at 0,20,40, and 60 minutes after the end of each exposure.
Exposure to static load caused no significant changes in FST, FBF, or indices of vasomotor tone in either the vibrated right middle finger or the non-vibrated left middle finger.
In both fingers, exposure to vibration of 125 Hz and 22 m. (...)
Mots-clés Pascal : Main, Trouble dû aux vibrations, Hémodynamique, Vaisseau sanguin pathologie, Fréquence, Vibration, Accélération, Vitesse, Débit sanguin, Température superficielle, Doigt, Pression systolique, Exposition professionnelle, Appareil circulatoire pathologie, Médecine travail, Homme
Mots-clés Pascal anglais : Hand, Vibration induced disorder, Hemodynamics, Vascular disease, Frequency, Vibration, Acceleration, Velocity, Blood flow, Surface temperature, Finger, Systolic pressure, Occupational exposure, Cardiovascular disease, Occupational medicine, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0464097
Code Inist : 002B16I. Création : 03/02/1998.