[Changes in the thermographic picture of hands of healthy persons after vibrations of 125 Hz].

Abstract

The author investigated the effects of vibration, 125 Hz, on blood supply of hands in 43 healthy students. The temperature of fingers was followed by thermovision camera, the source of vibrations was a specially constructed vibration simulator which enabled to change vibration frequency. Thermographic recordings were made before the vibrations, immediately after the vibrations, 30 and 60 min. after the vibrations, respectively. Maximum temperature changes were always observed 60 min. after the vibrations. The temperature gradient 3-5 degrees C between the back of the palm and the fingers was demonstrated 60 min. after the vibrations in five healthy students (11%), although there was not any temperature gradient before the vibrations there. The negative finding lasted even in repeated examinations, the positive one was sometimes of different nature.