[Selection of the psychophysiological criterion for evaluating whole-body low-frequency vibration].

In response to whole-body vibration of 10 Hz and acceleration of 1 m/sec2 applied for 1 hour the psychophysiological status varies in two stages. At stage 1 physiological functions are disturbed (primary disorder) and at stage 2 they recover partially or completely (compensation and adaptation). The level of compensatory and adaptive reactions can be used as a tolerance criterion of the vibration effect with respect to its magnitude and duration. The primary reaction can be used as such a criterion when the functions under study are exposed to direct biomechanical effects of vibration.