Whole-body vibration perception thresholds of recumbent subjects--Part 1: Supine posture

The objective of the present study was to determine perception thresholds for whole-body vibration in the recumbent supine posture in vertical and horizontal directions and to compare the present results with ones obtained at the same laboratory in 1984 and also with ISO frequency weighting curves both in ISO 2631-1 and in ISO 2631-2. The frequency characteristic and thresholds values of the present results are similar to previous results. Weighting curves of ISO, however, show quite different characteristic in both vertical and horizontal directions compared to the present characteristics. It is not suitable to apply weighting curves Wk for the vertical direction, Wd for the horizontal direction and combined curves in ISO to recumbent posture from the results of this present study.