Abstract
The dynamic response of the human body exposed to vertical whole-body vibration has been investigated in an experiment involving human subjects. The apparent mass showed a principal resonance at a frequency around 5 and 6Hz for standing and seated subjects. Bending of the lumber spine at the principal resonance frequency has been illustrated based on the measurement of the transmissibilities. An investigation of mathematical models showed a possible major contribution of the vertical motion of the viscera to the principal resonance of the apparent mass for standing and seated subjects. For the seated body, deformation of the tissue beneath the pelvis may also make a major contribution to the resonance.
