[Resonance frequencies of vibration in rats]

Using piezoelectric transducers, resonance frequencies of different body parts of rats exposed to whole-body vertical vibration were measured. The exposure was as follows: acceleration--8 m/sec2, head--75-80 Hz, chest 225-230 Hz, and abdomen--27-29 Hz. An attempt was made to determine roughly an interspecies (man-rat) coefficient with respect to resonance frequencies which was estimated to be 0.2-0.25.