The Japanese Journal of Ergonomics
Online ISSN : 1884-2844
Print ISSN : 0549-4974
ISSN-L : 0549-4974
Effect of the whole body vibration to the infants on a cradle
Yoko EMORIKazuo AOKIYoshiyuki YOSHIDA
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1995 Volume 31 Issue 6 Pages 369-377

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Abstract

The purpose of this study is to evaluate the influence of the whole body vibration to the infants on a cradle. Fifty-four normal healthy infants were exposed to horizontal whole body vibration in the Z-axis for 5 minutes. A sine wave vibration with the frequency of 1Hz, amplitude of 55mm and acceleration level of 1.0m/s2 was used for stimulus to infants.
The results are summarized as follows: (1) The infants stopped crying rapidly by the vibration exposure. (2) During vibration exposure, heart rate, peripheral body temperature and CVR-R decreased, and respiration rate on infants increased in crying infants. (3) Peripheral body temperature and CVR-R decreased, and respiration rate increased in drawzing or sleeping infants. (4) The vibration not only showed the sedative effect on crying infants, but also became a strong stimulus to awake on sleeping infants.
It is supposed that the intensity of vibration stimuli used in this study was strong enough to stop the infants crying but is too strong for the drawzing or sleeping infants because it induce them arousal.

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