Author: Ishitake T. Miyazaki Y. Noguchi R. Ando H. Matoba T.
Publisher: Academic Press
ISSN: 0022-460X
Source: Journal of Sound and Vibration, Vol.253, Iss.1, 2002-05, pp. : 31-36
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Abstract
The aim of this study was to investigate the effects of exposure to whole-body vibration (WBV) and the ISO 2631/1-1997 frequency weighting on gastric motility. The gastric motility was measured by electrogastrography (EGG) in nine healthy volunteers. Sinusoidal vertical vibration at a frequency of 4, 6⋅3, 8, 12, 16, 31⋅5, or 63 Hz was given to the subjects for 10 min. The magnitude of exposure at 4 Hz was 1⋅0m/s2 (r.m.s.). The magnitudes of the other frequencies gave the same frequency-weighted acceleration according to ISO 2631/1-1997. The pattern of the dominant frequency histogram (DFH) was changed to a broad distribution pattern by vibration exposure. Vibration exposure had the effect of significantly reducing the percentage of time for which the dominant component had a normal rhythm and increasing the percentage of time for which there was tachygastria (
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