Whole-Body Vibration Suppresses Gastric Motility in Healthy Men.

Abstract

The influence of whole-body vibration on gastric motility was investigated by using an electrogastrography (EGG) in seven healthy men. The EGG is usually referred to as a noninvasive technique of recording gastric myoelectrical activity by means of placing electrodes on the abdominal surface. Sinusoidal vertical vibration at each of 3 different frequencies (10 Hz, 20 Hz, 40 Hz) were randomly given to the subject seated on a platform of vibrator for 5 min. The vibration magnitude was kept at a constant of 2.0 msec-' (r.m.s.) during operation. The mean dominant frequency of EGG at control period was prior to operation 3.3 cycles per min (cpm). During vibration exposure at 10 Hz, the peak of dominant frequency increased to 3.9 cpm, and the relative power of slow wave showed the statistically significant decrease (45.8%, p<0.05). The mean relative power of slow wave which is composed of frequencies ranged from 2.0 to 5.0 cpm was 56.6% at control period. On the contrary the mean relative power of frequencies ranging from 5.0 to 9.0 cpm, tachygastria increased from 29.5 % to 39.1 %. These results suggest that the short-term exposure to whole-body vibration effects on the gastric myoelectrical activity.

Effects of Short-Term Exposure to Whole-Body Vibration on Wakefulness Level

“…and as to whole-body vibration impediment, many investigations about the effects of the spine on a driver are made in Europe and America [1][2][3][4] . On the other hand, there are quite a few studies on the effects of a circulatory organ system, a respiratory-organs system, and a digestive organ system [5][6][7][8][9] . Until now in our country, there is no full-scale investigation for the health disorders among workers who were occupationally exposed to whole-body vibration, there are a few investigations about some of forklift workers and taxi drivers [10][11][12] .…”

Evaluation of Frequency Weighting (Iso 2631-1) for Acute Effects of Whole-Body Vibration on Gastric Motility

“…However, the e!ect of short-term WBV exposure may not be so strong because normal subjects have a normal rhythm for more than 70% of the time [12]. There have been reports of a change of magnitude in the power spectrum during WBV exposure [6,7,13]. Kjellberg and WikstroK m [6] observed a biphasic phenomenon which initially increased and then gradually decreased the power spectral density at frequencies of 3 cpm due to 3 Hz WBV.…”

“…Kjellberg and WikstroK m [6] observed a biphasic phenomenon which initially increased and then gradually decreased the power spectral density at frequencies of 3 cpm due to 3 Hz WBV. Ishitake et al [7,13] have also reported that a short-time exposure to WBV can reduce the power spectral density of the normal rhythm component. Although these results imply that gastric contraction can be a!ected by WBV, there is no further information on gastric motility.…”

“…It remains to be seen whether exposure to WBV is a speci"c risk factor for functional disorders associated with abnormalities of gastric motility, such as gastric neurosis and non-ulcerative dyspepsia [5]. Although there have been several experimental studies on the e!ects of acute exposure to WBV on human gastric motility in healthy subjects, the "ndings have been inconsistent [6,7]. The actual e!ects of WBV exposure on gastric motility thus remain unclear.…”

Valores de impacto no corpo do judoca ao ser projetado pela técnica Ippon-Seoi-Nage

“…Uma das preocupações referentes aos impactos sofridos na região do quadril é o acometimento de danos nos órgãos internos, situados na região do abdômen e quadril, os quais possuem maior sensibilidade em faixas de frequência baixas de 4 a 8 Hz (Harris & Piersol, 2002;Ishitake, Kano, Miyazaki, Ando, Tsutsumi, & Matoba, 1998). Segundo Sterkowicz (1999), os ataques inesperados no judô podem provocar danos corporais principalmente durante a projeção e a queda na região posterior do sacro.…”