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                        ==ELECTROGASTROGRAPHY==

4
AUTHOR                    Kjellberg A
AUTHOR                    Wikstrom B-O
TITLE                     Acute Effects of Whole-Body Vibration.
                          Stabilography and Electrogastrography
SOURCE                    Scandinavian Journal of Work, Environment and
                          Health, Vol. 13, No. 3, pages 243-246, 18
                          references, 1987.
ABSTRACT                  Stabilographic responses before and after a
                          64 minute exposure to stochastic vibration of
                          either 3 or 6 hertz (Hz) at levels commonly
                          encountered in the workplace were
                          investigated.  Additionally, the possibility
                          of using electrogastrograms to measure
                          gastrointestinal effects of whole body
                          vibration was studied.  Fifteen volunteers
                          were subjected to vibrational stress induced
                          by an electrohydraulic shaker vibrated in the
                          vertical direction.  Subjects sat on a
                          conventional drivers seat with a thin cushion
                          present, but with no other spring or
                          dampening system.  A force platform measured
                          forces in three directions during generation
                          of stabilographic information.  For
                          electrogastrography, one
                          silver/silver-chloride electrode was placed
                          on the skin above the antrum, and a ground
                          wire was attached to the right leg slightly
                          above the ankle.  Stabilographic recordings
                          made before and 1 minute and 15 minutes after
                          vibration exposure indicated that such
                          vibrational frequencies as used in these
                          studies did not effect postural control.
                          Electrogastrography measurements indicated
                          that vibration at 6Hz was associated with a
                          significant increase in gastric electrical
                          activity at 0.05 and 0.13Hz.  The authors
                          conclude that these results imply an effect
                          upon stomach motility caused by whole body
                          vibration within certain frequency ranges.