Gastric activity studies using a magnetic tracer

A magnetic pulse generator has been set up in order to study gastric activity. Two coils 1.05 m in diameter, arranged in a Helmholtz configuration, were used. The system generated magnetic field pulses higher than 15 mT, of duration 17.3+/-1.2 ms. Measurements were performed in 11 male volunteers, w...

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Bibliographic Details
Published in:Physiological measurement 2004-10, Vol.25 (5), p.1261-1270
Main Authors: Cordova-Fraga, T, Bernal-Alvarado, J J, Gutierrez-Juarez, G, Sosa, M, Vargas-Luna, M
Format: Article
Language:English
Subjects:
Adult
Body Mass Index
Eating
Humans
Magnetics
Male
Peristalsis - physiology
Stomach - physiology
Yogurt
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Summary:A magnetic pulse generator has been set up in order to study gastric activity. Two coils 1.05 m in diameter, arranged in a Helmholtz configuration, were used. The system generated magnetic field pulses higher than 15 mT, of duration 17.3+/-1.2 ms. Measurements were performed in 11 male volunteers, with average age 29.3+/-6.4 years and body mass index 26.0+/-4.8 kg m(-2). Magnetite (Fe3O4) particles with diameters from 75 to 125 microm were used as magnetic tracers, which were mixed in 250 ml of yogurt in concentrations from 2 to 5 g. Signals were registered by using a high speed 3 axis fluxgate digital magnetometer and processed to determine the relaxation of the magnetic tracers by fitting a first-order exponential function to the data, a mean relaxation constant K = 116+/-40 s(-1) was obtained. Also, an average gastric peristaltic frequency was measured; a value of 3.2+/-0.3 cpm was determined.
ISSN:0967-3334
1361-6579
DOI:10.1088/0967-3334/25/5/015