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  • 1
    Electronic Resource
    Electronic Resource
    Simultaneous recording of circular and longitudinal muscle contractions of the canine jejunum (1976)
    Springer
    Pflügers Archiv 363 (1976), S. 273-274 
    Details
    ISSN: 1432-2013
    Keywords: Intestinal motility ; circular contractions ; longitudinal contractions ; movement transducer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A method has been developed for monitoring the mechanical activities of individual longitudinal and circular muscles in a 5 millimeters long segment of intact intestine in the anesthetized dog. The longitudinal contractions were recorded by means of a new movement transducer. The circular contractions were recorded simultaneously using a water-filled intraluminal balloon A precise separation of longitudinal and circular motor activities was obtained with this method. The two muscle layers manifested motor activity most of the time, but their contractions were out of phase. Phase locking was observed only during short periods of time. The contractions were then sequential, the circular one being first.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00594615
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Myoelectrical activity and intraluminal flow in human sigmoid colon (1986)
    Springer
    Digestive diseases and sciences 31 (1986), S. 1331-1337 
    Details
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Myoelectric spike bursts were recorded in the sigmoid colon by means of an intraluminal silastic tube equipped with 3 Ag−AgCl ring electrodes fixed 15 cm apart on the tube that was introduced by flexible sigmoidoscopy. In six subjects, the tube was also equipped with three catheters whose tip opened 1 cm aborad from each electrode, for pressure recordings. In six other subjects, the tube was equipped with both electrodes and a catheter opening at the tip of the probe for infusing fluids at a rate of 12 ml/min into the colonic lumen. The fluid was collected with another tube inserted in the rectum and the volume was measured at 1-min intervals. Colonic spiking activity was made of rhythmic stationary bursts (RSB) and of sporadic bursts that were either propagating (SPB) or not propagating (SNPB). All sporadic bursts were associated with intraluminal pressure waves whose amplitude was significantly higher than that associated with rhythmic bursts. In the infusion experiments, the volume of fluid collected did not change significantly whether rhythmic bursts were present or not (3.9±1.7 ml/min and 3.3±1.9 ml/min respectively) (mean±sd). However, the volume was significantly higher when sporadic nonpropagating bursts were present (9.4±4.1 ml/min), and even higher when the sporadic bursts were propagating (21.6±8.8 ml/min). These results indicate that (1) the occurrence of sporadic bursts, particularly when propagating, is associated with intraluminal pressure waves that lead to significant propulsive movements; and (2) rhythmic bursts do not seem to be involved in colonic propulsive activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299811
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Effects of rest, stress, and food on myoelectric spiking activity of left and sigmoid colon in humans (1988)
    Springer
    Digestive diseases and sciences 33 (1988), S. 614-618 
    Details
    ISSN: 1573-2568
    Keywords: colon ; motility ; rest ; stress ; food ; electromyography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The great variability which is known to affect colonic motility may partly be the result of changes in physiological conditions. In order to test this hypothesis, 40 subjects were sequentially put in conditions of vigilance, rest, stress, and feeding while colonic motility was monitored. The myoelectric spiking activity of the left colon was recorded with a 50-cm-long silastic tube equipped with four bipolar ring electrodes (located 10 cm apart) introduced into the left colon by flexible sigmoidoscopy. Tracings were performed while the subjects were kept awake (by conversation) for 1 hr, put at rest (quiet) for another 1 hr, submitted to a stress (by alternatively immersing and removing one hand from 2–4
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01798366
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Analogue automated analysis of small intestinal electromyogram (1982)
    Springer
    Medical & biological engineering & computing 20 (1982), S. 151-158 
    Details
    ISSN: 1741-0444
    Keywords: Automated analysis ; Intestinal electromyography ; Online measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The recording of intestinal electrical activity is used to study digestive motility. This activity consists of slow waves occurring at a frequency of 13–20 cycles per minute. The slow waves are sometimes superimposed with spike potentials. Different patterns of distribution of spike potentials on the slow waves have been shown to occur in physiological and pathological conditions, so that longlasting recording sessions are increasingly required. This presents the problem of analysis of large amounts of data that has not yet been resolved satisfactorily. We present herein an analogue automated system of analysis of the intestinal electrical activityin dogs. This system works in real time and provides online data recorded on a graphic recorder. A microcomputer controlled printer and tape recorder were also used. Slow waves are characterised both by the amplitude and the timing of occurrence of relative minima. The spike bursts are detected on the slow waves; their distribution on the slow waves is given, and their energy is measured. Thus, our system allows an easy analysis of long duration chronic recordings, qualitatively (distribution of the spike bursts on the slow waves) as well as quantitatively (time of occurrence of slow waves and number and energy of the spike bursts).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441350
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    Paper (German National Licenses)
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