Myoelectrical activity of gastric antrum in conscious piglets around weaning

2000 ◽  
Vol 80 (4) ◽  
pp. 577-584 ◽  
Author(s):  
Violetta Lesniewska ◽  
Helle N. Lærke ◽  
Mette S. Hedemann ◽  
Bent B. Jensen ◽  
Søren Højsgaard ◽  
...  
Keyword(s):  
Electrical Response ◽  
Cyclic Activity ◽  
Gastric Myoelectrical Activity ◽  
Control Activity ◽  
Myoelectrical Activity ◽  
Bipolar Electrodes ◽  
Food Standard ◽  
Before And After ◽  
Dry Food ◽  
Conscious Animals

We investigated gastric myoelectrical activity in piglets around weaning. The study was carried out on the same piglets before and after weaning. Before weaning, the piglets were kept with their littermates and nursed by the sow, then they were weaned on solid dry food (standard concentrate for weaning pigs) and fed three times a day. Gastric myoelectrical activity was recorded in conscious animals using bipolar electrodes implanted on the wall of the terminal antrum. A cyclic activity pattern of the antral region in the stomach was present in both suckling and weaned piglets and consisted of quiescence and an activity phase. Sow's milk under nursing conditions significantly decreased the frequency of response potentials in ERA (electrical response activity). However, milk did not influence the basic electrical rhythm (BER) i.e., frequency of ECA (electrical control activity) and did not affect the periodicity of the cyclical activity. After weaning, ingestion of solid feed increased the BER, the frequency of ERA and the frequency of response potentials of ERA and slightly affected the periodicity of the cyclical activity. Key words: Gastric terminal antrum, piglet, weaning, electromyography

The effect of change of the diet and feeding regimen at weaning on duodenal myoelectrical activity in piglets

2000 ◽  
Vol 71 (3) ◽  
pp. 443-451 ◽  
Author(s):  
V. Lesniewsk ◽  
H. N. Lærke ◽  
M. S. Hedemann ◽  
S. Højsgaard ◽  
S. G. Pierzynowski ◽  
...  
Keyword(s):  
Phase Ii ◽  
Electrical Response ◽  
Experimental Period ◽  
Phase Iii ◽  
Cycle Duration ◽  
Myoelectrical Activity ◽  
Bipolar Electrodes ◽  
Before And After ◽  
Feeding Regimen ◽  
Dry Food

AbstractThis study investigated the effect of the change of diet and feeding regimen at weaning on myoelectrical activity of the intestine of piglets. For this purpose the electromyographic recordings of duodenal myoelectrical activity were carried out in relation to the different weaning status of piglets. Six piglets, in two experimental trials were surgically modified with two serosal, bipolar electrodes on the duodenum. The myoelectrical activity was recorded in the same piglets before weaning when they were sucking their sow and after weaning when the diet was changed to solid dry food (standard commercial concentrate for weaned pigs). In sucking piglets the intestinal myoelectrical activity pattern exhibited triple-phased migrating myoelectric complex (MMC), undisturbed by sow nursing. After weaning, feeding with solid food induced a long-term post-prandial pattern with higher frequency of electrical response activity (ERA) when compared with phase II of the MMC. The duration of the MMC cycles increased with time over the experiment by proportionately 0•11 and 0•14 in the periods before and after weaning. However, weaning significantly shortened MMC cycle duration by proportionately 0•21. The duration of phase II was significantly prolonged with time over the experiment by 0•07 to 0•10 and it was not affected by weaning. Phase III of MMC were of constant duration over the whole experimental period.In summary, changes in the diet and feeding regimen have an influence on the characteristics of intestinal myoelectrical activity in piglets around weaning.

Preservation and propagation of cyclic myoelectric activity after feeding in rat small intestine

1992 ◽  
Vol 263 (2) ◽  
pp. G248-G253 ◽  
Author(s):  
M. E. Zenilman ◽  
J. E. Parodi ◽  
J. M. Becker
Keyword(s):  
Small Intestine ◽  
Fourier Transforms ◽  
Myoelectric Activity ◽  
Proximal Jejunum ◽  
Cyclic Activity ◽  
Fed State ◽  
Bipolar Electrodes ◽  
Before And After ◽  
Significant Depression ◽  
Fft Analysis

The cyclic nature and distal propagation of the fasting migrating motor complex (MMC) of the small intestine have been well described. The fate of the MMC after feeding, however, has not been elucidated. We used time series analysis with fast Fourier transforms (FFT) to study myoelectric cycling before and after feeding. Ten rats were chronically prepared with bipolar electrodes secured to the duodenum and proximal jejunum. Spikeburst frequency was recorded before and after feeding simple nutrients. During fasting, cyclic activity occurred at the MMC frequency. Although after feeding this periodicity appeared disrupted, FFT analysis showed persistent cycling at the fasted (MMC) rate. Digital filtering of data at the MMC frequency isolated cycling from background noise during both fasted and fed states and showed a depression in the amplitude of the waveform after feeding. Root-mean-square analysis of the waveform confirmed statistically significant depression of amplitude by 47-57%. The waveform propagated from the duodenum to the jejunum during both the fasted and fed state at an unchanged rate. We conclude that factors controlling myoelectric cycling during the fasted state persist after feeding, allowing continued net abroad propulsion of food.

Patterns of gastric electrical and motor activity in miniature pigs

1976 ◽  
Vol 54 (5) ◽  
pp. 764-773 ◽  
Author(s):  
Claude Rozé ◽  
Daniel Couturier ◽  
Charles Debray
Keyword(s):  
Mechanical Activity ◽  
Gastric Myoelectrical Activity ◽  
Spike Response ◽  
Control Activity ◽  
Myoelectrical Activity ◽  
Standard Meal ◽  
Implanted Electrodes ◽  
Miniature Pigs ◽  
Pacesetter Potentials ◽  
Cyclic Control

Gastric myoelectrical and mechanical activity was recorded in miniature pigs using chronically implanted electrodes and strain gauge force transducers. Semiautomated methods were devised to obtain quantitative evaluations of the electrical and mechanical parameters measured in fasted and fed animals. The patterns of gastric myoelectrical activity in pigs were, on the whole, similar to the patterns described in dogs, including regular cyclic control activity and spike response activity associated with muscle contraction. However, several points were peculiar to the species studied: conduction velocity of pacesetter potentials increased only moderately in the antrum; tachygastria never occurred in the experiments; in response to a standard meal, the frequency of pacesetter potentials gradually increased; mechanical activity proceeded at its maximal force immediately after feeding and for a long period; no evidence of 'migrating electrical complexes' was found in the stomach during fasting. The 40-min period following administration of a test meal appeared especially suitable for pharmacological or physiological experiments in which inhibitory factors are to be tested on the stomach.

Transfer function analysis of heart rate variability in response to water intake: correlation with gastric myoelectrical activity

2004 ◽  
Vol 96 (6) ◽  
pp. 2226-2230 ◽  
Author(s):  
C. L. Chen ◽  
H. H. Lin ◽  
William C. Orr ◽  
Cheryl C. H. Yang ◽  
Terry B. J. Kuo
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Transfer Function ◽  
Water Intake ◽  
Function Analysis ◽  
Gastric Myoelectrical Activity ◽  
Myoelectrical Activity ◽  
Sinus Arrhythmia ◽  
Transfer Function Analysis ◽  
Before And After

We utilized transfer function analysis of heart rate variability (HRV) and respiration to investigate the effect of water intake on gastric myoelectrical activity and its relationship to vagal activity. The electrogastrography (EGG) and HRV were recorded simultaneously before and after drinking 500 ml of water in 10 healthy subjects. We observed good linearity between lung volumes and HRV signals at a ventilatory rate between 0.2 and 0.4 Hz before and after water intake. The EGG power of 3 cycles/min increased remarkably after the water intake. We found that there was a significant increase in the magnitude of the respiration-HRV transfer function after water intake ( P < 0.05). The EGG 3 cycles/min power was positively correlated with the transfer magnitude throughout the study ( r = 0.54, P = 0.01). These results confirm that transfer function analysis of HRV sensitively identifies subtle changes in the respiratory sinus arrhythmia that occurs with water intake. The present findings suggest that transfer function analysis of HRV and respiration after water intake can be used to evaluate vagal nervous activity in the human gut.

Serosal and cutaneous recordings of gastric myoelectrical activity in patients with gastroparesis

1994 ◽  
Vol 266 (1) ◽  
pp. G90-G98 ◽  
Author(s):  
J. D. Chen ◽  
B. D. Schirmer ◽  
R. W. McCallum
Keyword(s):  
Electrical Stimulation ◽  
Slow Wave ◽  
Test Meal ◽  
Frequency Change ◽  
Fasting State ◽  
Gastric Myoelectrical Activity ◽  
Myoelectrical Activity ◽  
Gastric Slow Wave ◽  
Student’S T ◽  
Student’S T Test

The aims of this study were to 1) investigate gastric myoelectrical activity in patients with gastroparesis, 2) validate the cutaneous electrogastrogram (EGG) in tracking the frequency change of the gastric slow wave, and 3) investigate the effect of electrical stimulation on gastric myoelectrical activity. Gastric myoelectrical activity was recorded in 12 patients with documented gastroparesis using serosal electrodes for > 200 min in each subject. All recordings were made at least 4 days after surgery. Each session consisted of a 30-min recording in the fasting state and a 30-min recording after a test meal. The test meal (liquid or mixed) was selected according to patient's tolerance. Electrical stimulation was performed in three subjects via the serosal electrodes at a frequency of 3 cycles/min. Gastric myoelectrical activity was recorded using serosal electrodes in each session. The serosal recording showed slow waves of 2.5 to 4.0 cycles/min in all 12 subjects. Absence of spikes was noted in 11 of the 12 subjects. The simultaneous serosal and cutaneous recording of gastric myoelectrical activity showed that the frequency of the EGG was exactly the same as that of the serosal recording. Liquid meals resulted in a significant decrease in slow-wave frequency (Student's t test, P = 0.006), and the EGG accurately reflected this change. Electrical stimulation had no effect on the frequency of the gastric slow wave and did not induce spikes.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Chronic intermittent hypoxia alters ventilatory and metabolic responses to acute hypoxia in rats

2016 ◽  
Vol 120 (10) ◽  
pp. 1186-1195 ◽  
Author(s):  
Barbara J. Morgan ◽  
Russell Adrian ◽  
Zun-yi Wang ◽  
Melissa L. Bates ◽  
John M. Dopp
Keyword(s):  
Intermittent Hypoxia ◽  
Acute Hypoxia ◽  
Sprague Dawley ◽  
Glomus Cell ◽  
Stimulus Response ◽  
Sprague Dawley Rats ◽  
Ventilatory Equivalent ◽  
Before And After ◽  
Conscious Animals ◽  
Carotid Body Glomus Cells

We determined the effects of chronic exposure to intermittent hypoxia (CIH) on chemoreflex control of ventilation in conscious animals. Adult male Sprague-Dawley rats were exposed to CIH [nadir oxygen saturation (SpO2), 75%; 15 events/h; 10 h/day] or normoxia (NORM) for 21 days. We assessed the following responses to acute, graded hypoxia before and after exposures: ventilation (V̇e, via barometric plethysmography), V̇o2 and V̇co2 (analysis of expired air), heart rate (HR), and SpO2 (pulse oximetry via neck collar). We quantified hypoxia-induced chemoreceptor sensitivity by calculating the stimulus-response relationship between SpO2 and the ventilatory equivalent for V̇co2 (linear regression). An additional aim was to determine whether CIH causes proliferation of carotid body glomus cells (using bromodeoxyuridine). CIH exposure increased the slope of the V̇e/V̇co2/SpO2 relationship and caused hyperventilation in normoxia. Bromodeoxyuridine staining was comparable in CIH and NORM. Thus our CIH paradigm augmented hypoxic chemosensitivity without causing glomus cell proliferation.

Effect of metoclopramide on gastric myoelectrical activity in patients with gastroparesis

1998 ◽  
Vol 114 ◽  
pp. A792
Author(s):  
Z.Y. Lin ◽  
R.W. McCallum ◽  
B.D. Schirmer ◽  
J.D.Z. Chen
Keyword(s):  
Gastric Myoelectrical Activity ◽  
Myoelectrical Activity
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