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  • 1985-1989  (3)
  • manometry  (2)
  • Aggressive behavior  (1)
  • 1
    ISSN: 1432-2072
    Keywords: Tryptophan ; Aggressive behavior ; Motor activity ; Social isolation ; Dopamine ; Serotonin ; Tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study examined the interaction of dietary tryptophan (TRP) and differential housing on territorial-induced aggression, locomotor activity, and monoamine neurochemistry in mice. Groups of male CF-1 mice were singly-housed or group-housed and administered a semisynthetic basal diet supplemented with TRP (0.25–1.0%). Behavioral measures were taken at various intervals up to 2 weeks after dietary administration was instituted. Separate groups of mice were given the same experimental treatment and sacrificed for whole brain determination of the monoamines and their metabolites. Isolated mice were consistently more aggressive than grouped animals, suggesting that territorial-induced aggression is synergistic with intermale aggression based on social isolation. The combination of isolation and 0.50% TRP was particularly effective in producing increases in aggression that reached maximal levels after 10 days of diet administration. However, motor activity of singly-housed mice was unaffected by TRP, while that of grouped mice was decreased after 5 days of 0.50% TRP. By day 14 of administration behavioral changes tended to return to baseline levels. Neurochemical measures indicated increased DA and 5-HT turnover in isolated mice, with the 5-HT system most affected by dietary TRP. Because housing conditions were a prominent factor in the aggression and neurochemistry, the results suggest the involvement of both transmitter systems in this behavior. However, there were no changes in monoamine turnover that could account for the development of behavioral tolerance.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 33 (1988), S. 999-1006 
    ISSN: 1573-2568
    Keywords: colonic motility ; manometry ; strain gauge ; gastrointestinal motility ; dog recording
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The extent to which the established variability in colonic motility recordings is due to differences in recording techniques is not known. The aim of this study was to compare the ability of two intraluminal recording devices (perfused tube and tube mounted strain gauge) to record colonic motor activity against a reference device (serosal strain gauge). In six anesthetized dogs an intracolonic probe was positioned such that the component perfused tubes and tube mounted strain gauges were approximated to identical strain gauges mounted on the serosa. Contractions were induced by field stimulation and intraarterial injections of acetylcholine and carbachol. While both intraluminal devices demonstrated limitations in the detection of phasic and tonic motor events, perfused tubes detected a significantly greater proportion of tonic and phasic contractions than did strain gauges (P〈0.001). Intraluminal strain gauges misrepresented 50% of tonic contractions (confirmed visually and by serosal strain gauges) as waveforms with negative polarity. This was not seen in recordings from perfused tubes. Perfused tubes represented tonic contractions as biphasic or bifid waveforms significantly less frequently than strain gauges (P〈0.05). Radial asymmetry of colonie contractions is likely to account for these observed discrepancies. Recorded motility patterns are influenced by different recording techniques, and these differences are a source of variability in recorded patterns of colonie motor activity.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 34 (1989), S. 672-676 
    ISSN: 1573-2568
    Keywords: upper esophageal sphincter ; manometry ; cricopharyngeus ; stress ; globus sensation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Anxiety and abnormal upper esophageal sphincter function have been ascribed ill- defined roles in the etiology of globus sensation. In this study, we examined the psychological profile and effect of acute mental stress (dichotic listening task) on UES tone in seven patients reporting to the clinic with globus sensation and 13 healthy controls. Alterations in heart rate, blood pressure, frontalis EMG, and skin conductance confirmed the effectiveness of the stress test in patients and controls. During resting conditions, UES pressure (mean±SE) in patients (40.4±4.6 mm Hg) did not differ significantly from controls (46.5±4.7 mm Hg). In response to stress, UES pressure rose by 31% in patients (P=0.04) and by 25% in controls (P=0.002). The stress- induced rise in UES pressure in patients (9.5±3.8 mm Hg) was not significantly different to that observed in controls (11.8±3.0 mm Hg). Psychological profiles of globus patients presenting to the clinic revealed them to be more introverted, anxious, neurotic, and depressed than normal controls. We conclude that in patients with a history of globus sensation, resting UES pressure and its response to stress is normal. Although individuals presenting to the clinic with globus sensation showed increased levels of psychoneurosis, acute, predictable stress is not a factor in the genesis of globus sensation. UES hyperresponsiveness to other stimuli or subjective intolerance to changes in UES pressure could account for symptoms of globus sensation.
    Type of Medium: Electronic Resource
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