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We describe audible and ultrasonic vocalization elicited in rats by a short electrical pulse applied to the tail. Three types of vocal emissions were recorded: (1) 'peep', characterized by a repartition of energy over a wide range (0-50 kHz) of frequencies without any clear structure; (2) 'chatters', characterized by an audible (frequencies in hearing range(More)
We propose the LOU/c/jall rat as a possible model for research into aging. Physiological and behavioral data have been collected over the past 5 years, using lifelong and cross-sectional studies. The median life span of the rats was 29 months in males and 33-34 months in females. A low level of body fat throughout life was observed in both sexes. Basic(More)
Complex vocal responses in both the audible and ultrasonic frequency ranges were elicited by a single 2 ms electrical pulse applied to the tail. The first two cries exhibited consistent latencies and durations, were intensity-dependent and were triggered by peripheral fibres with conduction velocities of 7.3 +/- 0.8 and 0.7 +/- 0.1 ms-1, respectively. These(More)
BACKGROUND Experimental data on nociception in the elderly have so far been contradictory and most of these have been obtained using psychophysical methods with little attention paid simultaneously to the state of cognition and the psychometric performance of the subjects. OBJECTIVE The aim of this study was twofold: (1) to evaluate the impact of age on(More)
Brief electrical pulses applied to the rat tail elicit a complex vocal response which includes audible (peeps, chatters) and ultrasonic (USV) components. Aspirin and amitriptyline had no effect on the vocal responses. Morphine showed a dose-dependent and naloxone reversible antinociceptive effect on the 1st and 2nd audible peeps by decreasing their(More)
Previous studies have shown a shift of preferences from carbohydrate to fat and a decrease in protein intake in self-selected Lou/c rats with advancing age. This study investigated a potential neurochemical mechanism underlying age-related modifications by evaluating the effects of fenfluramine (dl-F), a drug that enhances 5-HT release and blocks its(More)
The relationship between pain and sleep seems to be reciprocal: if pain may interrupt or disturb sleep, poor sleep can also influence pain perception. However the influence of sleep disturbances on pain sensitivity remain poorly investigated. The aim of this study was to assess the effect of REM sleep deprivation on the reaction of rats subjected to(More)
BACKGROUND Schools are key settings for health promotion (HP) but the development of suitable approaches for evaluating HP in schools is still a major topic of discussion. This article presents a research protocol of a program developed to evaluate HP. After reviewing HP evaluation issues, the various possible approaches are analyzed and the importance of a(More)
The aim of this study was to develop a new behavioral pain test based on the evaluation of cognitive capacity impairments in rats with colitis and to determine the impact of different acute analgesic treatments. Colitis was induced in rats by an enema containing 2,4,6-trinitrobenzen sulfonic acid. Visual non-selective, non-sustained attentional level was(More)