Two apparatus for detection of motility and water consumption of rodents☆

Weyers, Marc-Henri; Annys, M.

doi:10.1016/0031-9384(82)90253-0

Cited by 7 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Light and temperature cycles were similar to those used in the CTR group. Motor and drinking activities were recorded continuously until the 38th day (technical details in Weyers and Annys, 1982). Fifteen-minute intervals were used in data analysis.…”

Section: Methodsmentioning

confidence: 99%

Neonatal Exposure to Atypical Zeitgeber in the Wistar Rat. Effects on Development of Circadian Rhythms of Drinking and Motor Activities

Schelstraete¹,

Dutilleul²,

Weyers³

1997

Biological Rhythm Research

View full text Add to dashboard Cite

The data described concern the maturation of circadian motor and drinking rhythms immediately after weaning. We ran two experiments in both of which mother rats and their litters were subjected to either an atypical Zeitgeber or to standard conditions from the birth of the young up to weaning on the 19th day. In the experimental groups, the light and the temperature cycles were permanently in phase opposition and were shifted by 12 hours every 3 days. In the control groups, the cycles were the same except that they were in phase and were never shifted. In the first experiment, after weaning the young were subjected to an LD cycle; in the second experiment to constant conditions. The results of both experiments showed that the circadian rhythms of drinking and locomotor activities appeared with a delay of ten days in the experimental rats. These rats kept an ultradian structure for a longer time. During the constant conditions, a lengthening (around 25 min.) of the free-running period was observed. In conclusion, atypical environmental cycles during early neonatal life affect the development of the circadian system.

show abstract

Section: Methodsmentioning

confidence: 99%

Neonatal Exposure to Atypical Zeitgeber in the Wistar Rat. Effects on Development of Circadian Rhythms of Drinking and Motor Activities

Schelstraete¹,

Dutilleul²,

Weyers³

1997

Biological Rhythm Research

View full text Add to dashboard Cite

show abstract

“…The measurement of activity has been proposed in a variety of ways, some of which are incredibly creative: running wheel (6)(7)(8), tuned oscillator circuits (9), optical systems (10,11) using photocells, impedance variation detector circuits (12), systems based on inertial forces (13), Doppler effect, piezoelectric effect and electrophysiological signals (14)(15)(16), stabilimeters (a cage so supported that it is displaced slightly from resting position by subject's movements) (17), ultrasonic signals (18), and mechanical and electrical contacts in plates (19,20), among others (21).…”

Section: Introductionmentioning

confidence: 99%

Low-cost automatic activity data recording system

Moraes

Ferrarezi

Mont’alverne

et al. 1997

Braz J Med Biol Res

View full text Add to dashboard Cite

We describe a low-cost, high quality device capable of monitoring indirect activity by detecting touch-release events on a conducting surface, i.e., the animal's cage cover. In addition to the detecting sensor itself, the system includes an IBM PC interface for prompt data storage. The hardware/software design, while serving for other purposes, is used to record the circadian activity rhythm pattern of rats with time in an automated computerized fashion using minimal cost computer equipment (IBM PC XT). Once the sensor detects a touchrelease action of the rat in the upper portion of the cage, the interface sends a command to the PC which records the time (hours-minutesseconds) when the activity occurred. As a result, the computer builds up several files (one per detector/sensor) containing a time list of all recorded events. Data can be visualized in terms of actograms, indicating the number of detections per hour, and analyzed by mathematical tools such as Fast Fourier Transform (FFT) or cosinor. In order to demonstrate method validation, an experiment was conducted on 8 Wistar rats under 12/12-h light/dark cycle conditions (lights on at 7:00 a.m.). Results show a biological validation of the method since it detected the presence of circadian activity rhythm patterns in the behavior of the rats.

show abstract