scholarly journals Thermographic imaging of mouse across circadian time reveals body surface temperature elevation associated with non-locomotor body movements

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0252447
Author(s):  
Hiroyuki Shimatani ◽  
Yuichi Inoue ◽  
Yota Maekawa ◽  
Takahito Miyake ◽  
Yoshiaki Yamaguchi ◽  
...  
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Video Camera ◽  
Video Imaging ◽  
Circadian Time ◽  
Infrared Video ◽  
Locomotor Activities ◽  
Body Surface Temperature ◽  
Temporal Profiles ◽  
Thermal Video

Circadian clocks orchestrate multiple different physiological rhythms in a well-synchronized manner. However, how these separate rhythms are interconnected is not exactly understood. Here, we developed a method that allows for the real-time simultaneous measurement of locomotor activity and body temperature of mice using infrared video camera imaging. As expected from the literature, temporal profiles of body temperature and locomotor activity were positively correlated with each other. Basically, body temperatures were high when animals were in locomotion. However, interestingly, increases in body temperature were not always associated with the appearance of locomotor activity. Video imaging revealed that mice exhibit non-locomotor activities such as grooming and postural adjustments, which alone induce considerable elevation of body temperature. Noticeably, non-locomotor movements always preceded the initiation of locomotor activity. Nevertheless, non-locomotor movements were not always accompanied by locomotor movements, suggesting that non-locomotor movements provide a mechanism of thermoregulation independent of locomotor activity. In addition, in the current study, we also report the development of a machine learning-based recording method for the detection of circadian feeding and drinking behaviors of mice. Our data illustrate the potential utility of thermal video imaging in the investigation of different physiological rhythms.

Characterization of plasma sprayed coatings using thermal wave infrared video imaging

1987 ◽  
Vol 6 (4) ◽  
pp. 169-175 ◽  
Author(s):  
T. Ahmed ◽  
Z. J. Feng ◽  
P. K. Kuo ◽  
J. Hartikainen ◽  
J. Jaarinen
Keyword(s):  
Thermal Wave ◽  
Video Imaging ◽  
Infrared Video ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

Light-induced suppression of the rat circadian system

1995 ◽  
Vol 268 (5) ◽  
pp. R1111-R1116 ◽  
Author(s):  
P. Depres-Brummer ◽  
F. Levi ◽  
G. Metzger ◽  
Y. Touitou
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Circadian Rhythms ◽  
Prolonged Exposure ◽  
Light Exposure ◽  
Continuous Light ◽  
Circadian System ◽  
Short Exposure ◽  
Complete Suppression ◽  
Continuous Darkness

In a constant environment, circadian rhythms persist with slightly altered period lengths. Results of studies with continuous light exposure are less clear, because of short exposure durations and single-variable monitoring. This study sought to characterize properties of the oscillator(s) controlling the rat's circadian system by monitoring both body temperature and locomotor activity. We observed that prolonged exposure of male Sprague-Dawley rats to continuous light (LL) systematically induced complete suppression of body temperature and locomotor activity circadian rhythms and their replacement by ultradian rhythms. This was preceded by a transient loss of coupling between both functions. Continuous darkness (DD) restored circadian synchronization of temperature and activity circadian rhythms within 1 wk. The absence of circadian rhythms in LL coincided with a mean sixfold decrease in plasma melatonin and a marked dampening but no abolition of its circadian rhythmicity. Restoration of temperature and activity circadian rhythms in DD was associated with normalization of melatonin rhythm. These results demonstrated a transient internal desynchronization of two simultaneously monitored functions in the rat and suggested the existence of two or more circadian oscillators. Such a hypothesis was further strengthened by the observation of a circadian rhythm in melatonin, despite complete suppression of body temperature and locomotor activity rhythms. This rat model should be useful for investigating the physiology of the circadian timing system as well as to identify agents and schedules having specific pharmacological actions on this system.

scholarly journals A versatile telemetry system for continuous measurement of heart rate, body temperature and locomotor activity in free-ranging ruminants

2010 ◽  
Vol 1 (1) ◽  
pp. 75-85 ◽  
Author(s):  
Claudio Signer ◽  
Thomas Ruf ◽  
Franz Schober ◽  
Gerhard Fluch ◽  
Thomas Paumann ◽  
...  
Keyword(s):  
Heart Rate ◽  
Locomotor Activity ◽  
Body Temperature ◽  
Continuous Measurement ◽  
Telemetry System ◽  
Free Ranging

scholarly journals Effects of Resveratrol on Daily Rhythms of Locomotor Activity and Body Temperature in Young and Aged Grey Mouse Lemurs

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Fabien Pifferi ◽  
Alexandre Dal-Pan ◽  
Solène Languille ◽  
Fabienne Aujard
Keyword(s):  
Locomotor Activity ◽  
Body Temperature ◽  
Biological Clock ◽  
The Elderly ◽  
Aged Mouse ◽  
Dark Cycle ◽  
Temperature Rhythm ◽  
Mouse Lemurs ◽  
Body Temperature Rhythm ◽  
Activity Onset

In several species, resveratrol, a polyphenolic compound, activates sirtuin proteins implicated in the regulation of energy balance and biological clock processes. To demonstrate the effect of resveratrol on clock function in an aged primate, young and aged mouse lemurs(Microcebus murinus)were studied over a 4-week dietary supplementation with resveratrol. Spontaneous locomotor activity and daily variations in body temperature were continuously recorded. Reduction in locomotor activity onset and changes in body temperature rhythm in resveratrol-supplemented aged animals suggest an improved synchronisation on the light-dark cycle. Resveratrol could be a good candidate to restore the circadian rhythms in the elderly.

scholarly journals Assessment of body surface temperature in cetaceans: an iterative approach

2004 ◽  
Vol 64 (3b) ◽  
pp. 719-724 ◽  
Author(s):  
R. G. Silva
Keyword(s):  
Heat Transfer ◽  
Body Temperature ◽  
Surface Temperature ◽  
Marine Mammals ◽  
Skin Surface ◽  
Iterative Approach ◽  
Ambient Water ◽  
Deep Body Temperature ◽  
Body Surface Temperature ◽  
Deep Body

Heat transfer from skin surface to ambient water is probably the most important aspect of thermal balance in marine mammals, but the respective calculations depend on knowing the surface temperature (T S), the direct measurement of which in free animals is very difficult. An indirect iterative method is proposed for T S prediction in free cetaceans from deep body temperature, swimming speed, and temperature and thermodynamic properties of the water.

scholarly journals CIRCADA: Shiny Apps for Exploration of Experimental and Synthetic Circadian Time Series with an Educational Emphasis

2020 ◽  
Vol 35 (2) ◽  
pp. 214-222
Author(s):  
Lisa Cenek ◽  
Liubou Klindziuk ◽  
Cindy Lopez ◽  
Eleanor McCartney ◽  
Blanca Martin Burgos ◽  
...  
Keyword(s):  
Time Series ◽  
Data Analysis ◽  
Locomotor Activity ◽  
Body Temperature ◽  
Sampling Rate ◽  
Discrete Wavelet ◽  
Data Set ◽  
Maximum Entropy Spectral Analysis ◽  
Noise Characteristics ◽  
Synthetic Time Series

Circadian rhythms are daily oscillations in physiology and behavior that can be assessed by recording body temperature, locomotor activity, or bioluminescent reporters, among other measures. These different types of data can vary greatly in waveform, noise characteristics, typical sampling rate, and length of recording. We developed 2 Shiny apps for exploration of these data, enabling visualization and analysis of circadian parameters such as period and phase. Methods include the discrete wavelet transform, sine fitting, the Lomb-Scargle periodogram, autocorrelation, and maximum entropy spectral analysis, giving a sense of how well each method works on each type of data. The apps also provide educational overviews and guidance for these methods, supporting the training of those new to this type of analysis. CIRCADA-E (Circadian App for Data Analysis–Experimental Time Series) allows users to explore a large curated experimental data set with mouse body temperature, locomotor activity, and PER2::LUC rhythms recorded from multiple tissues. CIRCADA-S (Circadian App for Data Analysis–Synthetic Time Series) generates and analyzes time series with user-specified parameters, thereby demonstrating how the accuracy of period and phase estimation depends on the type and level of noise, sampling rate, length of recording, and method. We demonstrate the potential uses of the apps through 2 in silico case studies.

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