Free-ranging heart rate, body temperature and energy metabolism in eastern grey kangaroos ( Macropus giganteus ) and red kangaroos ( Macropus rufus ) in the arid regions of South East Australia

2001 ◽  
Vol 171 (5) ◽  
pp. 401-411 ◽  
Author(s):  
McCarron H. ◽  
Buffenstein R. ◽  
Fanning F. ◽  
Dawson T.
Keyword(s):  
Heart Rate ◽  
Energy Metabolism ◽  
Body Temperature ◽  
Arid Regions ◽  
Macropus Rufus ◽  
The Arid Regions ◽  
Free Ranging

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

Effect of body temperature on energy metabolism and heart rate of dogs after CNS destruction

1966 ◽  
Vol 210 (6) ◽  
pp. 1260-1264 ◽  
Author(s):  
PE Galvao ◽  
AC Paiva ◽  
CA De Magalhaes ◽  
EA Limaos
Keyword(s):  
Heart Rate ◽  
Energy Metabolism ◽  
Body Temperature

A songbird adjusts its heart rate and body temperature in response to season and fluctuating daily conditions

2021 ◽  
Vol 376 (1830) ◽  
pp. 20200213 ◽  
Author(s):  
Nils Linek ◽  
Tamara Volkmer ◽  
J. Ryan Shipley ◽  
Cornelia W. Twining ◽  
Daniel Zúñiga ◽  
...  
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Environmental Conditions ◽  
Field Studies ◽  
Weather Extremes ◽  
Ambient Temperatures ◽  
In The Wild ◽  
Radio Transmitters ◽  
Save Energy ◽  
Free Ranging

In a seasonal world, organisms are continuously adjusting physiological processes relative to local environmental conditions. Owing to their limited heat and fat storage capacities, small animals, such as songbirds, must rapidly modulate their metabolism in response to weather extremes and changing seasons to ensure survival. As a consequence of previous technical limitations, most of our existing knowledge about how animals respond to changing environmental conditions comes from laboratory studies or field studies over short temporal scales. Here, we expanded beyond previous studies by outfitting 71 free-ranging Eurasian blackbirds ( Turdus merula ) with novel heart rate and body temperature loggers coupled with radio transmitters, and followed individuals in the wild from autumn to spring. Across seasons, blackbirds thermoconformed at night, i.e. their body temperature decreased with decreasing ambient temperature, but not so during daytime. By contrast, during all seasons blackbirds increased their heart rate when ambient temperatures became colder. However, the temperature setpoint at which heart rate was increased differed between seasons and between day and night. In our study, blackbirds showed an overall seasonal reduction in mean heart rate of 108 beats min −1 (21%) as well as a 1.2°C decrease in nighttime body temperature. Episodes of hypometabolism during cold periods likely allow the birds to save energy and, thus, help offset the increased energetic costs during the winter when also confronted with lower resource availability. Our data highlight that, similar to larger non-hibernating mammals and birds, small passerine birds such as Eurasian blackbirds not only adjust their heart rate and body temperature on daily timescales, but also exhibit pronounced seasonal changes in both that are modulated by local environmental conditions such as temperature. This article is part of the theme issue ‘Measuring physiology in free-living animals (Part I)’.

Autonomic control of heart rate exhibits diurnal shifts in a crocodilian

2008 ◽  
Vol 29 (4) ◽  
pp. 567-571 ◽  
Author(s):  
Mariana Micheli ◽  
Hamish Campbell
Keyword(s):  
Heart Rate ◽  
Cardiac Output ◽  
Body Temperature ◽  
Diurnal Cycle ◽  
Natural Habitat ◽  
Dorsal Surface ◽  
Heart Beat ◽  
Rate Of Change ◽  
Fine Tuning ◽  
Free Ranging

AbstractOver the diurnal cycle most reptiles show large changes in internal body temperature and heart rate (fH). The raising of fH, as the surface of a heliothermic reptile warms, increases cardiac output and facilitates in optimising the preferred daily body temperature (PDBT). In mammals, the fine tuning of cardiac output by the autonomic system can be observed through distinct oscillatory patterns in fH. This study examined Caiman latirostris (n = 6) to determine if similar oscillations in fH were present, and to assess if they exhibited a diurnal component associated with daily shifts in body temperature. A surgically implanted miniature datalogger recorded every heart beat and the dorsal surface temperature (Tds) of animals free-ranging in a semi-natural habitat. All C. latirostris exhibited rapid warming of Tds between 0700 and 1200. This was correlated with a rapid increase in fH, accompanied by erratic beat-to-beat oscillations in instantaneous fH. As Tds cooled, fH decreased and the short-term oscillations were abolished, resulting in a much slower rate of change in instantaneous fH. The two distinct fH rhythms may serve to optimise the PDBT over the diurnal cycle.

scholarly journals Estimation of cardiovascular drift through ear temperature during prolonged steady-state cycling: a study protocol

2021 ◽  
Vol 7 (1) ◽  
pp. e000907
Author(s):  
Giovanni Polsinelli ◽  
Angelo Rodio ◽  
Bruno Federico
Keyword(s):  
Heart Rate ◽  
Steady State ◽  
Body Temperature ◽  
Study Protocol ◽  
External Auditory Canal ◽  
Exercise Intensity ◽  
Core Body Temperature ◽  
Cardiovascular Drift ◽  
Core Body ◽  
Steady State Cycling

IntroductionThe measurement of heart rate is commonly used to estimate exercise intensity. However, during endurance performance, the relationship between heart rate and oxygen consumption may be compromised by cardiovascular drift. This physiological phenomenon mainly consists of a time-dependent increase in heart rate and decrease in systolic volume and may lead to overestimate absolute exercise intensity in prediction models based on heart rate. Previous research has established that cardiovascular drift is correlated to the increase in core body temperature during prolonged exercise. Therefore, monitoring body temperature during exercise may allow to quantify the increase in heart rate attributable to cardiovascular drift and to improve the estimate of absolute exercise intensity. Monitoring core body temperature during exercise may be invasive or inappropriate, but the external auditory canal is an easily accessible alternative site for temperature measurement.Methods and analysisThis study aims to assess the degree of correlation between trends in heart rate and in ear temperature during 120 min of steady-state cycling with intensity of 59% of heart rate reserve in a thermally neutral indoor environment. Ear temperature will be monitored both at the external auditory canal level with a contact probe and at the tympanic level with a professional infrared thermometer.Ethics and disseminationThe study protocol was approved by an independent ethics committee. The results will be submitted for publication in academic journals and disseminated to stakeholders through summary documents and information meetings.

scholarly journals The influence of weather conditions on body temperature, milk composition and yields of the free-ranging dromedary camels in Southeastern rangelands of Ethiopia

2021 ◽  
Vol 7 (1) ◽  
pp. 1930932
Author(s):  
Matiwos Habte ◽  
Mitiku Eshetu ◽  
Melesse Maryo ◽  
Dereje Andualem ◽  
Abiyot Legesse ◽  
...  
Keyword(s):  
Body Temperature ◽  
Weather Conditions ◽  
Milk Composition ◽  
Dromedary Camels ◽  
Free Ranging

Ambient temperature effects on physiological traits of white-tailed deer

1975 ◽  
Vol 53 (6) ◽  
pp. 679-685 ◽  
Author(s):  
J. B. Holter ◽  
W. E. Urban Jr. ◽  
H. H. Hayes ◽  
H. Silver ◽  
H. R. Skutt
Keyword(s):  
Heart Rate ◽  
Body Temperature ◽  
Energy Expenditure ◽  
Ambient Temperature ◽  
Temperature Effects ◽  
Temperature Changes ◽  
Wind Chill ◽  
Ambient Temperatures ◽  
Energy Equilibrium ◽  
Body Energy

Six adult white-tailed deer (Odocoileus virginianus borealis) were exposed to 165 periods of 12 consecutive hours of controlled constant ambient temperature in an indirect respiration calorimeter. Temperatures among periods varied from 38 to 0 (summer) or to −20C (fall, winter, spring). Traits measured were energy expenditure (metabolic rate), proportion of time spent standing, heart rate, and body temperature, the latter two using telemetry. The deer used body posture extensively as a means of maintaining body energy equilibrium. Energy expenditure was increased at low ambient temperature to combat cold and to maintain relatively constant body temperature. Changes in heart rate paralleled changes in energy expenditure. In a limited number of comparisons, slight wind chill was combatted through behavioral means with no effect on energy expenditure. The reaction of deer to varying ambient temperatures was not the same in all seasons of the year.

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