Estimating resting metabolic rate by biologging core and subcutaneous temperature in a mammal

Rey, Benjamin; Halsey, Lewis G.; Hetem, Robyn S.; Fuller, Andrea; Mitchell, Duncan; Rouanet, Jean‐Louis

doi:10.1016/j.cbpa.2015.01.012

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…Among endotherms it has been widely accepted that body temperature is directly influenced by metabolic rate, as this is the principal origin of endogenous heat [32,33]. In this respect, our calorimetric results are in line with body temperature observations.…”

Section: Discussionsupporting

confidence: 90%

Physiological and cognitive consequences of a daily 26 h photoperiod in a primate:exploring the underlying mechanisms of the circadian resonance theory

Hozer

Pifferi

2020

Proc. R. Soc. B.

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The biological clock expresses circadian rhythms, whose endogenous period (tau) is close to 24 h. Daily resetting of the circadian clock to the 24 h natural photoperiod might induce marginal costs that would accumulate over time and forward affect fitness. It was proposed as the circadian resonance theory. For the first time, we aimed to evaluate these physiological and cognitive costs that would partially explain the mechanisms of the circadian resonance hypothesis. We evaluated the potential costs of imposing a 26 h photoperiodic regimen compared to the classical 24 h entrainment measuring several physiological and cognitive parameters (body temperature, energetic expenditure, oxidative stress, cognitive performances) in males of a non-human primate ( Microcebus murinus ), a nocturnal species whose endogenous period is about 23.5 h. We found significant higher resting body temperature and energy expenditure and lower cognitive performances when the photoperiodic cycle length was 26 h. Together these results suggest that a great deviation of external cycles from tau leads to daily greater energetic expenditure, and lower cognitive capacities. To our knowledge, this study is the first to highlight potential mechanisms of circadian resonance theory.

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Section: Discussionsupporting

confidence: 90%

Physiological and cognitive consequences of a daily 26 h photoperiod in a primate:exploring the underlying mechanisms of the circadian resonance theory

Hozer

Pifferi

2020

Proc. R. Soc. B.

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“…Among endotherms it has been widely accepted that body temperature is directly influenced by metabolic rate, as this is the principal origin of endogenous heat (Berger et al, 1988; Clarke et al, 2010; Gillooly et al, 2001; Lovegrove, 2003; Rey et al, 2015; Rezende and Bacigalupe, 2015; Rising et al, 1992). In this respect, our calorimetric results are in line with body temperature observations.…”

Section: Discussionmentioning

confidence: 99%

Physiological and cognitive consequences of a daily 26h photoperiod in a primate(M. murinus)

Hozer

Pifferi

2020

Preprint

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Daily resetting of the circadian clock to the 24h natural photoperiod might induce marginal costs that would accumulate over time and forward affect fitness. It was proposed as the circadian resonance theory by Pittendrigh in 1972. For the first time, we aimed to evaluate these physiological and cognitive costs that would partially explain the mechanisms of the circadian resonance hypothesis. We evaluated the potential costs of imposing a 26h photoperiodic regimen compared to the classical 24h entrainment measuring several physiological and cognitive parameters (body temperature, energetic expenditure, oxidative stress, cognitive performances). We found significant higher resting body temperature and energy expenditure and lower cognitive performances when the photoperiodic cycle length was 26h. Together these results suggest that a great deviation of external cycles from 24h leads to daily greater synchronization costs, and lower cognitive capacities. To our knowledge, this study is the first to highlight potential mechanisms of circadian resonance theory.

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“…Mechanistic details of the animal-ambient heat exchange process are well-known from an experimental standpoint (Hill et al, 2012(Hill et al, , 2013Randall & Burggren, 2001;Rey et al, 2015). However, the theoretical model commonly used for the thermoregulation process relies heavily on arguments derived from Fourier's law of heat flow (Hill et al, 2013;Randall & Burggren, 2001), which only explains the shape of the metabolic-temperature curve for ambient temperatures below T UC .…”

Section: The Classical Model Revisitedmentioning

confidence: 99%

A Mathematical Model for Thermoregulation in Endotherms Including Heat Transport by Blood Flow and Thermal Feedback Control Mechanisms: Changes in Coat, Metabolic Rate, Blood Fluxes, Ventilation and Sweating Rates

Boldrinia

Viana

Reis

et al. 2018

LiB

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Thermoregulation in endotherms allows the maintenance of the body temperature independent of ambient temperature. Experimental data have revealed complex interactions between the physiological mechanisms of thermoregulation and environmental conditions. We derive a nonlinear partial integro-differential dynamical model based on physical first principles and fundamental physiological mechanisms to understand the role of some thermal control mechanisms in the thermoregulation process of endotherms. The model is composed of four layers representing different tissues and it incorporates six thermal feedback control mechanisms. These mechanisms are heat production due to metabolic rate and heat exchange within the body given its internal structure, and the model considers heat exchange due to conduction, heat transport by blood flow, heat exchange with the ambient through convection, radiation, and evaporation from the respiratory tract and superficial evaporation in both passive and active situations. Our model sheds new light on previous explanations about the classic metabolism-ambient temperature Ushaped curve.

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Estimating resting metabolic rate by biologging core and subcutaneous temperature in a mammal

Cited by 16 publications

References 31 publications

Physiological and cognitive consequences of a daily 26 h photoperiod in a primate:exploring the underlying mechanisms of the circadian resonance theory

Physiological and cognitive consequences of a daily 26 h photoperiod in a primate:exploring the underlying mechanisms of the circadian resonance theory

Physiological and cognitive consequences of a daily 26h photoperiod in a primate(M. murinus)

A Mathematical Model for Thermoregulation in Endotherms Including Heat Transport by Blood Flow and Thermal Feedback Control Mechanisms: Changes in Coat, Metabolic Rate, Blood Fluxes, Ventilation and Sweating Rates

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