ArticleDaily cycles in body temperature, metabolic rate, and substrate utilization in pigeons: influence of amount and timing of food consumption
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Regulation of body temperature
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2015, Journal of Thermal BiologyCitation Excerpt :Although physical activity is a passive influence, circadian core temperature change is thought to be regulated (Aschoff, 1983; Gander et al., 1986; Nagashima et al., 2005; Tokizawa et al., 2009). Fasting decreases core temperature in rats, mice and pigeons (Graf et al., 1989; Nagashima et al., 2003; Rashotte et al., 1995; Sakurada et al., 2000; Székely et al., 1997; Tokizawa et al., 2009; Yoda et al., 2000). Nagashima et al. (2003) showed that the reduction of core temperature occurs during the light phase of rats.
Stress-induced core temperature changes in pigeons (Columba livia)
2015, Physiology and BehaviorCitation Excerpt :The present data indicated that the transference of pigeons to a cage different from their “home cage” (the ExC with a consequent visual but not auditory separation from conspecifics) evokes a biphasic thermal response consisting of short-lived hyperthermia followed by a deep and long-lasting reduction in celomatic temperature. Nearly 2 h later, Tc returns to levels that are consistent with former reports of telemetrically recorded Tc in free-feeding pigeons during diurnal and nocturnal periods (e.g., [22,26–30]). The changes in Tc observed here appear to be unrelated to changes in room temperature or humidity, which were virtually the same as in their home cages.
Interleukin-18 null mutation increases weight and food intake and reduces energy expenditure and lipid substrate utilization in high-fat diet fed mice
2014, Brain, Behavior, and ImmunityCitation Excerpt :Third, the amplitude of the circadian rhythm of energy expenditure was blunted in IL-18 KO mice, and the amplitude of this rhythm reflects non-maintenance metabolic processes (Berger and Phillips, 1988). An increased frequency or quantity of energy intake, as was observed here, has been associated with a blunted amplitude of energy expenditure rhythms (Rashotte et al., 1995). Thus, the present study revealed that IL-18 KO mice differ not only in basal metabolic rate, but also in phasic aspects of energy metabolism.