Reversible, within-individual variation (flexibility) in phenotypic traits may be influenced by natural selection, and may confer costs and benefits on the individual. Specifically, flexibility in avian basal metabolic rate (BMR) seems to be linked to flexibility in the masses of certain organs and in the metabolic intensities of certain tissues, and depends primarily on body mass, but also on ...

Since the 5 century BC consideration has been given to diet and training for improved physical performance. In contrast the impact of environmental temperature and humidity on performance has largely been ignored until recent times, despite the fact that the environmental threat can result in severe impairment of performance and even death. As physical performance is impaired in both hot and co...

Intraspecific variation in avian thermoregulatory responses to heat stress has received little attention, despite increasing evidence that endothermic animals show considerable physiological variation among populations. We investigated seasonal (summer versus winter) variation in heat tolerance and evaporative cooling in an Afrotropical ploceid passerine, the white-browed sparrow-weaver (Plocep...

Abstract Introduction Auto-titrating positive airway pressure (APAP) with remote monitoring provides valuable information on requirements during acclimatisation to APAP in children. However there are no reliable predictors of children help guide clinician prescribing upon commencement APAP. Methods Retrospective review commencing outpatient tertiary hospital from 2017-2022. Initial prescription...

Summit metabolism (M sum), the maximum rate of resting metabolic thermogenesis, has been found to be broadly correlated with climatic variables and the use of heterothermy in some endotherms. Far less is known about M sum and metabolic expansibility [ME, the ratio of M sum to basal metabolic rate (BMR)] in bats compared with many other endotherm taxa. We measured BMR and M sum during winter and...

Although practices that employ native species in plantation systems are common, the study of Neolamarckia cadamba Roxb. Bosser (White Laran) and Octomeles sumatrana Miq. (Binuang) below-ground parameters is limited. The present was conducted to compare initial growth performance between these two trees under water-logged water-stress conditions. near greenhouse Faculty Tropical Forestry (Univer...

Red-footed Tortoises (Chelonoidis carbonaria Spix, 1824) raised as pets and voluntarily handed over to environmental officers by their owners or apprehended by officers represent a large contingent of animals that overfill triage centres in Brazil. There is no consensus on the fate of these animals, and their numbers continue growing. In this study, we evaluated the movement patterns of C. carb...

The study of healthy human volunteers ascending to high altitude provides a robust model of the complex physiological interplay that emulates human adaptation to hypoxaemia in clinical conditions. Nitric oxide (NO) metabolism may play an important role in both adaptation to high altitude and response to hypoxaemia during critical illness at sea level. Circulating nitrate and nitrite concentrati...

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Erythropoietin (EPO) and soluble EPO receptors (sEPOR) have been proposed to play a central role in the ventilatory acclimatisation to continuous hypoxia in mice. In this study, we demonstrated for the first time in humans (n = 9) that sEPOR is downregulated upon daytime exposure to 4 days of intermittent hypoxia (IH; 6 h·day⁻¹, cycles of 2 min of hypoxia followed by 2 min of reoxygenation; pea...