scholarly journals Nocturnal torpor by superb fairy-wrens: a key mechanism for reducing winter daily energy expenditure

2019 ◽  
Vol 15 (6) ◽  
pp. 20190211 ◽  
Author(s):  
Alex B. Romano ◽  
Anthony Hunt ◽  
Justin A. Welbergen ◽  
Christopher Turbill
Keyword(s):  
Energy Expenditure ◽  
Resting Metabolic Rate ◽  
Resting Energy Expenditure ◽  
Active Phase ◽  
High Mass ◽  
Energy Budgets ◽  
Specific Rate ◽  
Free Living ◽  
Daily Energy ◽  
Malurus Cyaneus

Many passerine birds are small and require a high mass-specific rate of resting energy expenditure, especially in the cold. The energetics of thermoregulation is, therefore, an important aspect of their ecology, yet few studies have quantified thermoregulatory patterns in wild passerines. We used miniature telemetry to record the skin temperature ( T skin ) of free-living superb fairy-wrens ( Malurus cyaneus , 8.6 g; n = 6 birds over N = 7–22 days) and determine the importance of controlled reductions in body temperature during resting to their winter energy budgets. Fairy-wrens routinely exhibited large daily fluctuations in T skin between maxima of 41.9 ± 0.6°C and minima of 30.4 ± 0.7°C, with overall individual minima of 27.4 ± 1.1°C (maximum daily range: 14.7 ± 0.9°C). These results provide strong evidence of nocturnal torpor in this small passerine, which we calculated to provide a 42% reduction in resting metabolic rate at a T a of 5°C compared to active-phase T skin . A capacity for energy-saving torpor has important consequences for understanding the behaviour and life-history ecology of superb fairy-wrens. Moreover, our novel field data suggest that torpor could be more widespread and important than previously thought within passerines, the most diverse order of birds.

Validation of the BIOPAC indirect calorimeter for determining resting energy expenditure in healthy free-living older people

2009 ◽  
Vol 29 (8) ◽  
pp. 531-541 ◽  
Author(s):  
Kerstin Khalaj-Hedayati ◽  
Anja Bosy-Westphal ◽  
Manfred J. Müller ◽  
Manuela Dittmar
Keyword(s):  
Energy Expenditure ◽  
Older People ◽  
Resting Energy Expenditure ◽  
Free Living ◽  
Resting Energy

Components and variations in daily energy expenditure of athletic and non-athletic adolescents in free-living conditions

2000 ◽  
Vol 84 (4) ◽  
pp. 531-539 ◽  
Author(s):  
Jérôme Ribeyre ◽  
Nicole Fellmann ◽  
Jean Vernet ◽  
Michel Delaître ◽  
Alain Chamoux ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Direct Method ◽  
Exercise Duration ◽  
Living Conditions ◽  
Fat Free Mass ◽  
Whole Body ◽  
Daily Energy Expenditure ◽  
Free Living ◽  
Daily Energy ◽  
Free Living Conditions

The objectives of the study were to determine: (1) daily energy expenditure (EE) of athletic and non-athletic adolescents of both sexes in free-living conditions; (2) day-to-day variations in daily EE during 1 week; (3) energy costs of the main activities; and (4) the effect of usual activity on EE during sleep, seated and miscellaneous activities. Fifty adolescents (four groups of eleven to fifteen boys or girls aged 16–19 years) participated in the study. Body composition was measured by the skinfold-thickness method, and VO2max and external mechanical power (EMP) by a direct method (respiratory gas exchanges) on a cycloergometer. Daily EE and partial EE in free-living conditions were computed from heart-rate (HR) recordings during seven consecutive days using individual prediction equations established from the data obtained during a 24 h period spent in whole-body calorimeters with similar activities. Fat-free mass (FFM), VO2max, EMP, daily EE and EE during sleep were significantly higher in athletic than in non-athletic subjects. After adjustment for FFM, VO2max, EMP, daily EE and EE during exercise were still higher in athletic than in non-athletic adolescents (P<0·001). However, adjusted sleeping EE was not significantly different between athletic and non-athletic adolescents. Increases in exercise EE were partly compensated for by significant reductions in EE during schoolwork and miscellaneous activities. Thus, the differences in daily EE between athletic and non-athletic subjects resulted mainly from increases in FFM and EE during exercise (duration and energy cost).

scholarly journals Context-dependent correlation between resting metabolic rate and daily energy expenditure in wild chipmunks

2012 ◽  
Vol 216 (3) ◽  
pp. 418-426 ◽  
Author(s):  
V. Careau ◽  
D. Reale ◽  
D. Garant ◽  
F. Pelletier ◽  
J. R. Speakman ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Daily Energy Expenditure ◽  
Daily Energy ◽  
Context Dependent ◽  
Dependent Correlation

scholarly journals Indirect Calorimetry Protocol Development for Measuring Resting Metabolic Rate as a Component of Total Energy Expenditure in Free-Living Postmenopausal Women

2001 ◽  
Vol 131 (8) ◽  
pp. 2215-2218 ◽  
Author(s):  
Neilann K. Horner ◽  
Johanna W. Lampe ◽  
Ruth E. Patterson ◽  
Marian L. Neuhouser ◽  
Shirley A. Beresford ◽  
...  
Keyword(s):  
Energy Expenditure ◽  
Metabolic Rate ◽  
Total Energy ◽  
Postmenopausal Women ◽  
Indirect Calorimetry ◽  
Resting Metabolic Rate ◽  
Total Energy Expenditure ◽  
Free Living ◽  
Protocol Development

DHA supplementation decreases resting metabolic rate in healthy young females

2020 ◽  
Vol 45 (2) ◽  
pp. 221-225
Author(s):  
Sebastian Jannas-Vela ◽  
Shannon L. Klingel ◽  
David M. Mutch ◽  
Lawrence L. Spriet
Keyword(s):  
Sex Differences ◽  
Energy Expenditure ◽  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Resting Energy Expenditure ◽  
Substrate Oxidation ◽  
Acid Supplementation ◽  
Young Females ◽  
Independent Effects ◽  
Healthy Females

This study examined the independent effects of eicosapentaenoic (EPA) and docosahexaenoic (DHA) acid supplementation on resting metabolic rate (RMR) and substrate oxidation in young healthy females and males. EPA or DHA supplementation had no effect on RMR and substrate oxidation in males, while DHA reduced RMR by ∼7% (p < 0.01) in females. In conclusion, these data establish potential sex differences on RMR in response to DHA supplements. Novelty Supplementing with DHA decreases resting energy expenditure in healthy young females but not males.

scholarly journals Alcohol and its acute effects on resting metabolic rate and diet-induced thermogenesis

1990 ◽  
Vol 64 (2) ◽  
pp. 413-425 ◽  
Author(s):  
Jan A. Weststrate ◽  
Ingrid Wunnink ◽  
Paul Deurenberg ◽  
Joseph G. A. J. Hautvast
Keyword(s):  
Energy Expenditure ◽  
Metabolic Rate ◽  
Resting Metabolic Rate ◽  
Resting Energy Expenditure ◽  
Random Order ◽  
Systematic Difference ◽  
Control Treatment ◽  
Diet Induced Thermogenesis ◽  
The Impact ◽  
Thermic Effect

The impact of alcohol (ethanol) on resting energy expenditure of male non-obese volunteers was determined in two studies. In the first study the thermic effect of alcohol on resting metabolic rate (RMR) was assessed in ten male non-obese volunteers. In the second study the impact of alcohol on diet-induced thermogenesis (DIT) was determined in twelve male non-obese volunteers. Energy expenditure was measured with a ventilated-hood system. RMR was measured for 60 min with the subjects in a fasting state. In the first study subjects received in random order 20 g alcohol in concentrations of 75, 180 and 300 ml/I water respectively. After measurement of the RMR the thermic effect of alcohol was measured for 90 min. In the second study volunteers received in random order and in duplicate either a meal of food (2 MJ) plus an alcoholic aperitif (20 g alcohol in a 180 ml/1 solution) or an isoenergetic meal of food alone (2.55 MJ) plus a placebo aperitif containing no alcohol. DIT was measured for 240 min. Alcohol induced a significant thermic effect, which varied between 0.22 and 0.30 kJ/min. No systematic difference in DIT was observed among the different concentrations. DIT was not significantly affected by the ingestion of alcohol. Total DIT was 219 (SE 14) kJ for the alcohol treatment and 185 (SE 20) kJ for the control treatment. The results do not support the suggestion that alcohol is less efficiently used as an energy source in comparison with, for example, fats and carbohydrates.

Winter energy expenditure and the distribution of southern flying squirrels

1991 ◽  
Vol 69 (10) ◽  
pp. 2548-2555 ◽  
Author(s):  
Paul Stapp ◽  
Peter J. Pekins ◽  
William W. Mautz
Keyword(s):  
Energy Expenditure ◽  
Heat Loss ◽  
Current Distribution ◽  
Basal Metabolism ◽  
Energy Budgets ◽  
Late Winter ◽  
Daily Energy Expenditure ◽  
Flying Squirrels ◽  
Tree Cavities ◽  
Daily Energy

The southern flying squirrel (Glaucomys volans) forms large aggregations inside nest-lined tree cavities to reduce exposure to winter temperatures. We measured oxygen consumption of individuals and grouped flying squirrels in Plexiglas and nest-box chambers in New Hampshire to determine savings provided by huddling and nest construction. Because G. volans breeds during late winter, we also measured energy expenditure of females during gestation and lactation. These data were used to construct daily energy budgets for flying squirrels during winter and to investigate the relationship between this species' cold tolerance and its current distribution. Flying squirrels had lower basal metabolism (0.95 cm3 O2∙g−1∙h−1) and rate of heat loss (0.11 cm3 O2∙g−1∙h−1∙ °C−1) than predicted according to mass. Peak reproductive costs (1 week postparturition) were 170% of nonbreeding requirements. At 9 °C, huddling in groups of three and six reduced energy expenditure by 27 and 36%, respectively. Compared with individuals without nests, nest insulation decreased heat loss by 37% for single squirrels and reduced lower critical temperature from 26.5 to 12.2 °C for groups of six. As estimated from our budget, aggregating reduces winter daily energy expenditure by 26–33%. At the northern range boundary, daily expenditure for squirrels using both aggregations and nests (2.5 times basal metabolism) and for females during peak lactation (3.9 times basal metabolism) was similar to estimates of maximal daily energy expenditure in the literature. We speculate that additional thermoregulatory costs and the decreased abundance of hard mast for winter caches prevent G. volans from occupying areas north of its current distribution.

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