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Figure 5


Fig. 5. Energy budget of Workload mice during baseline and workload conditions. Panel A shows the absolute values and panel B the mass-specific values. To determine the energy balance we used measures of resting metabolic rate (RMR, light-grey bars) and daily energy expenditure (DEE). Energy for activity (ACT, darker grey bars) was calculated by deducting RMR from DEE. In addition, the gross energy intake (GEI) was calculated on the basis of the absolute food intake during the DLW measurements. Metabolisable energy intake (MEI, striped bars) was then calculated from GEI, assuming that digestive efficiency together with energy lost in the urine was 79.1% (Hambly and Speakman, 2005). The white bars represent the energetic value of the food that is not metabolized (GEI–MEI=Waste, W). The numbers in the bars represent the amount of energy (either in kJ d–1 or in kJ g–1 d–1) spent on each part of the energy budget. The bracket shows the surplus energy available to the animals for growth.





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