30). The obese group had lower EE (p < 0.05) during each time period and over the entire 22-hours (p < 0.05), in comparison to their lean counterparts. Conclusion The EMTAC proved to be a valuable tool for metabolic measurements in monkeys. The accuracy and sensitivity of the instrument allowed detection of subtle metabolic changes in relation to energy intake. Moreover, there is an association between a reduction of energy expenditure and a gain in body weight."/>
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Table 1 Anthropometrics and energy metabolism of the 16 monkeys in the study

From: Energy expenditure in chow-fed female non-human primates of various weights

Number of monkeys 16
Age (years) 11.7 ± 4.6
Body weight (kg) 5.5 ± 1.4
Modified BMI (kg/crown-rump length, m2) 28.8 ± 6.7
22-hour Energy intake (kcal/kg) 38.5 ± 31.6
22-hour energy expenditure (kcal/kg) 48.7 ± 8.9
Day period energy expenditure (kcal/kg) 20.1 ± 3.4
Dark period energy expenditure (kcal/kg) 23.7 ± 4.6
Morning energy expenditure (kcal/kg) 4.9 ± 1.1
22-hour respiratory quotient (VCO2/VO2) 0.83 ± 0.05
Day period respiratory quotient (VCO2/VO2) 0.82 ± 0.04
Dark period respiratory quotient (VCO2/VO2) 0.83 ± 0.07
Morning respiratory quotient (VCO2/VO2) 0.83 ± 0.07