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Nutr Cancer. 2019 Jul 8:1-8. doi: 10.1080/01635581.2019.1635172. [Epub ahead of print]

Profiling Determinants of Resting Energy Expenditure in Colorectal Cancer.

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a Department of Agricultural, Food, and Nutritional Science, Faculty of Agricultural, Life, and Environmental Sciences , University of Alberta , Edmonton , Canada.
b Department of Oncology, Faculty of Medicine and Dentistry , University of Alberta , Edmonton , Canada.
c Department of Kinesiology, Applied Health Sciences , University of Waterloo , Waterloo , Canada.
d College of Pharmacy and Nutrition , University of Saskatchewan , Saskatoon , Canada.


Background: Understanding resting energy expenditure (REE) is important for determining energy requirements; REE might be altered in individuals with cancer. The objective of this study was to characterize determinants of REE in patients with stages II-IV colorectal cancer (CRC). Methods: REE was measured via indirect calorimetry in patients with newly diagnosed CRC. Computerized tomography images from medical records ascertained skeletal muscle and total adipose tissue cross-sectional areas, which were then transformed to lean soft tissue (LST) and fat mass (FM) values (in kg). Linear regression assessed determinants of REE. Results: 86 patients were included (n = 55, 64.0% male; 60 ± 12 years old; median body mass index: 27.6, interquartile range: 24.3-31.2 kg/m2), with most (n = 40) having stage III disease. Age, sex, and weight were significant predictors of REE [R2 = 0.829, standard error of the estimate (SEE): 128 kcal/day, P < 0.001]. Replacing weight with LST and FM yielded a similar model, with age, sex, LST, and FM predictive of REE (R2 = 0.820, SEE: 129 kcal/day, p < 0.001). Conclusion: Age, sex, weight, LST, and FM were the main contributors to REE. Further investigation of REE changes over time and its relationship to total energy expenditure, dietary intake, and clinical outcomes should be explored.

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