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Metabolism in Patients with Rheumatoid Arthritis: Resting Energy Expenditure, Physical Activity and Diet-Induced Thermogenesis. Invited Review.Metabolism is one of the most important physiological functions. Resting energy expenditure, physical activity and diet are the main factors of total metabolism but the contribution of these components to total energy expenditure may be significantly changed with chronic inflammatory diseases such as rheumatoid arthritis (RA). RA is a disease that alters normal metabolism due to the overproduction of pro-inflammatory cytokines and may lead to rheumatoid cachexia. This review focuses on the individual components of total energy expenditure and discusses how physical activity and diet may influence resting metabolism both in the healthy population as well as patients with RA. Moreover, information is provided regarding the available patents (i.e. equipment and prediction equations) that may be used in order to predict metabolism in the normal population and RA patients.
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Resting metabolic rate in obese and nonobese Chinese Singaporean boys aged 13–15 y1–3Background: Previous studies investigating the hypothesis that a low resting metabolic rate (RMR) is a cause of obesity yielded discrepant findings. Two explanations for these findings are the use of imprecise methods to determine obesity and a failure to control for differences in fat mass (FM) and fat-free mass (FFM) when comparing RMR values. Objective: This study tested the hypothesis that RMR is lower in obese than in nonobese boys (with the use of precise methods to quantify body fatness and with adjustment for differences in both FM and FFM). Design: Forty Chinese Singaporean boys aged 12.8–15.1 y were recruited. Boys were classified as obese (n = 20) or nonobese (n = 20) on the basis of their adiposity index (ratio of FM to FFM: >0.60 = obese, <0.40 = nonobese) determined by dualenergy X-ray absorptiometry. RMR was determined by using indirect calorimetry. RMR values were compared by using both linear (analysis of covariance) and log-linear (analysis of covariance with log-transformed data) regression to control for differences in FM and FFM. Results: Age, height, and FFM did not differ significantly between groups. Body mass was 13 kg greater and FM was 16 kg greater in the obese boys than in the nonobese boys (P < 0.001). After control for FFM and FM, RMR did not differ significantly between the groups. Conclusion: When body composition is appropriately controlled for, RMR does not differ significantly between obese and nonobese boys.
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Resting metabolic rate in obese and nonobese Chinese Singaporean boys aged 13–15 yBackground: Previous studies investigating the hypothesis that a low resting metabolic rate (RMR) is a cause of obesity yielded discrepant findings. Two explanations for these findings are the use of imprecise methods to determine obesity and a failure to control for differences in fat mass (FM) and fat-free mass (FFM) when comparing RMR values. Objective: This study tested the hypothesis that RMR is lower in obese than in nonobese boys (with the use of precise methods to quantify body fatness and with adjustment for differences in both FM and FFM). Design: Forty Chinese Singaporean boys aged 12.8–15.1 y were recruited. Boys were classified as obese (n = 20) or nonobese (n = 20) on the basis of their adiposity index (ratio of FM to FFM: >0.60 = obese, <0.40 = nonobese) determined by dualenergy X-ray absorptiometry. RMR was determined by using indirect calorimetry. RMR values were compared by using both linear (analysis of covariance) and log-linear (analysis of covariance with log-transformed data) regression to control for differences in FM and FFM. Results: Age, height, and FFM did not differ significantly between groups. Body mass was 13 kg greater and FM was 16 kg greater in the obese boys than in the nonobese boys (P < 0.001). After control for FFM and FM, RMR did not differ significantly between the groups. Conclusion: When body composition is appropriately controlled for, RMR does not differ significantly between obese and nonobese boys.