CONTEXT: There is debate over the independent and combined effects of dieting and increased physical activity on improving metabolic risk factors (body composition and fat distribution). OBJECTIVE: The objective of the study was to conduct a randomized, controlled trial (CALERIE) to test the effect of a 25% energy deficit by diet alone or diet plus exercise for 6 months on body composition and fat distribution. DESIGN: This was a randomized, controlled trial. SETTING: The study was conducted at an institutional research center. PARTICIPANTS: Thirty-five of 36 overweight but otherwise healthy participants (16 males, 19 females) completed the study. INTERVENTION: Participants were randomized to either control (healthy weight maintenance diet, n = 11), caloric restriction (CR; 25% reduction in energy intake, n = 12), or caloric restriction plus exercise (CR+EX; 12.5% reduction in energy intake + 12.5% increase in exercise energy expenditure, n = 12) for 6 months. MAIN OUTCOME MEASURES: Changes in body composition by dual-energy x-ray absorptiometry and changes in abdominal fat distribution by multislice computed tomography were measured. RESULTS: The calculated energy deficit across the intervention was not different between CR and CR+EX. Participants lost approximately 10% of body weight (CR: - 8.3 +/- 0.8, CR+EX: - 8.1 +/- 0.8 kg, P = 1.00), approximately 24% of fat mass (CR: - 5.8 +/- 0.6, CR+EX: - 6.4 +/- 0.6 kg, P = 0.99), and 27% of abdominal visceral fat (CR: 0.9 +/- 0.2, CR+EX: 0.8 +/- 0.2 kg, P = 1.00). Both whole-body and abdominal fat distribution were not altered by the intervention. CONCLUSION: Exercise plays an equivalent role to CR in terms of energy balance; however, it can also improve aerobic fitness, which has other important cardiovascular and metabolic implications.
RCT Entities:
CONTEXT: There is debate over the independent and combined effects of dieting and increased physical activity on improving metabolic risk factors (body composition and fat distribution). OBJECTIVE: The objective of the study was to conduct a randomized, controlled trial (CALERIE) to test the effect of a 25% energy deficit by diet alone or diet plus exercise for 6 months on body composition and fat distribution. DESIGN: This was a randomized, controlled trial. SETTING: The study was conducted at an institutional research center. PARTICIPANTS: Thirty-five of 36 overweight but otherwise healthy participants (16 males, 19 females) completed the study. INTERVENTION: Participants were randomized to either control (healthy weight maintenance diet, n = 11), caloric restriction (CR; 25% reduction in energy intake, n = 12), or caloric restriction plus exercise (CR+EX; 12.5% reduction in energy intake + 12.5% increase in exercise energy expenditure, n = 12) for 6 months. MAIN OUTCOME MEASURES: Changes in body composition by dual-energy x-ray absorptiometry and changes in abdominal fat distribution by multislice computed tomography were measured. RESULTS: The calculated energy deficit across the intervention was not different between CR and CR+EX. Participants lost approximately 10% of body weight (CR: - 8.3 +/- 0.8, CR+EX: - 8.1 +/- 0.8 kg, P = 1.00), approximately 24% of fat mass (CR: - 5.8 +/- 0.6, CR+EX: - 6.4 +/- 0.6 kg, P = 0.99), and 27% of abdominal visceral fat (CR: 0.9 +/- 0.2, CR+EX: 0.8 +/- 0.2 kg, P = 1.00). Both whole-body and abdominal fat distribution were not altered by the intervention. CONCLUSION: Exercise plays an equivalent role to CR in terms of energy balance; however, it can also improve aerobic fitness, which has other important cardiovascular and metabolic implications.
Authors: Charlotte Malis; Eva L Rasmussen; Pernille Poulsen; Inge Petersen; Kaare Christensen; Henning Beck-Nielsen; Arne Astrup; Allan A Vaag Journal: Obes Res Date: 2005-12
Authors: D Enette Larson-Meyer; Leonie K Heilbronn; Leanne M Redman; Bradley R Newcomer; Madlyn I Frisard; Steve Anton; Steven R Smith; Anthony Alfonso; Eric Ravussin Journal: Diabetes Care Date: 2006-06 Impact factor: 19.112
Authors: Robert Ross; Ian Janssen; Jody Dawson; Ann-Marie Kungl; Jennifer L Kuk; Suzy L Wong; Thanh-Binh Nguyen-Duy; SoJung Lee; Katherine Kilpatrick; Robert Hudson Journal: Obes Res Date: 2004-05
Authors: James Rochon; Connie W Bales; Eric Ravussin; Leanne M Redman; John O Holloszy; Susan B Racette; Susan B Roberts; Sai Krupa Das; Sergei Romashkan; Katherine M Galan; Evan C Hadley; William E Kraus Journal: J Gerontol A Biol Sci Med Sci Date: 2010-10-05 Impact factor: 6.053
Authors: Susan B Racette; Sai Krupa Das; Manjushri Bhapkar; Evan C Hadley; Susan B Roberts; Eric Ravussin; Carl Pieper; James P DeLany; William E Kraus; James Rochon; Leanne M Redman Journal: Am J Physiol Endocrinol Metab Date: 2011-11-29 Impact factor: 4.310
Authors: Damon L Swift; Neil M Johannsen; Carl J Lavie; Conrad P Earnest; Timothy S Church Journal: Prog Cardiovasc Dis Date: 2013-10-11 Impact factor: 8.194
Authors: D Enette Larson-Meyer; Leanne Redman; Leonie K Heilbronn; Corby K Martin; Eric Ravussin Journal: Med Sci Sports Exerc Date: 2010-01 Impact factor: 5.411