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Nutritional Restriction and Activity Thermogenesis

This study has been completed.
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Information provided by:
Mayo Clinic Identifier:
First received: July 21, 2003
Last updated: April 1, 2011
Last verified: April 2011
These studies will provide us with enormous insight regarding how obese patients adapt energetically during negative energy balance. We will gain fundamental information regarding the metabolic implications of combining food restriction with a walking program compatible to that advocated by statutory agencies. These studies will lead to improved understanding of the energetic adaptation that occurs during negative energy balance and how best to treat patients with obesity.

Condition Intervention Phase
Obesity Behavioral: Exercise and behavior modification Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Nutritional Restriction and Activity Thermogenesis

Further study details as provided by Mayo Clinic:

Primary Outcome Measures:
  • Non Exercise Activity Thermogenesis [ Time Frame: Weeks 2 and 11, each period ]

Secondary Outcome Measures:
  • Body weight [ Time Frame: Daily ]
  • Body Composition [ Time Frame: Weeks 2 and 11, each period ]

Enrollment: 90
Study Start Date: June 2003
Study Completion Date: November 2007
Primary Completion Date: November 2007 (Final data collection date for primary outcome measure)
Intervention Details:
    Behavioral: Exercise and behavior modification
    Participants will undergo 1000 kcal/day caloric restriction (relative to experimentally determined weight-maintenance caloric needs) for 8 weeks during one phase of study. Additional 11 week period consists of 8 weeks of caloric restriction with an additional daily walking program.

Ages Eligible for Study:   25 Years to 55 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Ninety sedentary subjects, aged 25-55, who live <10 miles from Rochester will be recruited. This age range has been selected to enable us to study individuals at the peak age-range of obesity and over-weight prevalence and to avoid issues of menopause. Subjects will not be eligible for consideration if they take two or more bouts of exercise/week or participate in sports for more than 2 hours/week. Subjects with predicted weight maintenance energy requirements of <2000 kcal/day will have been excluded at screening. This is because when we come to underfeeding by 1000 kcal/day, we want to avoid feeding any volunteer <1000 kcal/day, for safety & compliance reasons.

(A) LEAN: 30 (15F,15M) lean subjects; BMI <25 kg/m2. Each lean subject will be individually matched for height (+3cm) and age (+3 years) to an obese subject so as to establish comparable groupings for body size. Subjects will have been weight-stable for six months (B) OBESE: 30 (15F,15M) obese subjects; BMI 30-35 kg/m2. Subjects will have been weight-stable for six months (C) POST-OBESE: 30 (15F,15M) patients will have had a previous BMI >30 kg/m2 and a weight loss sufficient to achieve a BMI of <26 kg/m2 maintained for at least 2 months (with weight fluctuation during this period of <1 kg) (94). We will attempt to match these subjects to the obese subjects as described above.

  Contacts and Locations
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Please refer to this study by its identifier: NCT00065338

United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55905
Sponsors and Collaborators
Mayo Clinic
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Principal Investigator: James A Levine, M.D., Ph.D. Mayo Clinic
  More Information

Responsible Party: James A. Levine, M.D., Ph.D., Consultant, Mayo Clinic Identifier: NCT00065338     History of Changes
Other Study ID Numbers: DK63226 (completed)
R01DK063226 ( U.S. NIH Grant/Contract )
Study First Received: July 21, 2003
Last Updated: April 1, 2011

Keywords provided by Mayo Clinic:
Physical activity processed this record on August 17, 2017