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Modifying Obesogenic Homes: Impact on Weight Maintenance

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00200330
Recruitment Status : Unknown
Verified September 2005 by The Miriam Hospital.
Recruitment status was:  Active, not recruiting
First Posted : September 20, 2005
Last Update Posted : April 18, 2007
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by:
The Miriam Hospital

Brief Summary:
The obesity epidemic observed in recent years can be largely attributed to an obesogenic environment that encourages overeating and sedentary lifestyles. Behavioral weight control treatment, the most empirically validated intervention approach, produces initial weight losses of 10%; however, maintenance of initial weight loss and behavior change has not been achieved. These disappointing long-term results may reflect the fact that participants are given only minimal, indirect instruction on how to change their environment to support their new weight-regulating behaviors. While in theory, the behavioral model emphasizes environmental antecedents and consequences of eating and exercise, in practice, only 1 to 2 sessions in standard treatment are dedicated to stimulus control-types of skills. By teaching weight control skills in a contextual vacuum, participants remain vulnerable to the same environmental influences that maintained their unhealthy eating and exercise habits. Given that the majority of eating and exercise is home-based, a logical step in strengthening behavioral treatment and moving toward an ecological model of behavior is to expand the focus of treatment from the individual to the individual plus their home environment. We propose to test the long-term impact of a behavioral weight control program designed to directly modify both the physical and social home environment of weight loss participants. Two hundred overweight and obese men and women will be randomly assigned to either 18 months of standard behavioral treatment (SBT) or 18 months of standard behavioral treatment plus direct modifications to the home environment (SBT+Home). SBT+Home will incorporate many strategies that have shown promise in improving weight loss (e.g., food and exercise equipment provision, spouse involvement) but will be the first to study both physical and social factors within the home simultaneously and will be the longest examination of the home environment conducted to date. Participants and spouses will be assessed at baseline, 6, 12, and 18 months. We hypothesize that by broadening the focus of treatment from the individual to the individual plus their home environment, SBT+Home will produce both better long-term weight loss and better maintenance of initial weight loss and behavior change. This home environmental approach, if successful, has potential applications to the maintenance of other important health behaviors.

Condition or disease Intervention/treatment Phase
Obesity Behavioral: Behavioral weight loss treatment Behavioral: Behavioral and home environment weight loss treatment Not Applicable

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Study Type : Interventional  (Clinical Trial)
Enrollment : 400 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Study Start Date : November 2004
Estimated Study Completion Date : April 2008

Resource links provided by the National Library of Medicine

Primary Outcome Measures :
  1. Weight loss

Secondary Outcome Measures :
  1. Diet composition
  2. Physical activity
  3. Changes in home environment

Information from the National Library of Medicine

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Ages Eligible for Study:   21 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • are between 21-70 years of age.
  • have a body mass index (BMI) between 25-50 kg/m2 .
  • live with another overweight adult who is between 18-70 years of age and has a BMI between 25-50 kg/m2 and who is willing to participate in the study

Exclusion Criteria:

  • report a heart condition, chest pain during periods of activity or rest, or loss of consciousness on the Physical Activity Readiness Questionnaire (PAR-Q; items 1-4). Individuals endorsing joint problems, prescription medication usage, or other medical conditions that could limit exercise will be required to obtain written physician consent to participate.
  • report conditions that in the judgment of the Principal Investigator would render them potentially unlikely to follow the protocol for 18 months including an illness likely to be terminal within 18 months, plans to move out of the area, substance abuse or other significant psychiatric problems, or dementia.
  • report being unable to walk 2 blocks (1/4 mile) without stopping.
  • are currently participating in a weight loss program and/or taking a weight loss medication.
  • are currently pregnant or intend to become pregnant in the next 18 months.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00200330

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United States, Rhode Island
Weight Control and Diabetes Research Center, The Miriam Hospital
Providence, Rhode Island, United States, 02903
Sponsors and Collaborators
The Miriam Hospital
National Heart, Lung, and Blood Institute (NHLBI)
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Principal Investigator: Amy Gorin, Ph.D. The Miriam Hospital
Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
Layout table for additonal information Identifier: NCT00200330    
Other Study ID Numbers: R01HL077082 ( U.S. NIH Grant/Contract )
First Posted: September 20, 2005    Key Record Dates
Last Update Posted: April 18, 2007
Last Verified: September 2005
Keywords provided by The Miriam Hospital:
weight loss
physical activity
home environment