Environmental Intervention for Weight Gain Prevention (HealthWorks)

• ClinicalTrials.gov Identifier: NCT00708461
• Recruitment Status: Completed
• First Posted: July 2, 2008
• Results First Posted: July 18, 2013
• Last Update Posted: November 1, 2019
• Sponsor: University of Minnesota
• Collaborator: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
• Information provided by (Responsible Party): University of Minnesota

Study Description

Brief Summary:

The primary aim of this research is to evaluate the efficacy of a multicomponent worksite-based, environmental intervention in reducing weight increase and obesity over time in working adults.

Condition or disease	Intervention/treatment	Phase
Obesity	Behavioral: weight gain prevention	Not Applicable

Detailed Description:

This study is a randomized trial designed to evaluate the effectiveness of a multi-component worksite intervention with strong environmental components to prevent weight gain. Six worksites will be randomized to either an intervention or a no-treatment control group. The intervention will be comprised of 1) changing the availability, portion sizes, and prices of foods and beverages sold to employees in their worksites in ways that encourage healthier food choices; 2) increasing the availability of physical activity opportunities at the worksite by implementing walking programs and increasing stairwell access and attractiveness; 3) placing scales in the work environment to encourage body weight monitoring and to enable workers to set goals for their weight; and 4) to provide educational materials to all employees to make them aware of the environmental intervention and of behavioral practices likely to be effective in preventing weight gain. The intervention will be implemented for a 2-year period in each intervention site. Effectiveness will be evaluated by assessing body weight, eating behavior and physical activity in a cohort of employees in both control and intervention sites at baseline and again 2 years later. Weight trends in these populations will also be compared to data from national and state-level annual surveys of weight in representative population samples. Data will be collected on the effects of specific intervention components via aggregate measures of food choice and physical activity.

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 1747 participants
• Allocation: Randomized
• Intervention Model: Parallel Assignment
• Masking: None (Open Label)
• Primary Purpose: Prevention
• Official Title: Environmental Intervention for Weight Gain Prevention
• Study Start Date: January 2006
• Actual Primary Completion Date: March 2009
• Actual Study Completion Date: March 2010

Arms and Interventions

Arm	Intervention/treatment
Experimental: Worksite Environmental Intervention; Changes to healthy food availability, physical activity opportunities and promotion, body weight scale access, and media enhancements to target weight gain prevention	Behavioral: weight gain prevention; Changes in the food environment that increase the availability of healthy foods and beverages, reduce food and beverage portion sizes, reduce prices on healthy food items, and increase prices on less healthy food items.; Changes in the activity environment that increase cues and incentives for walking at work and at home, using stairs, and to increase exposure of employees to information about active recreational opportunities at work and at home.; Changes to the environment to increase cues and incentives for regular weight monitoring by providing scales at convenient locations.; Changes in the informational environment that increase frequency of exposure of the employee population to accurate information about healthy food and activity choices.; Other Names: worksite intervention; obesity prevention
No Intervention: No-contact control; No-treatment control condition. Worksites were offered program materials upon completion of programs at intervention sites.

Outcome Measures

Primary Outcome Measures :

1. Change in Body Mass Index (BMI) [ Time Frame: Baseline to 24 months ]
   Assessed in kilograms per meter squared.

Eligibility Criteria

• Ages Eligible for Study: 18 Years to 70 Years (Adult, Older Adult)
• Sexes Eligible for Study: All
• Accepts Healthy Volunteers: Yes

Criteria

Inclusion Criteria:

• age 18 or older
• generally in good health
• part- or full-time employee in one of the participating worksites

Exclusion Criteria:

• work on site <50% of the time
• work second or third shift

Contacts and Locations

Locations

United States, Minnesota

University of Minnesota

Minneapolis, Minnesota, United States, 55454

Sponsors and Collaborators

University of Minnesota

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

Investigators

• Principal Investigator: Robert W Jeffery, PhD; University of Minnesota, Division of Epidemiology and Community Health

More Information

Additional Information:

HealthWorks is a study housed in the University of Minnesota Obesity Prevention Center. 

Publications of Results:

VanWormer JJ, Linde JA, Harnack LJ, Stovitz SD, Jeffery RW. Weight change and workplace absenteeism in the HealthWorks study. Obes Facts. 2012;5(5):745-52. doi: 10.1159/000345119. Epub 2012 Oct 24.

Linde JA, Nygaard KE, MacLehose RF, Mitchell NR, Harnack LJ, Cousins JM, Graham DJ, Jeffery RW. HealthWorks: results of a multi-component group-randomized worksite environmental intervention trial for weight gain prevention. Int J Behav Nutr Phys Act. 2012 Feb 16;9:14. doi: 10.1186/1479-5868-9-14.

VanWormer JJ, Linde JA, Harnack LJ, Stovitz SD, Jeffery RW. Is baseline physical activity a determinant of participation in worksite walking clubs? Data from the HealthWorks Trial. J Phys Act Health. 2012 Aug;9(6):849-56. doi: 10.1123/jpah.9.6.849. Epub 2011 Jul 29.

VanWormer JJ, Linde JA, Harnack LJ, Stovitz SD, Jeffery RW. Self-weighing frequency is associated with weight gain prevention over 2 years among working adults. Int J Behav Med. 2012 Sep;19(3):351-8. doi: 10.1007/s12529-011-9178-1.

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Graham DJ, Linde JA, Cousins JM, Jeffery RW. Environmental modifications and 2-year measured and self-reported stair-use: a worksite randomized trial. J Prim Prev. 2013 Dec;34(6):413-22. doi: 10.1007/s10935-013-0323-2.

• Responsible Party: University of Minnesota
• ClinicalTrials.gov Identifier: NCT00708461
• Other Study ID Numbers: 0408S62609; 5R01DK067362 ( U.S. NIH Grant/Contract )
• First Posted: July 2, 2008
• Results First Posted: July 18, 2013
• Last Update Posted: November 1, 2019
• Last Verified: October 2019

Keywords provided by University of Minnesota:

obesity; obesity prevention; worksite; environment; intervention

Additional relevant MeSH terms:

Obesity; Weight Gain; Overweight; Overnutrition; Nutrition Disorders; Body Weight; Body Weight Changes