Contingency Management for Decreasing Caloric Intake in University Students: 1996

ORCID

Courtney Jensen: 0000-0001-9774-0694

Document Type

Conference Presentation

Department

Health, Exercise, and Sport Sciences Department

Conference Title

2011 ACSM National Conference

Organization

American College of Sports Medicine (ACSM)

Location

Denver, CO

Conference Dates

May 31 - June 4, 2011

Date of Presentation

May 2011

Journal Publication

Medicine and Science in Sports and Exercise

ISSN

1530-0315

DOI

10.1249/01.mss.0000401396.63428.e7

Volume

43

Issue

5

Publication Date

2011-05-01

Abstract

PURPOSE: Rates of overweight and obesity are increasing with 65% of university students being overweight or obese. We examined whether adding Contingency Management (CM), a behavioral intervention that provides tangible reinforcement for completion of target behaviors, to a manual guided behavioral weight loss program with supportive counseling would make the weight loss intervention more effective in decreasing caloric intake among university students with overweight and obesity. METHODS: Eleven overweight and obese students (7 women, 4 men) (25.5± 2.3y, BMI of 30.8± 2.8kg/m2) were randomized into one of two conditions: (a) standard counseling, which included weekly weigh-ins and supportive counseling focused on increasing exercise and decreasing caloric intake (n=4, SC); or (b) SC plus CM that included weekly contracting and tangible reinforcement for verified exercise and calorie intake (n= 7, SC+CM). Participants recorded daily food intake on food diaries that indicated frequency, portion size, and type of food. Subsequently, investigators calculated daily (kcal/d), weekly (kcal/wk), and monthly (kcal/m) caloric intake from food diary data using an online database. Repeated measures ANCOVA tested for differences in weekly caloric intake within and between groups (SC vs. SC+CM) at baseline and over 1 month by gender with baseline BMI as a covariate. RESULTS: SC+CM decreased caloric intake by 738.6±143.9kcal/m, whereas SC decreased caloric intake by 241.7±172.3kcal/m over 1 month. There was a favorable trend toward significance with a group*gender interaction (p=0.07). Men in SC+CM (n=2) tended to decrease caloric intake more than SC (n=2) over 1 month, 1170±224.1kcal/m vs. 299.1±219.3kcal/m, respectively. Among women, there were no differences in decreased caloric intake between groups over 1 month, SC+CM (n=5) 174.7±124.1kcal/m vs. SC (n=2) 171.7±198.8kcal/m. CONCLUSION: SC+CM decreased monthly caloric intake about 500kcal more than SC over the 1 month monitoring period. The favorable effects of SC+CM on caloric reduction compared to SC were largely attributed to the men. Reasons for these gender differences are not readily apparent and will require further monitoring as part of an ongoing 24wk monitoring period.

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