Circuit Training and Motivational Interviewing to Reduce Type 2 Diabetes in Youth

September 20, 2017 updated by: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

The overall goal of this project is to examine the physiological and metabolic effects of a 16-week circuit-training (strength training + aerobic activities) program, with and without a behavioral component utilizing motivational interviewing, in 45 overweight Latina adolescent girls (14-18 years of age). This 16-week randomized control study will examine the incremental effects of the following 3 intervention groups on insulin sensitivity, insulin secretion, adiposity, and habitual and ad libitum physical activity:

  • Control group (delayed circuit training intervention; n=15)
  • Circuit training group (strength + aerobic training; 2 times per week; n=15)
  • Circuit training (same as above) + weekly motivational interviewing sessions (n=15)

Specific Aim 1: To examine the effects of a 16-week circuit training program on adiposity, insulin dynamics, other associated hormones and adipocytokines, cardiorespiratory fitness, and muscular strength in overweight Latina adolescent girls. Hypothesis 1: Participation in the circuit-training program will result in significant improvements in both physiological and metabolic outcomes, including: a) body composition as measured by DEXA, b) fat distribution as measured by MRI, c) adipose tissue hormones (e.g. leptin, adiponectin, TNF-α) as measured by fasting blood samples, d) insulin sensitivity and secretion as measured by frequently sampled intravenous tolerance test, e) aerobic fitness as measured by the single stage submaximal treadmill test, and f) increase muscular strength as measured by repetition maximums.

Specific Aim 2: To examine the incremental effects of adding the motivational interviewing sessions to the circuit training on self-selected ad libitum physical activity during a 5-hour observational period, habitual physical activity levels using 7 day accelerometry, and the meanings and motivation to exercise using questionnaires before and after the intervention. Hypothesis 2: The addition of motivational interviewing will encourage and empower participants to be more active outside of the intervention and foster healthy physical activity behaviors in daily life. Improvements in physical activity behaviors will lead to greater improvements in all other health outcomes listed in specific aim 1 compared to circuit training alone and control group.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

45

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Los Angeles, California, United States, 90033
        • Veronica Atkins Lifestyle Intervention Laboratory

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

14 years to 18 years (Child, Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • At Risk of Overweight and Overweight (age- & sex-specific body mass index ≥ 85th percentile based on CDC BMI growth charts [US Department of Health and Human Services, 2000]. There will not be an upper BMI limit. In our experience, we have had numerous children above the 99th percentile for BMI complete the outcome measures, and this group could benefit greatly from participation.
  • Gender & Age: Females from grades 9th to 12th (approximately 14-18 years of age). We chose to study adolescents because pubertal youth will likely possess the requisite hormonal milieu needed to elicit physiologically and metabolic changes in response to resistance and aerobic training. In addition physical activity declines are more pronounced in minority females. By limiting the study to just females, we will retain a more homogenous group. This will eliminate sensitive gender issues related to exercise such as body image concerns, goal setting, and motivations for behavioral changes. To reduce effects of the menstrual cycle, all females will be tested during the follicular phase, while those with irregular/unpredictable menses will be studied at random times.
  • Latino origin all four grandparents must be of Hispanic heritage (reported on screening forms). This approach is consistent with all of our previous and ongoing work.

Exclusion Criteria:

  • Presently taking medication(s) or diagnosed with any syndrome or disease that could influence physical activity, body composition and fat distribution, or insulin action.
  • Previously diagnosed with any major illness since birth (e.g. chronic birth asphyxia, cancer, etc.).
  • Children with type 1 and/or type 2 diabetes will be excluded and referred to a physician. Children with impaired glucose tolerance (fasting glucose >100 mg/dL during a fasting blood draw) and/or conditions associated with insulin resistance (e.g. acanthosis nigricans, hypertension, dyslipidemia) will be eligible, as long as they are not receiving treatment and meet other eligibility criteria.
  • Children who have any physical, cognitive, or psychological disabilities that would prevent them from participating in an exercise program.
  • Currently, or in the past 6 months, involved with any dietary, physical activity or weight loss program.
  • Children who live farther than 20 miles away from the GCRC.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control
No intervention
Experimental: Circuit Training
Participants received CT exercise training two times per week for approximately 60-90 min per session for 16 wk
Behavioral: Circuit Training
Circuit Training (aerobic + strength training 2 times per week for 16 weeks)
Other Names:
  • CT
Experimental: Circuit training + motivational interviewing
Participants in the CT + MI group received the same CT classes but also received four individual MI and four group MI sessions throughout the 16-wk program by two trained research staff
Behavioral: Circuit training + motivational interviewing
Circuit training (aerobic + strength training 2 times per week for 16 weeks) + motivational interviewing (4 individual + 4 group sessions)
Other Names:
  • CT + MI

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Insulin sensitivity
Time Frame: post intervention (week 16)
post intervention (week 16)

Secondary Outcome Measures

Outcome Measure
Time Frame
Change in waist circumference
Time Frame: post-intervention (week 16)
post-intervention (week 16)
Change in subcutaneous abdominal adipose tissue
Time Frame: post-intervention (week 16)
post-intervention (week 16)
Change in visceral abdominal adipose tissue
Time Frame: post-intervention (week 16)
post-intervention (week 16)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

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

Investigators

  • Principal Investigator: Jaimie N Davis, PhD, RD, University of Southern California

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

October 1, 2007

Primary Completion (Actual)

August 31, 2010

Study Completion (Actual)

August 31, 2012

Study Registration Dates

First Submitted

June 5, 2008

First Submitted That Met QC Criteria

June 5, 2008

First Posted (Estimate)

June 9, 2008

Study Record Updates

Last Update Posted (Actual)

September 25, 2017

Last Update Submitted That Met QC Criteria

September 20, 2017

Last Verified

September 1, 2017

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • K01DK078858 (U.S. NIH Grant/Contract)

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Subscribe