A Randomized Clinical Trial of Home-based Exercise Combined With a Slight Caloric Restriction on Obesity Prevention Among Women

September 20, 2010 updated by: Rio de Janeiro State University

The study investigated the effectiveness of home-based exercise combined with a slight caloric restriction on weight change during 12 months in non-obese women. In addition the investigators evaluate the effects of baseline insulin resistance on modulation of weight change.

A randomized clinical trial with a factorial design was conducted from 2003 to 2005. Two hundred three middle-aged women (Rio de Janeiro/Brazil), 25-45 years, were randomly assigned to one of two groups: control (CG) and home-based exercise (HB). The HB group received a booklet on aerobic exercise that could be practiced at home (3 times/week - 40 min/session), in low-moderate intensity, during 12 months. Both groups received dietary counseling aimed at a slight energy restriction of 100-300 calories per day.

The HB experienced a greater weight loss in the first 6 months (-1.4 vs. -0.8 kg; p=0.04), but after 12 months there was no differences between groups (-1.1 vs. -1.0; p=0.20). Of the serum biochemical markers, HDL-cholesterol showed major change, with an increase at month 12 of 18.3 mg/dl in the HB compared to 9.5 in the CG (p<0.01). At baseline the non-IR group (n=121) compared to IR (n=64) had similar values of BMI (26.7 vs. 26.3 p=0.21), but statistically significant lower values of waist, glucose, insulin and HOMA-IR, as expected. When the group non-IR and IR were further stratified by GI diet, there were no differences according to diet in both groups. Women classified as IR at baseline had greater weight loss after 12 months of follow-up (-1.62 kg vs. -1.08 kg; p=0.01), and HB exercise helped to reduce weight only among NIR women (-1.51 vs. -0.68; p=0.04); no differences were observed between intervention groups for IR women (-1.54 vs. -1.66; p=0.24). There were no differences between IR and NIR groups for lipid profile after adjustment for weight changes. During follow-up, changes were more pronounced among those women in the high GI diet. These differences were statistically significant for weight and BMI and were greater among the IR compared to the non-IR. Changes in HOMA-IR after 3 months of follow-up were different comparing non-IR with IR at baseline. The IR had a reduction in the HOMA-IR, whereas in the non-IR this value increased (-0.73 vs. +0.37; p=<0.001). Also this reduction was greater among high compared to low GI diet (p=0.04).

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

203

Phase

  • Phase 4

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

25 years to 45 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

Non-obese women aged 25-45 years

Exclusion Criteria:

Physician-diagnosed thyroid disease or diabetes or who were menopausal or any other disease that could be influenced by intervention

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: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: LGI
Low glycemic index
Dietary supplement: Low glycemic index diet
Active Comparator: HGI
High glycemic index
Dietary supplement: High glycemic index diet
Experimental: HB
Home-based exercise
Other: Home-based exercise intervention
Active Comparator: CONTROL
Non-exercisers
Other: Non-exercisers

Collaborators and Investigators

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

Sponsor

Rio de Janeiro State University

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, 2003

Primary Completion (Actual)

October 1, 2005

Study Completion (Actual)

October 1, 2005

Study Registration Dates

First Submitted

September 20, 2010

First Submitted That Met QC Criteria

September 20, 2010

First Posted (Estimate)

September 21, 2010

Study Record Updates

Last Update Posted (Estimate)

September 21, 2010

Last Update Submitted That Met QC Criteria

September 20, 2010

Last Verified

September 1, 2010

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CNPQ500404/2003-8

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.

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