A Waist Circumference and Body Fat Percentage Dual-Dimension Nine-Square Grid Model for Precision Obesity Management: A Randomized Controlled Trial in Overweight/Obese University Students

NCT ID: NCT07133542

Last Updated: 2025-08-21

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 50 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-04-20
• Study Completion Date: 2025-08-09

Brief Summary

The goal of this randomized controlled trial is to test whether a dual-dimensional 9-grid matrix intervention improves body composition and exercise adherence compared to standard aerobic exercise in overweight/obese college students. The main questions it aims to answer are:

Does the 9-grid model optimize fat distribution (measured by waist-hip ratio) and sustain body fat reduction better than traditional exercise?

Does dynamic risk stratification in the 9-grid system enhance long-term exercise adherence?

How does spatial migration of participants within the grid (quantified by centroid index G) reflect intervention efficacy?

Researchers will compare the 9-grid management group (receiving dynamic positioning + 5-tier personalized strategies) to the control group (receiving standardized aerobic exercise) to see if the 9-grid model:

Reduces waist-hip ratio more effectively

Delays intervention plateau in body fat loss

Increases exercise adherence at 8 weeks

Participants will:

Undergo body measurements (weight, body mass index (BMI), body fat percentage, waist/hip circumference) at baseline, 4 weeks, and 8 weeks

Complete the Exercise Adherence Rating Scale (EARS) at 4 and 8 weeks

If in 9-grid group:

• Be classified into 1 of 9 grid zones every 2 weeks based on waist circumference risk + body fat status
• Receive zone-specific interventions (nutrition/exercise/behavioral guidance)

If in control group:

• Perform progressive aerobic exercise (40-90% heart rate reserve (HR) 3×/week
• Use heart rate monitors for intensity tracking

Conditions

Overweight and/or Obesity

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: TRIPLE

Study Groups

Dynamic Nine-Grid Matrix Group

Tiered management via waist-risk/body-fat matrix. Participants receive bi-weekly health positioning and one of five precision strategies (e.g., high-intensity exercise + dietary control for Grid-I; low-intensity maintenance for Grid-IX). Real-time feedback via digital dashboard.

Group Type: EXPERIMENTAL

Dynamic Matrix Management for Weight Control (DMM-WC)

Intervention Type: BEHAVIORAL

Precision weight management using a two-dimensional grid model. Participants undergo bi-weekly positioning on a waist risk-body fat matrix (9 grids), receiving tiered interventions (e.g., high-intensity exercise + dietary control for high-risk grids; maintenance plans for low-risk grids). Real-time progress feedback via visual spatial migration maps promotes adherence. Comparator group receives standardized aerobic prescription without dynamic adjustments.

Standard Aerobic Prescription Group

Standardized progressive aerobic exercise at 40-90% heart rate reserve. Intensity/volume are personalized at baseline but remain static afterward. Adherence monitored using Huawei wearables (no dynamic adjustments or tiered feedback).

Group Type: PLACEBO_COMPARATOR

Standard Aerobic Prescription

Intervention Type: BEHAVIORAL

Personalized progressive aerobic exercise program. Participants receive baseline-adjusted intensity prescriptions (40-90% heart rate reserve), with adherence monitored via wearable devices. NO dynamic adjustments, tiered strategies, or visual feedback are provided throughout the 8-week intervention.

Interventions

Dynamic Matrix Management for Weight Control (DMM-WC)

Precision weight management using a two-dimensional grid model. Participants undergo bi-weekly positioning on a waist risk-body fat matrix (9 grids), receiving tiered interventions (e.g., high-intensity exercise + dietary control for high-risk grids; maintenance plans for low-risk grids). Real-time progress feedback via visual spatial migration maps promotes adherence. Comparator group receives standardized aerobic prescription without dynamic adjustments.

Intervention Type: BEHAVIORAL

Standard Aerobic Prescription

Personalized progressive aerobic exercise program. Participants receive baseline-adjusted intensity prescriptions (40-90% heart rate reserve), with adherence monitored via wearable devices. NO dynamic adjustments, tiered strategies, or visual feedback are provided throughout the 8-week intervention.

Intervention Type: BEHAVIORAL

Eligibility Criteria

Inclusion Criteria

1. Age & Status:

• Full-time university students aged 18-36 years

2. Overweight/Obesity Diagnosis (per Chinese criteria):

• Males: Body Mass Index (BMI) ≥24 kg/m² AND waist circumference ≥85 cm
• Females: Body Mass Index (BMI) ≥24 kg/m² AND waist circumference ≥80 cm

3. Exercise Capacity:

• Able to safely perform moderate-intensity exercise (confirmed by Physical Activity Readiness Questionnaire [PAR-Q], all items "No")

4. Tech Compliance:

• Own smartphone with proficiency in health apps (e.g., WeChat Sport)

5. Informed Consent:

• Signed written consent with commitment to complete 12-week intervention

Exclusion Criteria

1. Metabolic Diseases:

• Diagnosed diabetes, thyroid dysfunction, or history of cardiovascular disease

2. Exercise Contraindications:

• Orthopedic/neurological conditions limiting exercise

3. Confounding Medications:

• Use of weight/metabolism-affecting drugs in past 3 months

4. Special Physiological Status:

• Pregnancy or lactation

5. Conflicting Participation:

• Concurrent enrollment in other weight-management trials

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 36 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Hainan Normal University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

Hainan Normal University

Haikou, Hainan, China

Countries

China

Provided Documents

Document Type: Informed Consent Form

View Document

Other Identifiers

AQNU2024111

Identifier Type: -

Identifier Source: org_study_id