NCT07133542

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

The 9-Box Performance Management Framework: Impacts on Body Weight Regulation and Exercise Behaviors in Graduate Students

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 50 (actual)
• Sponsor: Hainan Normal University · Academic / Other
• Sex: All
• Age: 18 Years – 36 Years
• Healthy volunteers: Not accepted

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

Interventions

Type	Name	Description
BEHAVIORAL	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.
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.

Timeline

• Start date: 2025-04-20
• Primary completion: 2025-06-30
• Completion: 2025-08-09
• First posted: 2025-08-21
• Last updated: 2025-08-21

Locations

1 site across 1 country: China