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
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
DIAGNOSTIC
Masking
TRIPLE
Enrollment
50
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.
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.
Hainan Normal University
Haikou, Hainan, China
Change in Waist-to-Hip Ratio (WHR)
Time frame: Baseline, Week 4, Week 8
Body Mass Index (BMI)
Time frame: Baseline, Week 8
Adherence to exercise
Exercise adherence will be assessed using the standardized Exercise Adherence Rating Scale (EARS). This validated, self-reported questionnaire comprises 16 items. The first 6 items directly assess participants' behavioral adherence to the prescribed exercise regimen (e.g., session attendance, duration). The subsequent 10 items evaluate reasons for adherence or non-adherence, capturing key cognitive dimensions such as perceived barriers and motivation. All items are rated on a 5-point Likert scale ranging from "Completely Agree" (scored as 0) to "Completely Disagree" (scored as 4). Total scores are calculated such that higher scores indicate better exercise adherence.
Time frame: Week 4, Week 8
Body Fat Percentage
Time frame: Baseline, Week 4, Week 8
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