[Trajectory of Body Mass Index and Intervention Strategies Among College Students].

Objective: To analyze the trend of changes in the ranges of body mass index (BMI) among students at a university in Tianjin from 2021 to 2024, and to propose intervention strategies based on the key influencing factors. Methods: A total of 1000 first-year students enrolled in 2021 at a university in Tianjin were randomly selected, and their physical fitness test data over the 4 years of undergraduate study were collected. Differences in physical fitness test results were compared among students with varying BMI ranges. Linear regression analysis was used to identify the key factors affecting changes in BMI ranges in the students. Results: The proportion of underweight students remained relatively stable, decreasing slightly from 2.5% in the first year to 2.0% in the senior year. The proportion of students with normal weight showed a fluctuating downward trend, from 71.5% at college enrollment to 69.0% by the fourth year. In contrast, the proportion of overweight/obese students showed a fluctuating upward trend. In physical fitness tests for the first year, overweight/obese students showed the best performance in the standing long jump test ([2.15 ± 0.42] m, Conclusion: Male students of different BMI ranges should focus on improving their 1000 m run performance, and overweight/obese male students should emphasize standing long jump training as well. Underweight female students should strengthen sit-up training, normal-weight female students should focus on 800 m run training, and overweight/obese females students should strengthen standing long jump training.