| Objective To explore the effect of different exercise level on bone mineral density (BMD) and body composition in college students, and to analyze the correlation between BMD and body composition. Methods A total of 120 college students of China University of Mining and Technology were divided into 3 groups according to the exercise level, the lack of exercise group, the common exercise group, and the heavy exercise group, with 20 male students and 20 female students in each group. BMD and body composition were respectively tested using ultrasonic method and the biological resistance method. The data were analyzed with a SPSS16.0 software. Results The BMD in the common exercise group was obviously higher than that in the other two groups (P<0.05). Comparing to that in the lack of exercise group, PBF in the common exercise and the heavy exercise group decreased significantly (P<0.05), but LBM and SLBM increased significantly. The M in the common exercise increased significantly (P<0.05). LBM/W, SLBM/W, and M of each group was highly and positively associated with BMD (P<0.05). Conclusion Moderate exercise increases BMD of the students, while heavy exercise decreases BMD and does not benefit to the growth of bone. Exercise improves body composition, reduces fat content, increases lean body mass, and prevents obesity in college students. |