Bone Mineral Density and Content among Iranian Elite Male Athletes in Different Sports.

Objectives: Sport is one of the best ways to prevent osteoporosis; however, not all sports have the same impact on bones, for instance, swimming (SW) may have no effect or be harmful. Elite athletes are the best choice to detect the effects of any sport. Thus, this study was conducted firstly to compare the bone mineral density (BMD) and bone mineral content (BMC) of elite athletes in volleyball (VB), basketball (BB), and long-distance running (LR) together, and secondly to compare those corresponding values in SW athletes with those of non-athletes (NA). Methods: The subjects (n=58) of this cross-sectional study included elite male athletes (members of Iran's national teams, with a minimum of 12-15 hours of training per week) and NA (control; C) who were divided into BB, VB, LR, SW (n=12 for each), and C (n=10) groups. The DEXA scan measured the amount of BMD and BMC values in the lumbar spine (LS; L2-L4) and proximal femur (PF; neck, trochanter, and Ward's triangle) areas. Results: In the LS areas, LR had significantly higher BMD than the BB, VB, SW, and C groups (P<0.001), while for BMC, both LR and VB were significantly superior to other groups (P<0.001). Moreover, the BMD and BMC of the PF areas of VB and BB were significantly higher than those of the LR, SW, and C groups (P<0.001). Finally, in all areas, SW showed significantly higher BMD and BMC, compared to the C group (except for trochanter and femur neck BMC) (P<0.05). Conclusion: LR athletes showed the most bone acquisition in the LS areas and VB players in the PF areas, while BB players ranked third in osteoporosis prevention in the mentioned regions. Unexpectedly, SW athletes also had better BMD and BMC than NA; therefore, after weight-bearing sports, this type of sport can be effective in bone acquisition.