چکیده:
Purpose: The aim of this study was to investigate the relationships between body weight and Body Mass Index (BMI) and Bone Mineral Density (BMD) of the lumbar spine and femoral neck in professional cyclists of Iran and Tour-de-France.Material and Methods: 40 professional cyclists [(13 professional cyclists having participated in Iran’s first class cycling competitions and 27 professional cyclists of Tour-de-France, age26.17±4.23 yr, height 178.85±7.09 cm, weight 72.50±9.48 kg, cycling participation background 7±2.4 yr) )] took part in this study. Data were collected using the BMD assessing device Dual Energy X-Ray Absorptiometry (DXA). A medical history form was also filled out by a specialist physician. In this research BMD of the lumbar vertebral and femoral neck was measured. Data analysis included descriptive and inferential (Pearson-Correlation Coefficient) statistics was done using SPSS software.Results: The results of this study showed that there was not any significant relationships between BMI and body weight, and BMD of the lumbar spine and femoral neck in professional cyclists (p>0.05).Discussion and Conclusion: Therefore, BMI and body weight are not good predictors of BMD inprofessional cyclists. However further studies are required to investigate the effect of other factors such asexposure to sunlight, calcium intake, and individual habits like diet, on the BMD of professional cyclists.
خلاصه ماشینی:
"Results: The results of this study showed that there was not any significant relationships between BMI and body weight, and BMD of the lumbar spine and femoral neck in professional cyclists (p>0.
Johnov (1994) hypothesized that since a large portion of body weight is exerted on lumbar vertebral and femoral neck, and the highest probability of osteoporosis-induced fracture is seen in these limbs, their bone density can be considered as an index for evaluating the total BMD [13].
The present study, therefore, was conducted to assess the relationships between body weight and BMI, and BMD of the lumbar spine and femoral neck in professional cyclists of Iran and Tour-de-France.
Results The data presented in Table 1, indicated that there were no significant relationship between BMI and body weight, and BMD of the lumbar spine and femoral neck in professional cyclists (p>0.
(رجوع شود به تصویر صفحه) (رجوع شود به تصویر صفحه) Discussion and Conclusion Results of the present study indicated that there were no significant relationships between BMI and body weight, and BMD of the lumbar spine and femoral neck in professional cyclists so BMI and body weight may not be good predictors of BMD.
Since the cyclists in this study had normal BMI values (19 to 25; according to WHO definition) and cycling is a non-weight-bearing exercise, the exerted weight stress on the lumbar vertebral and femoral neck of the participants was apparently not enough to stimulate osteoblasts in these two body parts.
In general, our results showed that body weight and BMI cannot be good predictors of the lumbar vertebral and hip bone BMD in professional cyclists."