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- Title
EFFECT OF DIFFERENT PHYSICAL ACTIVITY ON BONE MINERAL DENSITY IN PUBERTAL GIRLS: THE ROLE OF BODY COMPOSITIONAL AND MUSCLE PERFORMANCE PARAMETERS.
- Authors
Jürimäe, Jaak; Jürimäe, Toivo
- Abstract
The purpose of the present investigation was to examine the effects of different physical loading on bone mineral densities in children that undergo pubertal period. In total, 55 girls, 11 to 13 years of age were investigated. All children were on Tanner stage 2 or 3. Twenty children participated only in school compulsory physical education lessons 2-3 times per week and constituted a control group. Exercise groups were 16 girls who participated in gymnastics four times per week for at least last two years (strength group) and 19 girls who participated in cross-country skiing four times a week for at least last two years (endurance group). The stature and body mass were measured and body mass index was calculated as weight/height² (in kg/m² ). Body composition and bone mineral density were assessed by whole-body dual energy X-ray absorptiometry (DPX-IQ densitometer; Lunar Corp., USA). Maximal counter movement jump and physical working capacity tests on bicycle were also performed. Bone mineral density was significantly higher in strength-trained group compared to other measured groups. While no differences in bone mineral density was observed between endurance-trained and control groups. Counter movement jump was significantly higher in strength-trained girls compared with other groups. In addition, physical working capacity was also significantly better in strength-trained group compared to control group. Bone mineral density was significantly related (r>0.61; p<0.05) to sexual maturation, body fat mass, body fat free mass, counter movement jump and physical working capacity values. Stepwise multiple regression analysis demonstrated that fat free mass (R²=0.384) from body compositional parameters and counter movement jump (R²=0.362) from performance parameters best predicted bone mineral density in pubertal girls. In summary, the results of present study demonstrate that the specific physical activity is needed for the development of...
- Subjects
BONE growth; BONE densitometry; HUMAN body composition; PUBERTY; PHYSICAL anthropology
- Publication
Papers on Anthropology, 2004, Vol 13, p56
- ISSN
1406-0140
- Publication type
Article