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Relationships Between Legs Bone Mineral Density, Anthropometry and Jumping Height in Prepubertal Children
Toivo Jürimäe
Tanya Hurbo
Jaak Jürimäe
Sažetak
The aim of this study was to determine how the legs bone mineral density (BMD) is influenced by anthropometry and
vertical jumping height in prepubertal children. In total, 64 8–11-year-old schoolchildren (27 boys and 37 girls) were
studied. All children were at Tanner stage 1. The subjects’ height and body mass were measured and BMI calculated.
The following anthropometric parameters directly connected with leg were measured: skinfolds – front thigh and medial
calf; girths – gluteal, thigh, mid-thigh, calf and ankle; lengths – iliospinale height, trochanterion height, trochanteriontibiale
laterale, tibiale-laterale height and tibiale mediale-spyrion tibiale; and breadths – biiliocristal, foot length and
biepicondylar femur. Total body and legs fat mass and fat %, lean body mass (LBM) and both legs BMD were measured
by DXA. Maximal jumping height was measured on the contact mat. Stepwise multiple regression analysis indicated
that body height in boys (54.6%; R2x100) and body mass in girls (57.3%) were the most important basic anthropometric
parameters that influenced BMD in legs. From the measured skinfolds, that of the front thigh characterized legs BMD by
24.9–35.6%. From the girths, the most important parameter to characterize legs BMD was that of calf (50.0–59.1%). Tibiale
laterale height was the only length parameter which was highly related with legs BMD (51.1–54.5%). Biepicondylar
femur was the most important breadth parameter which characterized legs BMD (51.0–54.8%). Femur breadth and tibiale-
laterale height were selected (68,7%) in boys, and tibiale-laterale height and front thigh skinfold thickness (66,0%)
in girls when all measured leg anthropometric parameters were analyzed together. From the body composition parameters,
the most important parameter to characterize legs BMD was legs LBM (48.9–59.5%). Jumping height did not correlate
with legs BMD in any studied groups. In summary, the present study demonstrated that legs LBM together with tibiale-
laterale height are the main predictors of legs BMD in prepubertal children.
Ključne riječi
legs bone mineral density; leg anthropometry; jumping height; prepubertal children
Hrčak ID:
22732
URI
Datum izdavanja:
8.5.2008.
Posjeta: 1.326 *