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Table 2 Anthropometry, bone mineral parameters and biomechanical calculations of femoral neck.

From: A school-curriculum-based exercise intervention program for two years in pre-pubertal girls does not influence hip structure

  Intervention control p-value
   Baselinea (N = 42) (N = 43)  
Total body    
Weight (kg) 27.8 (5.4) 26.5 (4.3) 0.22
Height (cm) 128.8 (5.1) 128.7 (7.5) 0.94
Lean mass (kg) 20.1 (2.3) 20.0 (2.6) 0.90
Fat mass (kg) 5.3 (3.7) 4.5 (2.4) 0.28
Femoral neck    
BMC (g) 2.524 (0.468) 2.536 (0.497) 0.91
BMD (g/cm2) 0.722 (0.091) 0.701 (0.090) 0.30
Cross-sectional area (CSA, cm2) 0.909 (0.141) 0.889 (0.152) 0.54
Periosteal width (cm) 2.424 (0.162) 2.463 (0.225) 0.37
Section modulus (Z, cm3) 0.279 (0.064) 0.272 (0.082) 0.66
Cross-sectional moment of inertia (CSMI, cm4) 0.341 (0.096) 0.338 (0.130) 0.90
   Follow-Up (N = 42) (N = 43)  
Total body    
Weight (kg) 35.6 (8.0) 32.5 (5.7) 0.04
Height (cm) 141.0 (6.5) 139.7 (8.0) 0.45
Lean mass (kg) 24.6 (3.5) 23.6 (3.0) 0.18
Fat mass (kg) 8.9 (5.8) 6.3 (3.4) 0.01
Femoral neck    
BMC (g) 3.146 (0.506) 3.030 (0.518) 0.30
BMD (g/cm2) 0.803 (0.080) 0.789 (0.103) 0.50
Cross-sectional area (CSA, cm2) 1.100 (0.175) 1.067 (0.187) 0.41
Periosteal width (cm) 2.640 (0.226) 2.593 (0.190) 0.30
Section modulus (Z, cm3) 0.377 (0.085) 0.368 (0.099) 0.66
Cross-sectional moment of inertia (CSMI, cm4) 0.506 (0.154) 0.483 (0.159) 0.49
   Annual Changes (N = 42) (N = 43)  
Total body    
Weight (kg) 3.9 (1.6) 3.0 (1.1) 0.006
Height (cm) 6.0 (1.1) 5.6 (0.9) 0.06
Lean mass (kg) 2.3 (0.8) 1.8 (0.5) 0.003
Fat mass (kg) 1.8 (1.3) 0.9 (0.7) 0.001
Femoral neck    
BMC (g) 0.310 (0.234) 0.252 (0.236) 0.25
BMD (g/cm2) 0.040 (0.033) 0.045 (0.042) 0.62
Cross-sectional area (CSA, cm2) 0.095 (0.065) 0.091 (0.078) 0.77
Periosteal width (cm) 0.107 (0.107) 0.067 (0.113) 0.10
Section modulus (Z, cm3) 0.049 (0.030) 0.049 (0.042) 0.98
Cross-sectional moment of inertia (CSMI, cm4) 0.082 (0.057) 0.074 (0.067) 0.54
  1. Comparison between the intervention group (n = 42) and the control group (n = 43) in anthropometrics, bone mineral parameters and biomechanical calculations in femoral neck at baseline, at two year follow-up and in annual changes during the follow-up period. Data presented as mean ± SD.
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