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Table 1 Physical characteristics of prepubescent and pubescent boys

From: Effect of maturation on muscle quality of the lower limb muscles in adolescent boys

  Prepubescent Pubescent Effect size (r)
Age, years 13.3 ± 0.5 14.0 ± 0.6* 0.49
Height, cm 152.7 ± 8.5 163.6 ± 6.5* 0.59
Weight, kg 42.2 ± 8.0 51.7 ± 7.2* 0.53
BMI, kg/m 2 18.0 ± 1.8 19.2 ± 1.5* 0.36
Percent body fat, % 13.6 ± 5.2 15.4 ± 3.9* 0.20
LBM, kg 36.2 ± 5.2 43.5 ± 4.7* 0.60
Limb length, cm   
Femur 36.7 ± 2.9 38.6 ± 2.1* 0.10
Lower leg 36.1 ± 2.5 38.2 ± 1.8* 0.45
Muscle thickness, cm   
KE 4.0 ± 0.5 4.6 ± 0.5* 0.49
PF 5.8 ± 0.5 6.4 ± 0.5* 0.53
Muscle volume index, cm 3   
KE 930 ± 390 1318 ± 310* 0.51
PF 649 ± 152 850 ± 139* 0.55
Maximal voluntary joint torque, Nm   
KET 119.5 ± 36.7 160.0 ± 39.0* 0.47
PFT 78.6 ± 26.5 111.7 ± 34.2* 0.46
TQ/MV, Nm/cm 3   
KET/MV 0.14 ± 0.05 0.13 ± 0.03* 0.20
PFT/MV 0.12 ± 0.03 0.13 ± 0.03 0.15
  1. *indicates significant difference between prepubescent and pubescent groups.
  2. BMI, body mass index; KET, knee extension torque; LBM, lean body mass; MV, muscle volume index; PFT, ankle plantar flexion torque; QF, thigh anterior; TQ, maximal voluntary isometric joint torque; TS, posterior of lower leg.