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

Table 1 Physical characteristics of prepubescent and pubescent 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

*indicates significant difference between prepubescent and pubescent groups.
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.

ISSN: 1880-6805