Table 1. Descriptive statistics for age, body height, body mass, and peak height velocity (PHV) offset for experimental (EXP) and control (CON) groups. Data are expressed as mean ± SD. Maturity group Treatment group Sample size Age (years) Height (cm) Body mass (kg) PHV offset years) Pre-PHV EXP 26 13.1 ± 0.6 159.8 ± 6.3 49.4 ± 8.7 -1.0 ± 0.5 CON 33 13.2 ± 0.5 163.0 ± 7.2 54.1 ± 10.7 -0.7 ± 0.5 Post-PHV EXP 24 14.0 ± 0.4 176.3 ± 6.8 68.5 ± 10.2 0.8 ± 0.4 CON 19 13.9 ± 0.5 174.7 ± 7.0 65.3 ± 11.7 0.6 ± 0.5 There were no significant differences between EXP and CON groups of pre-PHV and post-PHV maturity groups (all p=0.081-0.451). Post-PHV boys in the EXP group were chronologically older, taller and heavier than their counterparts in the pre-PHV EXP group (all p<0.001), and post-PHV boys in the CON group were chronologically older, taller and heavier than their counterparts in the pre-PHV CON group (all p<0.001-0.001).