149 Growing up and reaching for the top: A longitudinal study of talented swimmers 7 Table 1. Descriptive characteristics of male and female swimmers according to their age category and performance level group at late junior age. Males (N=47) Females (N=43) High-performing late juniors Lower-performing late juniors Effect sizes High-performing late juniors Lower-performing late juniors Effect sizes M ± SD M ± SD d M ± SD M ± SD d All Age of peak height velocity (APHV) 13.1 ± 0.4 13.2 ± 0.5 -0.3 11.5 ± 0.3 * 11.7 ± 0.3 -0.9 rST at late junior age (%) 112.0 ± 2.3 *** 123.6 ± 6.4 -2.3 114.1 ± 1.9 *** 123.3 ± 6.1 -1.7 12 years Age (years) - - - 12.4 ± 0.3 12.5 ± 0.3 -0.2 Swim training (hours per week) - - - 7.8 ± 1.4 6.9 ± 2.2 0.4 Height (cm) - - 167.8 ± 7.3 164.1 ± 5.0 0.7 CMJ (cm) - - - 42.7 ± 5.0 42.0 ± 4.0 0.2 rMSV (%) - - - 95.6 ± 3.4 *** 90.0 ± 1.9 2.5 rSI (%) - - - 82.7 ± 4.3 ** 75.9 ± 4.6 1.5 rST at early junior age (%) - - - 122.3 ± 2.5 *** 126.7 ± 2.2 -1.9 13 years Age (years) 13.6 ± 0.3 13.7 ± 0.2 -0.4 13.4 ± 0.3 13.6 ± 0.3 -0.7 Swim training (hours per week) 9.8 ± 2.3 8.4 ± 3.1 0.5 9.3 ± 1.4 9.4 ± 2.3 -0.1 Height (cm) 175.4 ± 9.2 176.3 ± 7.0 -0.1 171.2 ± 5.7 * 167.2 ± 5.3 0.8 CMJ (cm) 51.1 ± 2.0 50.3 ± 4.6 0.2 44.6 ± 4.9 42.4 ± 4.3 0.5 rMSV (%) 95.2 ± 3.7 *** 86.6 ± 4.5 2.0 96.1 ± 2.7 ** 92.2 ± 3.1 1.3 rSI (%) 77.9 ± 6.4 * 74.5 ± 4.4 0.6 82.7 ± 4.5 80.7 ± 4.2 0.5 rST at early junior age (%) 123.1 ± 2.2 *** 128.4 ± 3.0 -1.9 119.1 ± 2.6 *** 123.6 ± 2.4 -1.8
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