150 Chapter 7 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 14 years Age (years) 14.6 ± 0.3 14.6 ± 0.2 -0.2 14.5 ± 0.3 14.6 ± 0.3 -0.5 Swim training (hours per week) 11.7 ± 2.6 10.1 ± 3.3 0.5 11.1 ± 3 10.9 ± 2.8 0.1 Height (cm) 180.6 ± 9.0 180.1 ± 7.2 0.1 174.0 ± 3.2 * 168.8 ± 4.7 1.2 CMJ (cm) 52.5 ± 2.0 51.3 ± 4.8 0.3 46.5 ± 3.6 * 42.7 ± 4.1 1.0 rMSV (%) 97.6 ± 3.1 *** 90.4 ± 3.8 2.0 98.5 ± 2.6 ** 94.2 ± 3.3 1.4 rSI (%) 82.6 ± 7.1 * 78.2 ± 4.2 0.8 86.1 ± 5.4 84.5 ± 2.1 0.5 rST at early junior age (%) 119.5 ± 2.4 *** 124.3 ± 2.3 -2.1 115.6 ± 1.9 *** 120.1 ± 2.2 -2.1 15 years Age (years) 15.7 ± 0.2 15.6 ± 0.2 0.6 - - - Swim training (hours per week) 11.6 ± 3.0 11.3 ± 3.1 0.1 - - - Height (cm) 186.9 ± 3.7 183.4 ± 7.3 0.6 - - - CMJ (cm) 54.4 ± 2.4 52.8 ± 4.5 0.4 - - - rMSV (%) 99.0 ± 2.9 *** 92.5 ± 3.4 2.0 - - - rSI (%) 89.8 ± 6.7 ** 82.3 ± 5.5 1.3 - - - rST at early junior age (%) 115.2 ± 1.7 *** 121.0 ± 1.9 -3.1 - - - Note. 41 freestyle (20 males); 13 butterfly (7 males); 22 breaststroke (13 males); 14 backstroke (7 males) swimmers. Age refers to the calendar age as of December 31st of the corresponding season. CMJ=countermovement jump; rMSV = relative maximal swimming velocity; rSI = relative stroke index; rST = relative swim time. CMJ, rMSV, rSI, and rST at early and late junior age are reported as predicted values instead of observed values.* p < 0.05 (one-tailed); ** p < 0.01 (one-tailed); *** p < 0.001 (one-tailed).
RkJQdWJsaXNoZXIy MTk4NDMw