115 Tracking talented swimmers during the junior-to-senior transition 6 Measurements Each measurement moment consisted of land-based tests (height assessment and the countermovement jump test), followed by swimming tests. Additionally, swimmers provided their date of birth and reported their weekly training hours dedicated to strength, mobility and swim training using an online questionnaire (see Table 1). Table 1. Descriptive characteristics of male and female swimmers at late junior age (17 and 16 years respectively) according to their performance level at early senior age. Males (N=12) Females (N=17) Highperforming seniors (n=6) Lowerperforming seniors (n=6) Effect sizes Highperforming seniors (n=10) Lowerperforming seniors (n=7) Effect sizes M ± SD M ± SD d M ± SD M ± SD d Age (years) 17.6 ± 0.2 17.6 ± 0.2 0.0 16.5 ± 0.3 16.5 ± 0.3 0.0 Swim training (hours per week) 14.7 ± 2.7 16.7 ± 3.0 -0.7 16.0 ± 2.6 15.0 ± 1.1 0.5 Strength training (hours per week) 2.9 ± 1.5 2.2 ± 0.4 0.7 2.0 ± 0.5 2.8 ± 1.0 -1.1 Mobility training (hours per week) 1.7 ± 0.5 1.9 ± 0.4 -0.4 2.3 ± 0.8 2.0 ± 0.8 0.2 Height (cm) 188.1 ± 8.0 185.7 ± 5.7 0.3 177.4 ± 7.2 172.4 ± 3.9 0.8 rLBP (Watt/kg) 41.0 ± 5.7 35.8 ± 10.0 0.6 32.8 ± 3.0 * 28.0 ± 4.8 1.2 rStart (%) 106.1 ± 5.3 * 114.3 ± 5.2 -1.6 109.9 ± 5.0 110.3 ± 6.8 0.0 rTurn (%) 98.3 ± 3.1 ** 106.1 ± 2.9 -2.6 100.0 ± 4.3 103.4 ± 3.6 -0.8 rSprint (%) 100.8 ± 2.6 *** 93.0 ± 2.0 3.4 100.8 ± 3.6 * 95.1 ± 3.0 1.7 rSI (%) 82.8 ± 11.5 83.0 ± 7.5 0.0 95.1 ± 6.0 * 79.2 ± 10.0 2.0 rST at late junior age (%) 107.4 ± 2.4 ** 114.7 ± 2.9 -2.7 109.1 ± 1.4 * 115.0 ± 3.7 -2.3 rST at early senior age (%) 106.1 ± 1.5 ** 111.8 ± 2.0 -3.3 107.9 ± 1.5 * 114.7 ± 4.2 -2.4 Note. 13 freestyle (6 males); 5 butterfly (1 male); 6 breaststroke (3 males); 5 backstroke (2 males) swimmers. Age refers to the calendar age as of December 31st of the corresponding season. rLBP=relative lower body power; rStart= relative start time; rTurn = relative turn time; rSprint = relative maximal swimming velocity; rSI = relative stroke index; rST = relative swim time. * p < 0.05 (one-tailed); ** p < 0.01 (one-tailed); *** p < 0.001 (one-tailed).
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