67 Pacing behavior development in adolescent swimmers 4 Results The models created can be found in Table 2. Using the fixed part of the models, predictions for the dependent variables can be made. For example, for the RST in the 100-150m segment of a 200m event performed by an 18-year-old male swimmer, with 20 previous races and an adult performance level as high-competitive, the following value will be predicted as: Age The predicted effect of age on RST is visualized in Figure 1A (100m) and Figure 2A (200m). Older male swimmers were relatively faster in the first 50m of the 100m. No effect of age was indicated in female 100m swimmers. In the 200m, older male and female swimmers were predicted to start relatively slower, have a relatively faster middle section and a relatively slower final 50m section compared with their younger counterparts. Race experience Race experience significantly impacted RST in all segments except for the final segment in the male 200m event, as visualized in Figure 1B (100m) and Figure 2B (200m). In the 100m, more experienced male and female swimmers were relatively slower in the first half of the race. In the 200m, male swimmers with more race experience were relatively slower in the first 50m section, but faster in the 150m section. More experienced female swimmers were relatively slower in the first 50m section and relatively faster in the 150m and 200m sections. Performance level Elite male swimmers were faster in the first 50m of the 100m, compared to the highcompetitive group. Post hoc analysis revealed that the male swimmers of the elite group started differentiating themselves at 17 years old (t(99.6) = -2.21, p <0.05). No difference was found between female swimmers of differing performance groups. In the 200m, elite male swimmers were predicted to be relatively slower in the first 50m, but faster in the 150m section, compared to swimmers from the high-competitive group. Swimmers from the elite group differentiated themselves as early as 16 years old (RST50: t(51.728)= 3.10, p < 0.01; RST150: t(57.699) = 3.11, p < 0.01). Elite female swimmers were relatively slower in the first 50m section, but faster in the 150m and 200m sections, compared to the high-competitive group. The difference started at 13 years of age (RST50: t(51.07) = 2.36, p < 0.05, RST150: t(77,62) = 4.62, p < 0.001; RST200: t(97,66) = -3.065, p < 0.01). In both the 100m and 200m, the model predicted no significant difference in RST between the elite and sub-elite groups (Figure 1C and Figure 2C).
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