160 Chapter 7 Developmental models according to performance level group at late junior age Table 3 shows the developmental models on rSBT, rMSV, rSI and CMJ created for males and females. Each model consists of two age effects, which allows for different rates of development between high- and lower-performing late juniors. The “age” term denotes the development of lower-performing late juniors, whereas “age + age × high-level performance group” denotes the development of high-performing late juniors. To illustrate (using the fixed effects of the model only), the rSBT for a high-performing male late junior swimmer at age 14 will be predicted as follows: Given the study's primary focus on differences between high- and lower-performing swimmers, particular emphasis will be placed on analyzing the interaction term (age × high-level performance group). A significant interaction term would indicate a faster rate of development of high-performing swimmers compared to their lower-performing peers. In males, high-performing late junior swimmers showed significant faster progression over time on rSBT (+11%, p < 0.001), rMSV (+22%, p < 0.001) and rSI (+7%, p < 0.05) compared to lower-performing late junior swimmers (+). In females, high-performing senior swimmers showed significant faster progression over time on rSBT (+12%, p < 0.001) and rMSV (+20% p < 0.01). No significant developmental differences between groups were found on rSI for females and CMJ in males and females (p > 0.05). Figure 3 (males) and Figure 4 (females) reflect the predicted development of high- and lower-performing late juniors during their pubertal years.
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