4 69 Pacing behavior development in adolescent swimmers: A large-scale longitudinal data analysis 50-m 100-m Estimates SE CI P Estimates SE CI P Female (100m Freestyle) Fixed Effects Intercept 48.06 0.13 47.80 – 48.31 <0.001 51.94 - - - Agea 0.06 0.05 -0.03 – 0.15 0.215 -0.06 - - - Race experiencea 0.04 0.01 0.02 – 0.05 <0.001 -0.04 - - - Elite vs Sub-elite -0.03 0.03 -0.10 – 0.03 0.331 0.03 - - - Elite vs Highcompetitive -0.05 0.03 -0.10 – 0.01 0.095 0.05 - - - Random Effects σ2 0.17 T00 0.08 ICC 0.33 Marginal R2 / Conditional R2 0.010 / 0.335 50-m 100-m 150-m 200-m Estimates SE CI P Estimates SE CI P Estimates SE CI P Estimates SE CI P Female (200m Freestyle) Fixed Effects Intercept 22.24 0.12 22.01 – 22.46 <0.001 26.02 - - - 27.15 0.08 26.99 – 27.31 <0.001 24.60 0.12 24.36 – 24.84 <0.001 Agea 0.40 0.04 0.32 – 0.49 <0.001 -0.24 - - - -0.47 0.03 -0.52 – -0.41 <0.001 0.30 0.05 0.22 – 0.39 <0.001 Race experiencea 0.06 0.01 0.05 – 0.07 <0.001 -0.00 - - - -0.04 0.00 -0.04 – -0.03 <0.001 -0.02 0.01 -0.04 – -0.01 <0.001 Elite vs Sub-elite -0.01 0.03 -0.07 – 0.04 0.616 -0.02 - - - 0.01 0.02 -0.03 – 0.04 0.719 0.03 0.03 -0.02 – 0.08 0.203 Elite vs Highcompetitive -0.18 0.02 -0.23 – -0.14 <0.001 0.00 - - - 0.11 0.02 0.08 – 0.14 <0.001 0.07 0.02 0.03 – 0.12 0.001 Random Effects σ2 0.09 - 0.05 0.12 T00 0.05 - 0.02 0.03 ICC 0.37 - 0.26 0.21 Marginal R2 / Conditional R2 0.142 / 0.463 - 0.166 / 0.380 0.015 / 0.225 Note. aThe variables age and race experience were log-transformed. The P value of significant predictor variables (α-<-0.05) indicated in bold.
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