45 Interim performance progression of talented swimmers 3 Defining within-season performance progression (WSPP) The concept of interim performance progression (IPP) is explained as the pattern of performance progression during two consecutive seasons relative to a common reference point. Therefore, the pattern of IPP is described by two phases: phase A and phase B. Phase A is presented as the period between the previous season best rsT and the first swim performance of the current season (first rST). Phase B is presented as the period between the first rST and the current season best rST. So, the first rST is the common reference point in phase A and phase B (see Figure 1). The first rST can be worse, the same or better than the previous season rST. In Figure 1, it is shown as worse. The current season best rST can be the same or better than the first rST. In Figure 1, it is shown as better. Ultimately, the current season best rST can be the worse, the same or better than the previous season best rST. In Figure 1, it is shown as better. Figure 1. The concept of interim performance progression (IPP). The performance progression during phase A (PPA) is defined as the percentage of the first rST relative to the previous season best rST (see equation 2). This measure is constructed to reflect the start level of a swimmer relative to his best swim performance of the previous season. An outcome below the 100% means that the swimmer was faster than his previous season best rST (improved) and an outcome above the 100% means that the swimmer was slower than his previous season best rST (deteriorated). An outcome of 100% means that the swimmer is at the exact same level as his previous season best rST (stabilized).
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