The athlete adjusts the blocks to his “traditional” position. Table displaying data for the first three steps. The landing acceleration is similar to ground reaction force (GRF) in this case but measured in units of gravity (g), not Newtons (N).įigure 3 displays this for the first three steps. In addition to the data generated automatically by Plantiga (e.g., peak acceleration, load, and ground contact time asymmetry), other data of relevance would be the push-off and landing accelerations across each step. Plantiga enables you to zoom in or zoom out on this sort of data, allowing for deep, individualized analysis or a basic summary report with essential metrics. In this case, the time recorded was 0.314 seconds. An early first step would indicate a smaller first step, allowing for optimal acceleration rates as the center of gravity remains ahead of the leading foot. This is one of the most important considerations in perfecting the block start. The time to step 1 (point 10) for the left foot back plate position can be measured using the software. Time from rear foot leaving the block to first step.Right foot strike (landing acceleration). To simplify the explanation, the following points relate to the data pictured above: Left foot back plate position, first five steps The Dataįigure 2 shows the raw data collection of just the first five steps of this athlete’s block start with his “left foot back plate.” Plantiga enables you to zoom in or zoom out on this sort of data, allowing for deep, individualized analysis or a basic summary report with essential metrics such as load, peak acceleration, peak velocity, and asymmetry, to name just a few. The athlete struggled technically with this new task, as the Plantiga data showed. The sprinter accelerates from the left foot on the back plate position. Therefore, the rationale was to switch him to a “left foot back plate” position to place the more powerful right limb in the front block and then take advantage of the longer contact time and force-generating ability out of the blocks (see image 2 below). We felt it prudent to take advantage of this by changing the athlete’s starting block position. Note that the top left graph demonstrates a 51.4% greater rate of power development in the first 100 milliseconds of the right leg compared to the left. Force plate data from a single-leg hop test. The athlete has adopted a “right foot back plate” position (see image 1 above) over the last five years however, individualized strength and force plate testing demonstrate more power and concentric force-producing capability in the first 100 milliseconds on the right side (see figure 1 below). This is the position that the athlete had adopted for his starts over the past five years. The sprinter rises to the “set” position with his right foot on the back plate. We undertook a project to improve the first 10 meters of a 10.6-second sprinter using Plantiga to guide our decision-making. You can read more information on Plantiga in a previous article here. Together, we undertook a project to improve the first 10 meters of a 10.6-second sprinter using Plantiga to guide our decision-making. I am fortunate to work alongside one of Australia’s best technical coaches, Scott Rowsell of RAD Squad.
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