In cyclical activities, where the same motor structure is repeated, speed is the result of a contradictory relationship between the amplitude or stroke length (distance per cycle) and the frequency or stroke rate (a number of cycles per unit of time). In swimmmg, the swimmer must find the optimal combination of stroke rate and stroke length parameters to reach and maintain the highest possible speed according to the constraints of the task. The swimmers swim more and more quickly, using different combinations of stroke length and stroke rate, which relate to the type of race, the stroke, the gender, the training program and the anthropometric characteristics of the swimmer.
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