METHOD OF ANALYSIS OF SPEED, STROKE RATE AND STROKE DISTANCE IN AQUATIC LOCO-MOTIONS
Keywords: speed, stroke rate, stroke distance, rowing, swimming, canoeing
AbstractA method was developed for assessment of speed (V) and stroke distance (SD) at various stroke rates (R) during aquatic locomotion. The method is based on the equation Fd = k V2, which describes dependence of hydrodynamic drag force Fd on V in water. Equality of the effective mechanical work per stroke (EWS) at various stroke rates was taken as a criterion for assessment. Two equations were developed for calculation of “model” speed Vm = V0 (R1/R0)1/3 and SDm = SD0 (R0/R1)2/3. This method was verified using the data of biomechanical measurements in rowing, when mechanical work per stroke was measured directly. A high correlation was found (r=0.81, p<0.001) between deviations of the actual V and SD values to “models” and deviations of EWS from average. The method can be used in step-test and race analysis in swimming, rowing and canoeing.
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