INTRODUCTION Coordination between propulsive actions of the left and right arms is highly correlated to Stroke Rate SR, Speed V, v fluctuations, and power output (Seifert et al. 2015). Simbana et al. 2020 found that females swimmers had difficulty to follow the imposed SR. The purpose of this case study is to use parametric mapping (SPM) to explore the impact of imposed stroke rate on upper limbs swim cycle kinematics METHODS One female swimmer (24 years, 66 kg, 172 cm, mid distance specialist) participated in this study. She swam nine 25-m trials in a 25-m pool at maximal speed, SR were controlled by a pacing device (Aquapacer). She was equipped with one IMU on each forearm (x-, y-, and z-; to the mediolateral, anteroposterior, and vertical axes). All the data was processed at MATLAB, SPM analyses were implemented with a level of significance set at p . 0.05 RESULTS The minimal SR was 42.51 and maximal 52.8 C.Min-1.The figure 1 show us the mainly differences are observed on the anteroposterior axis and from 40 to 70% at vertical axis, (end of the push and the beginning of return of the arm) DISCUSSION An earlier and faster return of the arms forward is due to the increase in swimming frequency because it is the easiest solution from a motor point of view to reduce cycle time and follow the imposed stroke rate. This SPM may be a new method to analyze the stability and symmetry of the swimming cycle of upper limbs. Figure 1: (SPM) analysis, i.e., t-statistics (SPM{t}), for the acceleration for forearms x,y,z (right vs. left) for all the stroke rates for the swimming cycle (0% entry of the hand and 100% to the entry of the same hand at the next cycle.
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