Structural analysis of the arm stroke kinematics in breaststroke under the conditions of new multipolar device RGD-2

Aim: to perform structural analysis of the arm stroke in breaststroke within the new approach to the aggregate estimate of spatial-temporal and dynamical characteristics. The study was conducted using new device RGD-2 (stroke movement recorder). In comparison with RGD (4) device, the new construction had additional sensors integrated: gyroscope allowing the estimation of the hand position by the pitch and sweep angles; accelerometer recording the hand motion, i.e. along the stroke trajectory front-to-back relative to head-to-foot axis of the swimmer’s body. The comparison of X and Y diagrams with the force factors F suggests the effective use of the sliding hand movements in the water flow that allow the athlete to achieve good supporting reactions. Along the pitch axis there is an impulsive increase of the flow rate with the simultaneous increase of the force pressure in the impulsive mode. As the arm speed at stroke is factor of 3-4 higher than the body movement speed, the loads upon the hand are essentially increased. We performed the structural analysis of the arm stroke in breaststroke within the new approach to the aggregate estimate of spatial-temporal and dynamical characteristics.