Effets de l'augmentation de la cadence sur le geste du rameur

Abstract

On boat, it is admitted by all that handle's trajectory must be smooth and horizontal during propulsive phase. The objective of this paper is to explore the modifications of the trajectory of the handle and of the gesture of the expert rower for rates from 18 to 40 strokes.min -1 on ergometer Concept II Model C. Last nine experienced rowers took share with the experiments. The movement of the rower and the trajectory of the handle were measured using an motion analysis system of type VICON. The trajectory of the handle is analyzed starting from its principal characteristics: its anteroposterior amplitude, its vertical amplitude and the surface which it describes. The angles of the right knee, the right elbow and the trunk are retained to study the gesture of the rower. The analysis is carried out starting from traditional approaches (angle = F (angle)), but also via a calculation of continuous relative phases (CRP). The results show that, when stroke rate increases, the principal characteristics of the trajectory decrease, the best rower on boat maintains on ergometer the phases of attack and of released, the best rower on ergo-meter produces a trajectory horizontal and smooth, and the best rower on boat modifies primarily his gesture the recovery phase. © 2009 De Boeck Université. All rights reserved.