Design of a sit ski for the improvement of the competitive ability for LW10.5 athletes

Abstract

This research supports is a sit ski player Nonno Nitta, who is from Sapporo City. And the purpose is her participate in 2018 Winter Paralympics. In order to develop a competitiveness-improvement sit ski for her, this study evaluate her perform when using sit ski with diferent settings. In the laboratory experiments we used a force plate to measure the floor reaction force and a motion capture system to measure the movement speed of the sit ski. And she performs rowing motion with a slope of 3 degrees on the force plate. We evaluated her performance with using different settings by impulse FΔt consist of her motion time Δt and pushing force on the ground. Our previous studies have shown that her performance changes while adjusting the seat surface and the backrest of the sit ski. The rowing motion is so greatly affected. For the adjustment of the sit ski, we prepare the parts made of high rebound mat. The cross section of the adjusting is a triangle shape. Adjusting parts with various angles are prepared and attached to seat surface and backrest. Following facts became clear from the experimental results. The difference in length of the time between she pulls and pushes the stocks affects the floor reaction force. As a result of the improvement, she got results at last year's World Cup and participated in the Pyeongchang Paralympic Games.