INTRODUCTION: With the appearance of the carving ski, alpine and recreation ski turn techniques have changed dramatically. over the past several years. National Ski Method of Japan shows that two important factors caused by carving turn are on-edge angle and skier's loading. The purpose of this study was to suggest effective parameters for comparison of ski movements between experienced and intermediate skiers. METHOD: Six male university skiers (age=20.5±1.2years; weight: 64.0±8.4kg; height: 170.5±4.5cm) participated in this study. All subjects tried 4 parallel turns restricted for middle size turn radius. For the analysis, two turns were made (gate 2 to 3) beginning with a left turn. Four synchronized CCD video cameras were used to record the turns. Three-dimensional coordinate of skier and ski landmarks were calculated by DLT method. In this study, the angle of attack and on-edge angle were calculated by obtaining three-dimensional coordinate data. Angle of attack was calculated by the dot product of velocity vector and longitudinal axes of the skis. On-edge angle was defined as the dot product of vertical vector of skis and vertical vector of slope. Angle of attack evaluates skis' skidding to the side. If this angle is large, turn was considered as "skidding turn," and if the angle is small, the turn was considered as "carving turn." These angles were divided by three phases (total, turn for fall line, and turn from fall line) and calculated mean values. In this study, effect size (ES) was used to estimate of mean value between experienced and intermediate skiers. RESULTS: Angle of attack shows experienced skiers using carving turn technique, but intermediate skiers can't use carving technique (see Fig.1). Table.1 shows effect size of mean values compare between experienced and intermediate skiers. DISCUSSION and CONCLUSION: Obtained data suggests the carving turn was used the angle of attack and the on-edge angle. And more remarkable Parameters are outside ski's angle of attack and on-edge angle at the phase of turn for fall line. To explain these Parameters' difference may lead the progress of skier's carving turn technique.
© Copyright 2007 4th International Congress on Science and Skiing. Julkaistu Tekijä University of Salzburg. Kaikki oikeudet pidätetään. / Kääntänyt https://www.DeepL.com/Translator