INTRODUCTION: Recently, a very large correlation between radial force (RF), lean angle (LA), and local ski bending curvature (w'') was found for the outer ski when skiing on compact slope conditions (Thorwartl et al., 2022a). The objective of this study is to show whether these relationships also hold for the inner and outer ski and for both soft and compact snow conditions. METHODS: One well-trained skier performed 52 carving turns on compact and soft snow conditions. The w`` of the back (w''_Back) and front segment (w''_Front) of the left ski was measured using a PyzoFlex ® ski prototype (Thorwartl et al., 2022b). Sensor insoles (Moticon GmbH, Munich, Germany) were employed to determine the RF based on the pressure data and the LA using the integrated inertial measurement unit. RF, LA, w''_Back and w''_Front were time normalized over a left-right turn combination. The mean RF (RF*, mean LF (LF*), mean w''_Back (w''_Back*) and mean w''_Front (w''_Front*) were calculated for the first (0 to 25% and 50 to 75%) and second turn phases (25 to 50% and 75 to 100%). Between LA* , RF*, w''_Back*, and w''_Front* the Pearson correlation coefficients (r) were calculated for inner and outer ski and turn phase 1 (r1 ) and turn phase 2 (r2 ), in both soft and compact snow conditions. RESULTS: It was found that on compact snow conditions, predominantly high (r > .5) to very high correlations (r > .7) are observed for the outer ski and low or negative correlations for the inner ski (Fig. 1). In contrast, for soft conditions, the outer ski shows lower correlations between LA* and RF* (r1 = .27, r2 = .42), LA* and w''_Back* (r1 = -.05, r2 = .33) and RF* and w''_Back* (r1 = .63, r2 = .47), but higher positive correlations between LA* and w''_Front* (r1 = .42, r2 = .51) and RF* and w''_Front* (r1 = .82, r2 = .63). DISCUSSION/CONCLUSION: With greater RF and higher LA, mainly the rear segment of the outer ski deforms more, and the w'' of the front segment decreases on compact snow conditions. In soft conditions, the LA and RF of the outer ski correlate with both the w'' of the front and rear ski segments. Regardless of the conditions, no significant relationships were noted for the inner ski. REFERENCES: Thorwartl, C. et al., 2022a. Book of abstracts spinfortec2022 Thorwartl, C. et al., 2022b. Sensors
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