INTRODUCTION: The continuous development of wearable sensor technology allows technologies previously used in research settings to be applied for technical analysis of regular training sessions. The aim of this study was to investigate the effect of intensity and rolling resistance on inner-cycle temporal parameters measured by instrumented insoles and poles when roller ski skating. METHODS: Eleven cross-country skiers performed four laps of 2.5 km, alternating between low and high endurance-intensity, while roller ski skating with two different rolling coefficients. Participants were equipped with force insoles and poles with integrated force measurements. The initial and final ground contacts of poles were obtained by using a force-threshold of 5% of bodyweight, and the initial and final contact of skis were determined from the insoles with a threshold of 7% of bodyweight. Inner-cycle temporal parameters were then calculated (e.g., contact and flight time for skis and poles). A decision tree was used to determine the sub-technique employed 1. RESULTS: In total, 13`038 ski cycles and 17`338 poling cycles were detected. Cycle time and inner-cycle durations are presented in Table 1. With higher skiing intensity, pole and ski contact time and ski flight time decreased (all p<0.05), while this was not the case for pole flight time. The rolling coefficient did not significantly affect the inner-cycle durations. DISCUSSION/CONCLUSION: For the sub-techniques used in uphill terrain (G2-G4), changes in rolling coefficient did not affect the inner-cycle parameters. It indicates that manipulation of the rolling coefficient mainly affects speed and the choice of the sub-technique in a given terrain section. With increased skiing intensity, most temporal parameters decreased in association with higher speed and frequency, whereas the pole flight time remained unchanged.
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