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Biomechanical analysis of the "running" vs. "conventional" diagonal stride uphill techniques as performed by elite cross-country skiers

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Journal of Sport and Health Science 2022年第1期11卷 30-39页

作者： Barbara Pellegrini Chiara Zoppirolli federico Stella Lorenzo Bortolan Hans-Christer Holmberg federico schena CeRiSM(Research Centre of Mountain Sport and Health) University of VeronaRovereto 38068Italy Department of Neuroscience Biomedicine and MovementUniversity of VeronaVerona 37129Italy Swedish Winter Sports Research Centre Department of Health SciencesMid Sweden UniversityÖstersund 83125Sweden School of Kinesiology University of British ColumbiaVancouver BC V6T 1Z1Canada Biomechanics Laboratory Beijing Sport UniversityBeijing 100084China

Purpose:This study aimed to compare biomechanical aspects of a novel"running"diagonal stride(DSRUN)with"conventional"diagonal stride(DSCONV)skiing techniques performed at high ***:Ten elite Italian male junior cross-country skiers skied on a treadmill at 10 km/h and at a 10°incline utilizing both variants of the diagonal stride *** 3-dimensional kinematics of the body,poles,and roller skis;the force exerted through the poles and foot plantar surfaces;and the angular motion of the leg joints were ***:Compared to DSCONV,DSRUN demonstrated shorter cycle times(1.05±0.05 s vs.0.75±0.03 s(mean±SD),p<0.001)due to a shorter rolling phase(0.40±0.04 s vs.0.09±0.04 s,p<0.001);greater force applied perpendicularly to the roller skis when they had stopped rolling forward(413±190 N vs.890±170 N,p<0.001),with peak force being attained earlier;prolonged knee extension,with a greater range of motion during the roller ski-stop phase(28°±40 vs.16°±3°,p=0.00014);and more pronounced hip and knee flexion during most of the forward leg *** mechanical work performed against friction during rolling was significantly less with DSRUN than with DSCONV(0.04±0.01 J/m/kg vs.0.10±0.02 J/m/kg,p<0.001).Conclusion:Our findings demonstrate that DSRUN is characterize by more rapid propulsion,earlier leg extension,and a greater range of motion of knee joint extension than DSCONV-Further investigations,preferably on snow,should reveal whether DSRUN results in higher acceleration and/or higher peak speed.

关键词： Classical skiing Kinetics Roller skiing

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