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

作　　者：Barbara Pellegrini Chiara Zoppirolli Federico Stella Lorenzo Bortolan Hans-Christer Holmberg Federico Schena 

机构地区：[1]CeRiSM(Research Centre of Mountain Sport and Health),University of Verona,Rovereto 38068,Italy [2]Department of Neuroscience,Biomedicine and Movement,University of Verona,Verona 37129,Italy [3]Swedish Winter Sports Research Centre,Department of Health Sciences,Mid Sweden University,Östersund 83125,Sweden [4]School of Kinesiology,University of British Columbia,Vancouver BC V6T 1Z1,Canada [5]Biomechanics Laboratory,Beijing Sport University,Beijing 100084,China

出　　处：《Journal of Sport and Health Science》2022年第1期30-39,共10页运动与健康科学（英文）

摘　　要：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 speed.Methods: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 technique.The 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 determined.Results: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 swing.The 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 

分 类 号：G863.13[文化科学—体育训练]