リュージュ男子一人乗り種目における国内一流選手のスタート動作の力学的メカニズム

抄録

This study investigated mechanical factors related to performance of the luge start movement and kinetic parameters flowing among limb segments. Using two synchronized video cameras (60fps), the start movements of seven elite male luge athletes were recorded as they participated in an all-Japan luge championship. Joint torque and power were calculated using a DLT technique and bar-reaction force measurements (50Hz). Start time showed a significant correlation (r=0.882, p<0.001) with goal time and Center of mass (CM) velocity at the moment of start bar release (r=0.577, p<0.05). The characteristics of the start movement for the elite group was as followed: In the pulling-back phase, mechanical energy resulting from hip and shoulder joint torque flowed into the lower limbs. At the furthermost pulling-back position, their mechanical energy flowed into the trunk to be supplied to the hip and shoulder extensors as elastic energy. In the luge-moving-forward phase, the mechanical energy of the trunk was pulled into the lower limbs due to extension torque in the hip and shoulder joints at the onset of movement; it flowed to the trunk until just before bar-release position. These results indicate that elastic energy stored in the quick-pulling-back motion may be useful for delivering the forward large CM velocity.