Abstract
We aimed to investigate the differences in lower-extremity kinematics during the concentric phases of the single-leg hang power clean (SL-HPC) and the double-leg hang power clean (DL-HPC). Ten male track and field athletes performed SL-HPC and DL-HPC using external loads at 90% of each one-repetition maximum. We used motion capture to record kinematics data for comparison between SL-HPC and DL-HPC, and then normalized the time series data of joint angles to 100% for statistical parametric mapping (SPM) analysis. The results show that the timing of maximum flexion and extension of the joint angles of the lower extremity and the timing of the occurrence of peak joint angular velocity are similar between SL-HPC and DL-HPC. However, the SPM producer showed that the SL-HPC was smaller than the DL-HPC between 87% and 91% of the time series data of ankle joint angle. Similarly, the amount of plantar flexion at the ankle joint indicated that the DL-HPC was greater than the SL-HPC. These results show that the SL-HPC is a weightlifting derivative that partially limits ankle joint extension movements compared to the DL-HPC, but the kinematic characteristics of the lower extremities are generally similar.
