Relationships between the Kinetic and Kinematic Characteristics of Movement and Landing Sound during a Single-leg Landing

Abstract

[Purpose] To clarify the relationships between the kinetic and kinematic characteristics of movement and landing sound during a single-leg landing. [Participants and Methods] Thirteen healthy young adult males were instructed to step off from a 30-cm-high platform, and land on one leg normally (Normal: N) and as quietly as possible (Quiet: Q). The vertical ground reaction force, knee valgus moment, maximum knee flexion angle and value at 40 msec after landing, knee/hip/ankle ranges of motion from start to completion of landing, loading rate, and highest landing sound level when landing under the 2 conditions were measured. [Results] The values representing the landing sound, vertical ground reaction force, peak knee valgus moment, and loading rate were significantly higher, and those representing the maximum knee flexion angle and hip/knee/ankle ranges of motions were significantly lower under the N than Q condition. [Conclusion] The results suggest a correlation between the kinetic and kinematic characteristics of movement and landing sound during a single-leg landing.