2027 Volume 5 Issue 1 Pages 16-20
Objective: The present study aimed to understand the relationship between landing impact sound and shock absorption in single-leg drop jump landing (SLDJL) to develop a simple method for evaluating the shock absorption of jumping movements.
Methods: The subjects included 58 legs of 29 female college basketball players. For SLDJL, the subjects landed on a force plate from a 20 cm step. To measure the impact sound at the time of landing, a sound level meter was placed lateral to the force plate, and the maximum landing impact sound was used as an index. The vertical component of the ground reaction force (vGRF) was measured at a sampling frequency of 1000 Hz. The analysis index was the shock absorption coefficient (loading rate, LR), which is the maximum value of the vGRF divided by time. The measurements were performed thrice on both sides, and 174 such trials were analyzed. Spearman's rank correlation analysis was used to verify the relationship between landing impact sound and LR.
Results: The median values (interquartile range) of landing impact sound and LR were 72.6 (68.8‒76.5) dB and 0.6 (0.5‒0.8) N/ms/kg, respectively. The correlation coefficient (r) between landing impact sound and LR was 0.76 (p<0.01), which indicated a significantly strong positive correlation.
Conclusion: The landing impact sound of SLDJL is related to shock absorption, and the LR can be predicted by evaluating the landing impact sound of SLDJL.
