Table 2.  Comparison mean (ąSD) of GRF, loading rate, knee extension moment, and proximal tibia anterior shear force lower extremity during landing between hop-jump and step-close-jump tasks.
 

Hop-jump

Step-close-jump

Peak posterior GRF during landing (BW)

-1.26 (.08)

-.71 (.15) ***

Peak vertical GRF during landing (BW)

1.85 (.23)

1.83 (.17)

Time at which peak vertical GRF occurred following initial
foot contact the with ground (sec)

.07 (.03)

.10 (.03) *

Peak vertical loading rate (BW/sec)

38.3 (25.0)

19.1 (6.0) *

Peak knee extension moment during landing (Nm/BW)

.56 (.10)

.51 (.23)
** and *** denote p < 0.05 and 0.001 respectively