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Box Jump
Box Jump
$1.25
Biomechanics
PE 483
Camera & Frames per Phase
Movement Breakdown
Fujifilm 5x wide optical zoom 14 megapixel camera that caught clips at 30 frames per second. Played back and analyzed film on Kinovea.
Figure 6: y axis is frames, x axis is Phases, a visual of the amount of frames per phase.
Angle Measurements
Loading & Take-off Angles
Figure 1: (far left) Beginning of prep phase
Figure 2: (middle left) Beginning of loading phase
Figure 3: (middle) Beginning of action phase
Figure 4: (middle right) Beginning of follow-through phase
Figure 5: (far right) End of box jump movement
Figure 7: (Far left) 112 degrees of knee flexion at the beginning of the loading phase.
Figure 8: (Middle image) 114 degrees of knee flexion at the beginning of the loading phase.
Figure 9: (Far right) 138 degrees of knee flexion at the beginning of the loading phase.
Phases
Figure 10-: (Far left) 76 degrees of leg extension at the beginning of the action phase.
Figure 11: (Middle image) 60 degrees of leg extension at the beginning of the action phase.
Figure 12: (Far right) 74 degrees of leg extension at the beginning of the action phase.
Table 1: The defined beginning and ends of each phase.
Phase
Start Prep Phase
Prep Phase (Loading)
Action Phase (Jumping)
Follow Through (Landing)
Beginning
Beginning of movement
Highest point of arms
Feet leave the ground
Feet touch the box
End
Highest point of arms
Feet leave the ground
feet touch the box
Knees fully extended
Path Tracking
Normal Box Jump
Large Box Jump
Phase
1
2
3
4
28.9%
18.7%
12.6%
39.7%
21.1%
19.7%
13.6%
45.4%
29.8%
20.9%
13.4%
35.8%
Time and Velocity
How to improve the movement?
Change in time (s): 1.00 0.07 0.06 0.10
Avg. Velocity (in/s): 8 114.29 133.33 80
Overall Time: 1.23 s Overall Avg. V: 83.91
Change in time (s): 0.83 0.04 0.03 0.10
Avg. Velocity (in/s): 7.23 150 200 60
Overall Time: 1.00 s Overall Avg. V: 104.31