Cmjs presentation
- 1. CMJS Presentation Rajan Middar Malcolm Daniels Scott Porter 1
- 2. Process • Film two different members performing a CMJ (60sec max) • Analyze videos using Kinovea • Complete several assignments using the data 2
- 3. Hypothesis If we perform CMJS for one minute then our jump height will decline as time goes on •Record 2 different video sets of 1:00 minute max. countermovement jump squats •Sagital perspective •Download the videos onto a computer and analyze 3
- 4. Methods of Analysis • Video • Visual • Timing • Data recording • Photographic 4
- 5. Collection Methods • Video replay • Kinovea • Microsoft Excel • Side by side photographic comparisons 5
- 6. Camera • IPhone 4s • 8.00 Megapixels • Records video with audio, at a rate of 30 frames per second 6
- 7. Kinovea • Is a video player for all sport • Made to slow down and the technique of athletes • Allows users to view two videos side by side and synchronize them at a common time • Allows measuring of distances and times • Provides tracking to follow values or trajectories of athletes 7
- 8. Excel • Spreadsheet program • Allows for recording of statistics • Capable of making charts and graph to show results 8
- 9. Results - Malcolm Joint Angle First 10 accepted jumps: • All but 2 were < or = to 84 Last 10 accepted jumps: • Spikes to 103, 108, & 116 Total average joint angle: 84.8 degrees Min angle: 65 Max Angle: 116 9
- 10. Results - Malcolm Flight Time First 10 accepted jumps: • Roller coasters from 0.4 to 0.6 Last 10 accepted jumps: • Very inconsistent with spikes to 1.14 and 1.02 Total average flight time: 0.5 Min. Flight time: 0.3 Max: 1.14 10
- 11. Results - Malcolm Jump Height First 10 accepted jumps: • Average 0.34 peaks at 0.64 Last 10 accepted jumps: • The average drops to 0.24 (spikes to 1.59 and 1.28) Total average jump height 0.34 Min. Jump height: 0.27 Max: 1.59 11
- 12. Results - Scott Joint Angle First 10 accepted jumps: • 5 measured at 90 Last 10 accepted jumps: • Spikes to 100, 102 & 108 • Only one jump at 90 Total average joint angle: 94.1 degrees Min angle: 80 Max Angle: 108 12
- 13. Results - Scott Flight Time First 10 accepted jumps: • Ranges from .2 - .76 Last 10 accepted jumps: • Ranges from .19-.34 Total average flight time: 0.33 Min. Flight time: 0.1 Max: 0.76 13
- 14. Results - Scott Jump Height First 10 accepted jumps: • Average 0.16 peaks at 0.71 Last 10 accepted jumps: • 6 jumps < 0.09 Total average jump height 0.16 Min. Jump height: 0.01 Max: 0.71 14
- 15. Potential Errors • Measuring angles in Kinovea • Finding exact time for take off • Finding exact time for flight 15
- 16. How to Increase Accuracy • Solid background • Dark clothes and markers • Camera with tripod • Use a guide for jump height 16
- 17. Support/Reject Hypothesis Hypothesis: Does fatigue affect jump height? According to our findings, fatigue negatively affects jump height Jump Height vs Jump Number Jump Height 0.6 Height (m) 0.4 0.2 0 0 20 40 60 Number of Jumps 17
- 18. Questions? 18