CMJS Presentation

Rajan Middar

Malcolm Daniels

Scott Porter

1

Process• Film two different members performing a CMJ

(60sec max)

• Analyze videos using Kinovea

• Complete several assignments using the data

2

HypothesisIf we perform CMJS for one minute then

our jump height will decline as time goes

on

3

•Record 2 different video sets of 1:00 minute max. countermovement jump squats

•Sagital perspective

•Download the videos onto a computer and analyze

Methods of Analysis• Video

• Visual

• Timing

• Data recording

• Photographic

4

Collection Methods• Video replay

• Kinovea

• Microsoft Excel

• Side by side photographic comparisons

5

Camera• IPhone 4s

• 8.00 Megapixels

• Records video with audio, at a rate of 30 frames

per second

6

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

Excel• Spreadsheet program

• Allows for recording of statistics

• Capable of making charts and graph to show

results

8

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

Results - MalcolmJoint Angle

Results - Malcolm

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

Flight Time

Results - Malcolm

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

Jump Height

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: 10812

Results - ScottJoint Angle

Results - Scott

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

Flight Time

Results - Scott

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

Jump Height

Potential Errors• Measuring angles in Kinovea

• Finding exact time for take off

• Finding exact time for flight

15

How to Increase Accuracy• Solid background

• Dark clothes and markers

• Camera with tripod

• Use a guide for jump height

16

Support/Reject Hypothesis

Hypothesis: Does fatigue affect jump height?

According to our findings, fatigue negatively affects

jump height

17

0

0.2

0.4

0.6

0 20 40 60

Hei

gh

t (m

)

Number of Jumps

Jump Height vs Jump Number

Jump Height

Questions?

18