Video Analysis of a Rugby Punt Instruction Manual Alex, Allison, Duncan, Marcus

Purpose The purpose of the video analysis manual is to educate coaches, teachers, rehab specialist and students on how to set up a video data collection Table of Contents: Equipment Video Collection: Set up, Silicon Coach Critical Measurements: Hip, Knee 1, Knee 2 Conclusion References

Equipment Camera Black Backdrop Lights Computer Net Left: Net, Backdrop, Light Camera Black Backdrop Lights Computer Net Black Tight Clothing Reflective Markers Rugby Ball Measuring Tape Yellow Markers Silicon Coach Right: Camera, Light

Video Collection: Set Up Camera Position The camera position and options were critical to the video collection component. The camera was placed as far from the back drop as possible (8.5m). The camera was then placed on a tripod which gave it stability and a height of (1.4m). The camera must be 90° to the plane of motion (perpendicular). Options The camera’s options were tweaked to maximize quality. The zoom was maximized, blocking out most of the surroundings besides the backdrop. The shutter speed was set to fast. Auto focus was turned off. The frames per second was changed to 300hz to get the best slow motion footage for analysis.

Video Collection: Set Up Lights We used 2 sets of lights. The large lights were positioned under the camera (0.6m away from the camera), and a smaller light positioned closer to the kicker (2.7m to backdrop). The large lights were positioned close to the camera to prevent glares and a bad quality video. The smaller light was added to improve the reflection on the reflective markers on the kicker. Yellow Markers The yellow markers were placed 1 meter apart. The markers are used for scaling the video in accurate measurements.

Video Collection: Set Up Net The net was used to catch the ball after the punt. The net was held up by one person to secure it in position. Clothing The kickers clothing was important to insure a good quality of analysis. Dark tight clothing is ideal for the filming (Underarmor). The dark clothes will contrast the reflective markers making them easy to identify. The tight fit will make sure the reflective markers do not move during the punt.

Video Collection: Silicon Coach Silicon Coach is a program that gives measurements, angles, time stamps, velocities and more of the filmed action. Steps and how to use Silicon Coach: Import video from camera to computer. On Silicon Coach, select template short 1 –explicit Select movie and then select your video, this will convert your video to a .mov file Save the .mov file Then click the last play icon to start the analysis process.

Video Collection: Silicon Coach Before starting any measurements, you want to collaborate the scale of your video. You can do this by going to the icon indicated in the picture and clicking the 2 points that are a meter in width (in our video it was the 2 yellow markers on the floor). By doing this it will make all measurements to scale .

Video Collection: Silicon Coach The next step would be to turn on the time stamp which gives the time during any frame. You can do this by clicking the stopwatch icon indicated in the picture.

Video Collection: Silicon Coach After collaborating the video to scale you can now find the distance between any given points. Select the icon indicated in the picture. Click 2 points on the film and it will give the distance between the 2 given points to scale.

Video Collection: Silicon Coach Too calculate the angle of any given joint first go to the angle icon indicated in the picture. Then you select 3 points or joints and angle will be for the 2nd point clicked. Ex. If you click should, hip, knee, the angle will be for the hip.

Video Collection: Silicon Coach Velocities can be found by clicking on the icon indicated in the picture. Then by clicking a point on the video and then scrolling forward through the video and clicking another point, will give the velocity of the first point and the second.

Critical Measurements: Knee 1 Knee at before contact. This angle was taken as the ankle hit its peak height on the windup. Ball’s (2008) research indicates that the ideal knee angle when the ankles hits its peak height is 64°-69°. Our kicker had a larger knee angle, giving the ankle a lower peak height. Compared to professionals he has a smaller peak ankle height giving him less of a windup and overall less power and velocity. What can he do to fix this? Our kicker could increase peak ankle height by taking a bigger windup,

Critical Measurements: Hip Hip angle at ball contact. The angle of the hip was calculated as soon as the foot came in contact with the ball. Ball (2008) researched professional kickers and found that the hip angle at contact was an average of 154°. Our kicker has a larger hip angle, because he was leaning farther back at contact. Compared to a professional he has less stability and less control, which overall affects the distance. What can he do to fix this? Our kicker could lean forward more when making contact with the ball.

Critical Measurements: Knee 2 Knee angle at contact. The knee angle was taken as soon as the foot came in contact with the ball. Ball (2008) suggest that the knee angle at contact should be around 159°. Our kicker’s knee angle was at 145° at contact. Compared to Bell (2008), our kicker had a almost similar knee angle. The smaller knee angle means that the foot contacted the ball a bit earlier then the professional kickers, this determines at what angle the ball will leave at and overall the distance. What could he do to fix this? He could try and contact the ball sooner.

Conclusion Overall our kicker did not perform to the standard of the professionals in Ball’s (2008) research. Our kicker needed decrease the angle of the knee when the ankle hits its peak height to have a better windup. Our kicker also needed to decrease the hip angle at ball contact, to increase control and stability during the kick. There was not much difference with the knee angle at contact, but preferred he increase the knee angle at contact, which result in contacting the ball at a better height.

References Ball, K. (2008). Biomechanical considerations of distance kicking in Australian Rules football. Sports Biomechanics, 7(1), 10-23. Ball, K. (2010). KICK IMPACT CHARACTERISTICS FOR DIFFERENT RUGBY LEAGUE KICKS. International Symposium On Biomechanics In Sports: Conference Proceedings Archive, 281-4. Silicon Coach (2010-2011) Silicon Coach Support http://www.siliconcoach.com/support/?page_id=405