- What is Biomechanics?
- How to calculate Joint and Segment Angles?
- How do I calculate Segment Velocities?
Biomechanics is the study of movement and physics as it applies to biological systems. Using biomechanical principles, you can perform measures and do calculations to analyze bowling technique. You can calculate joint angles and segment velocities. In other words, you can measure the position of your arms and legs, in relation to each other and in relation to the ground. You can calculate how fast your arm swings and the ball speed generated. All these can help you understand your technique, compare your technique to other bowlers, and to identify deficiency areas that you need to improve upon. Below are descriptions of how to perform some basic biomechanical analysis for bowlers. See also a list of Bowling Analysis Software programs which can do a lot of this analysis for you.
An understanding of angles made by your limbs throughout the bowling technique can give you that extra information required when fine tuning your technique. There are many software programs available that will do this for you, or at least make it very easy for you to do.
If you can't afford computer software to do the job for you, fortunately there is a cheap alternative, which can be just as effective. You will need to collect video footage of the bowler. You will also need a few clear plastic sheets (like the ones used for overhead projectors), marker pens and a protractor. Tape the plastic sheets to your TV screen, play the tape and pause it at the appropriate times. With the plastic sheet over the image of the bowler, you can simply draw lines between the points of interest. Move the tape forward, and again draw the lines. Using this technique, you can obtain a good picture of your technique in stick figures. Once you remove the sheet from the screen, you can use the protractor to calculate any angles.
Calculating segment velocities is the next step after calculating joint and segment angles. To do so you need to be able to calculate distance from the video footage. You will also need to know what the frame rate of the video recording is. It may be 25 frames per second, which means that there is 0.04 seconds between each frame. When you view the video frame by frame, and calculate the distance an object moves from one frame to the next, you can calculate the velocity of that object. If the object (e.g. the hand) moves 2 inches between frames, the equates to a velocity of 4.2 feet/sec. Get it? Don't worry as it is not that easy. I will try and simplify all this information in the future as I update this site.