In order to analyze a skill such as the golf swing, we have to measure it. To do that we need one or more reference frames, also known as coordinate systems. Reference frames consist of a zero point and three perpendicular axes, usually called, the X, Y and Z axes, which originate from this origin. There is always one global reference frame from which everything else is … [Read more...]
Basic Biomechanics for Golf: Selected Golf Topics
Recently, in the Facebook golf groups there has been a lot of interest in basic biomechanics principles, so I thought I would post this document. I originally wrote it last year for the LPGA to be incorporated as part of their Integrated Performance System. It presents selected topics on basic biomechanics principles for the golf swing. The topic covered … [Read more...]
My PhD Dissertation
I am finally able to publish my PhD dissertation on my website. I have included the abstract, a pdf of the full dissertation and a pdf of the presentation that I made to my committee on June 26 2014, in defense of my dissertation. I actually started my PhD at Arizona State in 1992! I did one year and then started Skill Technologies and then AMM. So life got in the way and … [Read more...]
Pelvis and Thorax Transition plus Spine Rotation
Here is a detailed explanation of the pelvis and thorax kinematic sequence curves from TPI 3D, focused around transition. They display how transition occurs and there is a lot of information that can be gleaned from them. They relate directly to the spine rotation graph also. So for TPI 3D techies here we go. The two above graphs have time in seconds along the X-axis … [Read more...]
When does the Pelvis Begin to Decelerate in the Downswing of Golf?
In order to create maximum speed of a distal segment or implement, the principle of the kinematic sequence (a.k.a kinetic link) shows that each body part, should accelerate then decelerate in a sequential manner. For the golf swing, to achieve maximum club speed, the sequence is pelvis, thorax (ribcage), lead arm, club shaft. This means that during the downswing the pelvis … [Read more...]