· The line of gravity passes through the center of mass of the body
· Note
1. center of mass (COM): the weighed average of the center of mass of each body segments
2. center of gravity (COG): the vertical projection of the COM to the ground
3. center of pressure (COP): the point where the resultant of all ground reaction forces act
Plumb line test -- side view
· The plumb line is placed just in front of lateral malleolus or through greater trochanter.
· The individual to be tested is asked to take a few steps in place and then stand still with the feet at approximately the width of the hip joints, the arms relaxed at the side of the body, and the eyes looking forward