Unformatted text preview: 111. Center of Gravity Deﬁnition of center of gravity — refer to Lab Manual, page 14-1. For the human body in anatomical position, the CG is approximately 5 cm
anterior to the second sacral vertebra, or 6 cm below the belly button. On
average, it is slightly higher in males than in females — 57% versus 55% of
height. The exact location of the center of gravity varies from person to person
depending on body proportions. The CG is inﬂuenced by changing body position or limb positions. The addition of external weight, such as a backpack, will relocate the CG.
Segmentally each body area contains its own center of gravity. A. Why Is It Useful to Determine CG? 1. Used to describe the movement of the body through space
2. Important for stability 3. It is an important factor in calculation of amount of work done. B. Location of Center of Gravity 1. Reaction board method - used for a static position of the human body.
Assume that the center of gravity is the fulcrum or balance point and then
apply the Principle of Levers. 2. Segmental method - can be used for locating CG of a body in motion. ...
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- Fall '09