Chapter 14: The Center of Gravity and Stability. KINESIOLOGY Scientific Basis of Human Motion, 10 th edition Luttgens & Hamilton Presentation Created by TK Koesterer, Ph.D., ATC Humboldt State University. Objectives.
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Scientific Basis of Human Motion, 10th edition
Luttgens & Hamilton
Presentation Created by
TK Koesterer, Ph.D., ATC
Humboldt State University
1. Define center of gravity, and explain the basis for its location in the human body
2. Estimate the location of the center of gravity of individuals in any position
3. State the principles of equilibrium, and explain and demonstrate applications of each
4. Locate the center of gravity of an individual using either the reaction board or the segmental method
Humans spend most of their time adjusting their positions to the type of equilibrium best suited to the task
a > b > c with respect to lateral stability
Fig 14.9 &
I. Other things being equal, the lower the CG, the greater will be the body’s stability
II. Greater stability is obtained if the base of support is widened in the direction of the line of force
III. For maximum stability the line of gravity should intersect the base of support at a point that will allow the greatest range of movement within the area of the base in the direction of the forces causing motion
IV. Other things being equal, the greater the mass of a body, the greater will be its stability
V. Other things being equal, the most stable position of a vertical segmented body is one in which the CG of each weight-bearing segments lies in a vertical line centered over the base of support
VI. Other things being equal, the greater the friction between the supporting surface and the parts of the body in contact with it, the more stable the body will be
VII. Other things being equal, a person has better balance in locomotion under difficult circumstances when the vision is focused on stationary objects rather than on disturbing stimuli
VIII.There is a positive relationship between one’s physical and emotional state and the ability to maintain balance under difficult circumstances
IX. Regaining equilibrium is based on the same principles as maintaining it.