Abstract
The flexibility of posture was examined by adjusting one body part to the line of the center of gravity (LCG). Fifteen healthy subjects participated in the experiment and their LCGs were determined with a force plate. The difference between the body part and LCG as recorded by a videocamera before adjustment was compared with that after adjustment. The results obtained were 1) the center of gravity was positioned more anteriorly than is generally believed to be the case, 2) the position of the head was before LCG, and both the shoulder and the knee were behind it, 3) the knee was stable at adjusting one of the other parts of body, and the shifting length of the head and hip were related to the adjusting length of these lower parts, i.e. the head was related to the shoulder and the hip was to the knee. We discussed the young people’s posture, and the stability of the knee to body alignment. In physical training aimed at adjusting posture, it was suggested that the alignment of lower extremities, especially the hip, must be controlled.
