Iwata, KazuakiMoriwaki, ToshimichiKawano, TsuneoC. E. Vandoni2015-09-292015-09-2919801017-4656https://doi.org/10.2312/eg.19801014The human body motions during standing up and sitting down from/to a chair are analyzed employing a minicomputer system equipped with a graphic tablet and CRT displays. A two-dimensional mathematical model of the human body is developed and its equa-tions of motions are solved to evaluate forces and torques acting at each body joint. The computer graphics are successfully utilized throughout the study in an interactive manner. The effect of aging upon the body motion is also discussed.10.2312/eg.19801014