자연과학편 : 운동선수의 인체분절 모수치와 그 추정식 = Body Segment Parameters and their Prediction Equation in Athletes

다국어 초록 (Multilingual Abstract)

This study was conducted to develop an image processing system to obtain the biomechanical parameters of the human body and its segments using a mathematical model, to determine the segmental and the whole body length, radius, volume, mass center, and moments of inertia with respect to the three principal axes of rotation passing through the center of mass of Korean male athletes, and to establish a reliable means for estimating these parameters from easily measured anthropometric demensions.The model is based on the assumptions that the human body is composed of 16 rigid bodies subdivided into a finite number of elliptical discs and that the segment densities are known. The subjects chosen for this study were 50 male university athletes of 18-22 years of age. Two 35㎜ cameras enabled simultaneous photographs of the body to be made. The optical axes of the cameras were horizontally aligned to provide anterior and lateral views of the body. The photo graphic records were analyzed by reading the image using the scanner, defining the contours and required points of the segments using the mouse, and computing the various segmental and whole body parameters.The model of the human body described in this study was an advancement over previous mathematical models in that a representation of the segments by elliptical disc 5 ㎜ wide followed the shape fluctuation of the body more closely. The image processing system was advantageous in that subject-researcher interaction time and inconvenience to the subject was minial. The accuracy of the method was evaluated by comparing the estimates of total body mass with the mass as measured on weigh scale.The results for the 50 subjects showed an error of 2.09%. The location of the center of mass expressed as percentage of body height from the sole of the feet was found to be at 54.67% in men, The principal moments I_xx and I_yy are approximately of the same magnitude for the upper arm, lower arm, thigh and calf with the principal moment I_zz being approximately 25.4, 25.0, 27.5, and 2% of the I_yy values. The volume, mass, and three principal moments of inertia of the human body and its segments can be predicted from one or more anthropometric dimensions with acceptable levels of accuracy, and the predictive equations established in this study can provide accurate estimates of them for individuals as well as for populations.