In recent years, careless accidents of field workers in situations where hard labor is often placed, such as construction sites, and excessive physical burden associated with work has been regarded as problems. At these civil engineering and construction sites, it is regarded that many accidents and injuries are caused by fatigue. As a method for evaluating fatigue, measurement of heart rate and blood pressure with a smartwatch is generally used, but the measurement of these methods differs greatly depending on individual differences. It is difficult to measure fatigue appropriately. Therefore, in this study, we applied the detection of three-dimensional center of gravity (D3DCG) to bodies under walking conditions. D3DCG calculates the position of the center of gravity of the bodies (C.O.G.) from the frequency of heaving and rolling in walking motions. We conducted experiments of long-distance walking by subjects who differ the distinction of age and sex. The subjects walked in hours on smooth surface and rough surface measuring the motions. Results of calculations by D3DCG showed that there were three different C.O.G.s found in the bodies by which fatigue of walking may be measured. When the fatigue accumulated, each amplitude of the three C.O.G.s changed accordingly to balance the bodies against the fatigue. Degree of the change was quicker on the rough surface than on the smooth surface.
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