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- W2048047105 abstract "Japan Journal of Biomechanics Sports Exercercise; Volume 2 (20):92-98, 1998 Abstract: The purpose of this study was to evaluate the lower limbs motion from the viewpoint of the moment of inertia during running. The moments of inertia of three segments, the thigh, leg, and foot of two runners were calculated in the recovery phase during running. Both of the runners were world record holders of middle distance; one had a high-forward swing form, and the other had a low-forward swing form. The change of the moments of inertia and their influence on angular acceleration, moment, and power for the two runners' hip joints were discussed. The performances of the two runners were videotaped with a video camera operating at 60 Hz with an exposure time of 1/500 or 1/1000 s. Two-dimensional coordinates for determining the moment of inertia were computed by using the direct linear transformation method from video data. The value of moment of inertia about their rotation axis through the great trochanteric head for three segments of the right lower limbs was investigated. In the recovery phase, the low-swing runner had greater rotational inertia than the high-swing runner in three segments of the lower limbs, especially just before the leg landing, when the peak value of the total of the three segments was 23% greater. Affected by the moment of inertia, the lower-swing runner had a greater moment and power of the hip joint but had smaller rotational energy and translational energy in average and peak value. The preceding result explains that for the high swing, because the moment of inertia and moment are small, the leg can be brought forward more quickly; for the low swing the energy cost to bring the leg was smaller. To calculate kinetic data, the body segment parameter is necessary, so the result of moment power and energy of the lower limbs will be easily influenced by the mass and moment of inertia of the leg and foot. That is to say, to choose a swing from a lower limb for a runner, the running speed and running distance, as well as the body proportion, will become important factors in the recovery phase." @default.
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- W2048047105 date "1999-01-01" @default.
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- W2048047105 title "Evaluation of running technique from the viewpoint of moment of inertia" @default.
- W2048047105 doi "https://doi.org/10.1097/00005768-199901000-00032" @default.
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