J. V. Hoyos

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This paper presents a new, simple model to evaluate the instrumental random errors in kinematic analysis of human movements using stereophotogrammetry. By means of equations analogous to that relate linear or angular momentum with linear or angular velocities, a direct measurement of instantaneous motion can be made without previous finite displacement(More)
The great diversity of prosthetic mechanisms available nowadays leads to the question of which type of artificial foot would be the most advisable for a particular person. To answer correctly, it is necessary to establish, in an objective way, the performance of each type of prosthetic mechanism. This knowledge is obtained by means of the study of the(More)
The location of the instantaneous screw axis (ISA) is essential in order to obtain useful kinematic models of the human body for applications such as prosthesis and orthoses design or even to help in disease diagnosis techniques. In this paper, dual vectors will be used to represent and operate with kinematic screws with the purpose of locating the(More)
—This paper describes a method for calculating the vectorial kinematic parameters of 3D human movement by stereophotogrammetry, with special emphasis on an accurate characterization of the Instantaneous Helical Axis. That method is applied to the measure of trunk flexion in sitting posture, the results being interpreted in biomechanical terms, and compared(More)
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