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"A mathematical model for predicting the inertial properties of a human body in various positions was developed. Twenty-five standard anthropometric dimensions are used in the model to predict an individual's center of gravity, moments and products of inertia, principal moments, and principal axes. The validity of the model was tested by comparing its predictions with experimental data from 66 subjects. The center of gravity was generally predicted within 0.7 inches and moments of inertia within 10 percent. The principal vertical axis was found to deviate from the longitudinal axis of the body by as much as 50 degrees, depending on the body position assumed. A generalized computer program to calculate the inertial properties of a subject in any body position is presented. The inertial properties of five composite subjects in each of 31 body positions is offered as a design guide. IBM 7094 digital computer programs are appended."--Abstract
It is matter of some surprise that this treasury of information concerning the centres of gravity of various parts of the human body has remained hidden not only from the English speaking world for obvious reasons, but also to some degree from the Ger mans themselves. What is less surprising is t!1at this work is a monument to the renouned German thoroughness as demon strated by the relentless pursuit of data and the meticulous ac curacy of the conclusions. However, these scientific investigations carried out in Leipzig must be viewed in the intellectual climate of the time. In the lat ter half of the nineteenth century, and later, Germany underwent an intellectual explosion. It was the age of Rhumkorff, Max Planck, the Weber brothers and Gottingen University. It was said that science came to life during discussions on the train be tween Gottingen and Berlin. So the scene was set and Braune and Fischer made good use of it and fulfilled their role as mem bers of the Royal Scientific Society of Saxony. When Pauwels (1935) analysed the static and dynamic forces exerted on the hip joint when standing and when walking, he needed data concerning the centres of gravity of the human body and of its different segments. I was faced with the same pre requisite when I studied the forces acting on the knee (1976).
The action of the earth's power of attraction can be imagined as a force from every center of gravity of the body, acting in the direction of a line connecting each center with the center of the earth, and equal to the weight of the mass gathered at the original point. Because of the great distance from these points to the center of the earth, all those lines run parallel to each other. A resultant therefore exists for these forces of inertia. This resultant corresponds to a fixed straight line for every position of the body. This straight line remains unchanged if the body is displaced in space over not too great a distance, while still remaining parallel to itself, but does change its position within the body as soon as the latter is rotated about it. The straight line in the new position intersects the old one at a definite point.
This is the first textbook to comprehensively cover the experimental methods used in biomechanics. Designed for graduate students and researchers studying human biomechanics at the whole-body level, the book introduces readers to the theory behind the primary data collection methods and primary methods of data processing and analysis used in biomechanics. Each individual chapter covers a different aspect of data collection or data processing, presenting an overview of the topic at hand and explaining the math required for understanding the topic. A series of appendices provide the specific math that is required for understanding the chapter contents. Each chapter leads readers through the techniques used for data collection and processing, providing sufficient theoretical background to understand both the how and why of these techniques. Chapters end with a set of review questions, and then a bibliography which is divided into three sections (cited references, specific references, and useful references). Provides a comprehensive and in depth presentation on methods in whole-body human biomechanics; First textbook to cover both collection and processing in a single volume; Appendices provide the math needed for the main chapters.
The contributors to this text explain how to collect, analyse and interpret various forms of biomechanical data. They cover an extensive range of topics including inverse dynamics, dynamometry, electromyography, modelling and simulation.