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In- shoe pressure measurement systems are intended to measure the dispersion of load between the foot and the shoe. This is achieved, for example, by using insoles which contain capacitive sensors dispersed over the sole of the foot. Based on the resulting pressure distribution data there is the option to calculate the interacting forces In the present study the accuracy of the calculated forces is detected by means of a comparison with real ground reaction forces. For that it is used the Pedar® system by novel GmbH and a Kistler® force plate. Subject- matter is the deviation of the results measured with both systems depending on several factors, i.e. the surface texture, the number of active sensors in the measurement, the kind of load (static or dynamic) and fit of the Pedar® insoles to the shoe. The latter is analyzed in two ways, first by a comparison between barefoot and shoed measurement to reveal the proportion of error caused by the deformation of the Pedar® insoles in the foot rest, and second by comparing several insole geometries and its influence on the accuracy of the results. Finally, reasons for inexact force measurements are summarized and rated. Moreover, relevant literature regarding the validity of force values calculated by the Pedar® system is discussed and the corresponding data is critically reviewed and compared to the results of the present study. As a result there are clear dependences between accuracy of the measurement system and the hardness of surface as well as the number of activated sensors. Dynamic measurements lead to a better congruity of data because the number of active sensors is less than with static loading. Furthermore the deformation of the Pedar® insoles contains a significant potential for failure. [ABSTRACT FROM AUTHOR]

Coaches use different tools in order to measure the strenght such dynamometers, contact platforms or force plates. Because of that, the control of the training process became a difficult task, commonly the treatment of this information is difficult and the software is not usable enough. This situation became a barrier in the technology application in sport. The coaches need more than measure, they need easy and useful technological tools and scientific updated knowledge, which help and assess them in the training program. The objective of this paper is presenting a technological tool that is able to carry out two tasks: (1) measure explosive; (2) compare the test results of an athlete with his specific sport performance profile; Tool utilities are presented contextualized in soccer. The explosive force is measure by the sport jumps with and without load, such SJ, CMJ, ABK, DJ and RJ. Kinetic variables are measured and analysed. The dymanic maximal force is measured by the most widespread weightlifting exercises, squat and bench press. The maximal power, the power curve and symmetry in force generation of lower and upper limbs are the most important variables presented by this technological application. All those variables are measured by a 3D force plate and kinematic movement analysis system. A data base is included to compare the physical sport state of the athlete analysed with the performance profile of his sport. There is not a similar product in the market, so this tool will help and assess coaches to control several strength manifestation and the training program, in a objective way; using a unique technological tool, integrating tests and variables of analysis, protocols and sport performance profiles database. [ABSTRACT FROM AUTHOR]