QUALITY OF PHYSICAL EXERCISES PERFORMANCE BY QUANTITATIVE ASSESSMENT OF RECOVERED MECHANICAL ENERGY

Abstract

In the course of physical exercises, a person performs mechanical work, which is spent on changing the mechanical energy of the body or its parts, i.e., displacement work.

The purpose – is to find the work of movement, which is currently not fully resolved. It is possible to find out to what extent the movement is performed due to the mechanical energy existing in the system, and to what extent – due to the energy of muscle contraction, only experimentally with the involvement of ideas and methods of theoretical mechanics and modern computer technologies.

Methods. For determination of mechanical work and energy during locomotion the following algorithm is offered: to carry out a plane video recording of the physical exercise which is studied; to build a biokinematic scheme of positions of a body of the investigated during performance of the given exercise concerning the external coordinate system, to define its scale and to make a table.

Methodology. The APAS System used, digitization and analysis were carried out according to the methodology of Augulo R.V., Dapena J. and prof. Ariel [1, 5, 6. 7].

Originality. The problem of economization of sports equipment includes the rational use of energy and energy saving. If energy expenditure is measured in different athletes when performing the same motor task, then their values may be sharply different: the same work will be associated with unequal energy expenditure for different athletes.

Results of the study. The efficiency of movement matters, depending on whom we study: high achievement sport; movement efficiency acquires its other meaning in health training, recovery, physical rehabilitation.

The person who moves efficiently is the one who most of all preserves and reuses the full mechanical energy at each moment of time – recuperation.

Conclusions: The coefficient of recovery can vary from 0 to 1. If the coefficient is 0, it means that the theoretical work is approximately equal to the actual work (i.e., no energy is stored in the system). If the coefficient is ≈ 1, it means that there is an out-of-phase change, energy is conserved and reused, i.e., recovery occurs. The physical meaning of the conservation of total mechanical energy is the presence of the transition of one type of energy to another. The meaning of the concept of «transition» is an out-of-phase change of kinetic energy and potential energy. The efficiency of movement is to fully utilize the entire supply of mechanical energy to achieve high sports results. In health training, the concept of effective movement is the opposite: the recovery rate must be high. That is, for people who take care of their health, it is necessary to perform movements in such a way that recovery occurs (mechanical energy is stored and reused).