Наука и техника (Aug 2014)
KINEMATICS AND DYNAMICS OF EXERCISE PERFORMANCE ON STATIONARY WEIGHT MACHINES
Abstract
The paper is devoted to the topical subject which is related to development of a new technology on interaction of a man and exercise machines while cultivating force characteristics which are important for sports and everyday life as well. The research objective is to determine kinematic and dynamic specific features of articular joint performance when a trainee is interacting with stationary exercise machines while performing power exercises. An original approach for determination and numerical representation of man position based on ascertainment of regularities on changes in joint angles taking into account anatomically possible degree of freedom of locomotor system joints has been used a main method for investigations. Training exercises using typical modern press machines with gravitational, elastic and dissipative forces for loading have been analyzed in the process of investigations. The investigations have revealed that the main problem of stationary exercise systems is an absence of the possibility to create loading simultaneously for several degrees of freedom for joint motions which are characteristic for natural spatial motions of a man. Other problems are connected with strict predeterminacy of human body link trajectories that reduce requirements to coordination of muscle forces, presence of uncontrollable inertial power additives arising at accelerated motion of weights used for loading and necessity to disperse mechanical energy while making exercises.On the basis of the research we have formulated the promising direction for further development of training technologies connected with weight and health-improving training that implies creation of exercise machines providing simultaneous loading with several degrees of freedom for a human locomotor system with minimum inertance and possibility of effective energy dispersion.
