[Age-related characteristics of motor coordination in schoolchildren during dynamic and static work]

An experimental study is conducted in a group of schoolchildren of varying ages with the purpose to establish the interrelations between muscles-antagonists upon performing dynamic and static work, requiring precision of muscular exertion. The methods employed include electromyography and dynamography. The obtained results show that upon performing movements with power-precision characteristics, both in static and dynamic work, the synchronous co-working of the two muscles antagonists proves to be the basic form of action. The electromyographic analysis proves the coordinating role played by the antagonist in the above described pattern of actions. It is furthermore established that in schoolchildren, aged 12-13 and 16-17 years, accomplishment of the motor task is fulfilled more rationally, with less neuromuscular energy expenditure in comparison with 7 to 8-year-old schoolchildren. In addition, after the age 12-13 years, a certain degree of stabilization in some of motor activity parameters takes place, brought on by improvement of motor activity regulation and control.