ISOLATERAL KINETIC INDICES IN THE FIRST SUB MOVEMENT STAGE OF RAPID GOAL-DIRECTED ARM MOVEMENTS

The aim was to explore lateral differences between mechanical energy, power and other kinetic indices in the initial phase of a discrete goal-directed rapid aiming task, based on a speed-accuracy tradeoff. Twenty two young, healthy, right handed males participated in the experiments. Participants were naive to the purpose of the experiment, and none reported any sensory or motor deficits. Left and right arms were tested in separate sessions on the same day. Participants were instructed to move a joystick forward as quickiy and accurately as possible towards a target. A computer program selected only the first sub movement with the greatest acceleratlon and deceleration. Each participant performed 5 series of 10 discrete movements separately with each arm in each Situation (100 movements altogether). Force, acceleration, speed, distance and direction were recorded and impulse of force, relative spatial error, power and energy expenditure were calculated. The results demonstrated that the driving forces, mechanical energy, expenditures and power of motions in the initial sub movement of rapid goal-directed arm movements was generally greater from the left, subdominant arm. In accord with the findings of other authors, these results also suggest that distinct neural control mechanisms are employed for even the initial phase of the action of dominant and non-dominant arm movements.Original Abstract: Cilj je bio istraziti lateralne razlike izmedu mehanicke energije, snage i ostalih kinetickih indeksa u pocetnoj fazi diskretno cilju usmjerene akcije, temeljeno na promjeni brzina-tocnost. Dvadeset dva mlada, zdrava, muskarca desnjaka sudjelovalo je u eksperimentu. Sudionici su bili neiskusni u smislu pokusa, i nitko prijavio bilo senzorne ili motorne deficite. Lijeve i desne ruke su testirane u odvojenim sesijama na isti dan. Sudionici su dobili upute da premjeste joystick prema naprijed sto je brze i tocnije moguce prema cilju. Racunalni program bira samo prvi pod-pokret s najvecim ubrzanjem i usporavanjem. Svaki sudionik izvodio je 5 serija od 10 diskretnih pokreta zasebno s obje ruke u svakoj situaciji (100 pokreta uopce). Snaga, ubrzanje, brzina, udaljenost i smjer zabiljezeni su a impuls sile, relativna prostorna pogreska, snaga i potrosnja energije su izracunati. Rezultati su pokazali da su pokretacke snage, mehanicka energija, rashodi i moc pokreta u pocetnoj fazi pod-kretanja brzih ciljno usmjerenih pokreta desne ruke bili opcenito bolji od lijeve, subdom