caa a22 4500 445352426 CHVBK 20180317142848.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00221-011-2790-0 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2790-0 Similarity in the dynamics of contralateral motor overflow through increasing frequency of movement in a single limb [Elektronische Daten] [S. Morrison, S. Hong, K. Newell] This study was designed to investigate the effects of increasing movement frequency of a single limb on the degree of similarity and coherence of the motor outflow in the non-active limb. Twelve young adults performed a series of unilateral hand-clapping tasks (horizontal and vertical in 25-s trials) while seated. Individuals began the movements at a frequency of 1Hz for 5s and were required to increase the movement frequency so as to reach their maximum movement frequency during the latter parts of the trial. Hand and finger kinematics and surface EMG of each arm were recorded. The results showed a progressive emergence of overflow muscle activity and involuntary motion in the non-active arm as the movement frequency of the unilateral action increased toward the upper frequency limits of voluntary movement. This ceiling occurred within the range of 6-7Hz. Activity in the non-active limb emerged as the movement frequency requirements increased, irrespective of the direction of motion for the task (vertical, horizontal), hand used (preferred, non-preferred) or the auditory timing stimulus provided (metronome, no-metronome). The dynamics of the motor overflow in the non-active limb exhibited time- and frequency-dependent patterns similar to those of the active arm. Together, these results demonstrate that the high-frequency unilateral movements of one limb drives the emergence of motor outflow to the opposite limb with the motor output dynamics being produced across both limbs being progressively similar as movement speed increases. Springer-Verlag, 2011 Motor overflow nationallicence EMG nationallicence Coordination nationallicence Movement nationallicence Frequency nationallicence Morrison S. School of Physical Therapy, Old Dominion University, 23529, Norfolk, VA, USA aut Hong S. Department of Kinesiology, Indiana University, Bloomington, IN, USA aut Newell K. Department of Kinesiology, Pennsylvania State University, University Park, PA, USA aut Experimental Brain Research Springer-Verlag 213/4(2011-09-01), 403-414 0014-4819 213:4<403 2011 213 221 https://doi.org/10.1007/s00221-011-2790-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2790-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Morrison S. School of Physical Therapy, Old Dominion University, 23529, Norfolk, VA, USA aut NATIONALLICENCE 700 1- Hong S. Department of Kinesiology, Indiana University, Bloomington, IN, USA aut NATIONALLICENCE 700 1- Newell K. Department of Kinesiology, Pennsylvania State University, University Park, PA, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 213/4(2011-09-01), 403-414 0014-4819 213:4<403 2011 213 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer