caa a22 4500 445352779 CHVBK 20180317142849.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00221-011-2875-9 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2875-9 Task-related variations in the surface EMG of the human first dorsal interosseous muscle [Elektronische Daten] [Maureen Whitford, Carl Kukulka] Evidence from human and animal studies suggests that motor neuron pool organization is not uniform for all motor tasks. Groupings of motor units within a muscle may be recruited differentially for a given task based on principles beyond anatomical or architectural features of the muscle alone. This study aimed to determine whether: (1) there was differential activation across locations of the first dorsal interosseous (FDI) muscle during a given task, (2) the differential activation was related to directional requirements and/or end goal of the task, and (3) there was an anatomical pattern to the differential activation. Twenty-six healthy right-handed participants carried out isometric finger/hand contractions in sitting while surface EMG was collected from 4 bipolar sites on the FDI muscle simultaneously. The tasks included: abduction, flexion, diagonal, 30% abduction+30% flexion, 30% flexion+30% abduction, key pinch, and power grasp. Mean peak integrated EMG for each task was normalized to site and task specific mean M waves. Differential activation was evident across FDI sites based on movement direction, order of directional components within a combination condition, and end goal of the task. There was greatest activation in the distal ulnar site for all tasks. Additionally there was a trend toward an ordering effect in the amount of activation at each site: distal ulnar>distal radial>proximal radial>proximal ulnar. Springer-Verlag, 2011 Task group nationallicence Motor neuron pool organization nationallicence Electromyography nationallicence First dorsal interosseous nationallicence Whitford Maureen National Rehabilitation Hospital, Neuroscience Research Center, 102 Irving Street NW, 20010, Washington, DC, USA aut Kukulka Carl University of Minnesota Program in Rehabilitation Science, 428 Church Street SE, 55455, Minneapolis, MN, USA aut Experimental Brain Research Springer-Verlag 215/2(2011-11-01), 101-113 0014-4819 215:2<101 2011 215 221 https://doi.org/10.1007/s00221-011-2875-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2875-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Whitford Maureen National Rehabilitation Hospital, Neuroscience Research Center, 102 Irving Street NW, 20010, Washington, DC, USA aut NATIONALLICENCE 700 1- Kukulka Carl University of Minnesota Program in Rehabilitation Science, 428 Church Street SE, 55455, Minneapolis, MN, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 215/2(2011-11-01), 101-113 0014-4819 215:2<101 2011 215 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer