caa a22 4500 445351853 CHVBK 20180317142846.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00221-011-2637-8 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2637-8 Force control deficits in chronic stroke: grip formation and release phases [Elektronische Daten] [Sagar Naik, Carolynn Patten, Neha Lodha, Stephen Coombes, James Cauraugh] The aim of the study was to develop a novel approach for quantifying stair-stepping in a trajectory tracking task with the goal of understanding how age and stroke-related differences in motor control contribute to force control deficits. Nine stroke participants, nine age-matched controls, and nine young healthy adults performed an isometric gripping task while squeezing, holding, and releasing a cylindrical device. The visual tracking task involved three different rates of force production (5, 10, and 20% maximal force/s). Four outcome measures determined force control deficits: (a) root mean square error, (b) standard deviation, (c) step number, and (d) mean pause duration. Our findings indicate that step number, and especially mean pause duration, differentiated force control deficits in the three groups more effectively than the traditional root mean square error. Moreover, stroke participants showed the largest force control deficits during the grip release phase compared to age-matched and young healthy controls. Importantly, step number and mean pause duration quantified stair-stepping while measuring different constructs than root mean square error. Distinct step and duration interruptions in force modulation by persons post-stroke during the grip release phase provide new information with implications for motor recovery during rehabilitation. Springer-Verlag, 2011 Stroke nationallicence Upper extremity nationallicence Force control nationallicence Grip nationallicence Force variability nationallicence Hand nationallicence MVC : Maximal voluntary contraction nationallicence RMSE : Root mean square error nationallicence SD : Standard deviation of force trace nationallicence SEM : Standard error of measurement nationallicence SRD : Smallest real difference nationallicence Naik Sagar Department of Applied Physiology and Kinesiology, University of Florida, 132 C, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut Patten Carolynn Brain Rehabilitation Research Center, Malcolm Randall VA Medical Center, Gainesville, FL, USA aut Lodha Neha Department of Applied Physiology and Kinesiology, University of Florida, 132 C, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut Coombes Stephen Departments of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA aut Cauraugh James Department of Applied Physiology and Kinesiology, University of Florida, 132, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 1-15 0014-4819 211:1<1 2011 211 221 https://doi.org/10.1007/s00221-011-2637-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2637-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Naik Sagar Department of Applied Physiology and Kinesiology, University of Florida, 132 C, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Patten Carolynn Brain Rehabilitation Research Center, Malcolm Randall VA Medical Center, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Lodha Neha Department of Applied Physiology and Kinesiology, University of Florida, 132 C, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut NATIONALLICENCE 700 1- Coombes Stephen Departments of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, IL, USA aut NATIONALLICENCE 700 1- Cauraugh James Department of Applied Physiology and Kinesiology, University of Florida, 132, Motor Behavior Laboratory, 32611, Gainesville, FL, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 1-15 0014-4819 211:1<1 2011 211 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer