caa a22 4500 44535173X CHVBK 20180317142846.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00221-011-2661-8 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2661-8 Time-dependent adaptations to posture and movement characteristics during the development of repetitive reaching induced fatigue [Elektronische Daten] [Jason Fuller, Joyce Fung, Julie Côté] Repetitive movements are common to many daily activities but often lead to the development of fatigue. We have previously shown that fatigue leads to changes in tridimensional spatial characteristics of the whole body. However, temporal aspects of these posture and movement adaptations have yet to be investigated. Healthy subjects (N=14) performed a continuous reaching task by pointing between two targets placed at shoulder height, at 100 and 30% arm's length, anterior to the subject's midline until fatigue (assessed using the Borg CR-10 scale). Whole body kinematics and upper Trapezius EMG were recorded and analyzed at 1-min intervals to document the progression of fatigue on outcome variables. For all upper limb and postural variables analyzed, changes began to occur approximately midway to fatigue and were followed by an increase in Trapezius activity from baseline. Reach-to-reach variability of joint average positions and range of motion (ROM) increased in multiple directions for shoulder and elbow parameters. Reach-to-reach variability of the center-of-mass ROM also increased in several directions. Changes were also observed in within-movement inter-segmental timing. The peak velocities of elbow and endpoint occurred closer together in time during fatigue while the shoulder peak velocity occurrence showed a greater reach-to-reach variability. Our results suggest that the effects of fatigue on repetitive movement kinematics can be observed across three temporal dimensions of the task: (1) within individual movements, (2) from one movement to the next, and (3) as fatigue develops. Each observed change is discussed as a potential contributor to task-specific control strategies to prolong task performance. Springer-Verlag, 2011 Temporal nationallicence Repetitive motion nationallicence Posture nationallicence Coordination nationallicence Movement nationallicence Upper limb nationallicence Fuller Jason Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, H2W 1S4, Montreal, QC, Canada aut Fung Joyce Feil & Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, H7V 1R2, Laval, QC, Canada aut Côté Julie Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, H2W 1S4, Montreal, QC, Canada aut Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 133-143 0014-4819 211:1<133 2011 211 221 https://doi.org/10.1007/s00221-011-2661-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2661-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fuller Jason Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, H2W 1S4, Montreal, QC, Canada aut NATIONALLICENCE 700 1- Fung Joyce Feil & Oberfeld/CRIR Research Centre, Jewish Rehabilitation Hospital, H7V 1R2, Laval, QC, Canada aut NATIONALLICENCE 700 1- Côté Julie Department of Kinesiology and Physical Education, McGill University, 475 Pine Avenue West, H2W 1S4, Montreal, QC, Canada aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 133-143 0014-4819 211:1<133 2011 211 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer